Search/Recent Changes
DBTropes
...it's like TV Tropes, but LINKED DATA!

Forgotten Phlebotinum

 Forgotten Phlebotinum
type
FeatureClass
 Forgotten Phlebotinum
label
Forgotten Phlebotinum
 Forgotten Phlebotinum
page
ForgottenPhlebotinum
 Forgotten Phlebotinum
comment
Advertisement:propertag.cmd.push(function() { proper_display('tvtropes_mobile_ad_1'); })A situation, most common in Speculative Fiction, where an amazingly useful power or device is revealed in one episode, and would be amazingly useful in later episodes, if it weren't for the fact that nobody seems to remember it. Sometimes the power or device is remembered under circumstances where it proves mostly useless, but not remembered when it would do any good.
This trope does not necessarily denote bad writing. It can be (as noted in the Order of the Stick example) essential to the story. If the protagonists have some piece of phlebotinum that makes them nearly or actually invincible, many plots have to be thrown out the window. Some would call this unwillingness to change the Status Quo and then adapt to the new order of things "lazy", but when one is working on a regular series, changing the status quo, interesting though it can be dramatically, is not something to be done lightly. When it's a Shared Universe this is even more the case.
Advertisement:propertag.cmd.push(function() { proper_display('tvtropes_mobile_ad_2'); })Larry Niven is scornful of this trope, and coined Niven's Law, which states that once a technology or discovery has been introduced into a fictional setting, it must continue to exist in all chronologically later stories in that setting. The secret may be lost for a variety of reasons — society enters a dark age, the discoverer deliberately covers it up, or there really were No Plans, No Prototype, No Backup — but Niven would maintain that this smacks of lazy writing. At the very least, the precedent that such a machine is physically possible in the setting must be maintained, which would make it likely that older, Higher-Tech Species will possess it even if it never became prevalent in the protagonists' society.
Note that this trope is for powers or devices that are forgotten in general. Something which the character does use a lot and only is forgotten this one time is an example of Forgot About His Powers. If the device is remembered, but there's some contrived excuse as to why it isn't available or won't work, that's Holding Back the Phlebotinum or It Only Works Once. Not to be confused with We Have Forgotten the Phlebotinum. If they (finally!) remember to use it in the end, it's a Forgotten Superweapon. When it's not forgotten and is used in a later episode because a writer wants to acknowledge continuity, it is Chekhov's Boomerang. Compare also with Never Recycle Your Schemes in the case of villains.
Advertisement:propertag.cmd.push(function() { proper_display('tvtropes_mobile_ad_3'); })Examples:
 Forgotten Phlebotinum
fetched
2020-07-01T15:12:40Z
 Forgotten Phlebotinum
parsed
2020-07-01T15:12:40Z
 Forgotten Phlebotinum
processingComment
Dropped link to Aesoptinum: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to AllYourPowersCombined: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to AppliedPhlebotinum: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to Averted: Not an Item - UNKNOWN
 Forgotten Phlebotinum
processingComment
Dropped link to AvertedTrope: Not an Item - IGNORE
 Forgotten Phlebotinum
processingComment
Dropped link to BigBad: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to BrownNote: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to BuiltWithLEGO: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to ClassyCatBurglar: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to DealWithTheDevil: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to DeusExMachina: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to DistancedFromCurrentEvents: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to EyeBeams: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to FoodPills: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to HandWave: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to HeroInsurance: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to HoldingBackThePhlebotinum: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to InvokedTrope: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to LeaveYourQuestTest: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to MakeWrongWhatOnceWentRight: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to MindProbe: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to MsRedInk: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to MyLittlePony: Not an Item - UNKNOWN
 Forgotten Phlebotinum
processingComment
Dropped link to NegativeSpaceWedgie: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to NoPlansNoPrototypeNoBackup: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to PhysicalGod: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to PowerOfTheSun: Not an Item - UNKNOWN
 Forgotten Phlebotinum
processingComment
Dropped link to SFDebris: Not an Item - CAT
 Forgotten Phlebotinum
processingComment
Dropped link to SoLastSeason: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to SuperSpeed: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to TechnoBabble: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to TheHero: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to TheVirus: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to TimeTravel: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to TimeyWimeyBall: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to TrueLovesKiss: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to TwoPartEpisode: Not an Item - UNKNOWN
 Forgotten Phlebotinum
processingComment
Dropped link to WaveMotionGun: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to WeirdnessMagnet: Not an Item - FEATURE
 Forgotten Phlebotinum
processingComment
Dropped link to WhatHappenedToTheMouse: Not an Item - FEATURE
 Forgotten Phlebotinum
processingUnknown
Averted
 Forgotten Phlebotinum
processingUnknown
PowerOfTheSun
 Forgotten Phlebotinum
processingUnknown
TwoPartEpisode
 Forgotten Phlebotinum
processingUnknown
MyLittlePony
 Forgotten Phlebotinum
isPartOf
DBTropes
 Forgotten Phlebotinum / int_13d2e7c3
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_13d2e7c3
comment
The 1950s The Adventures of Superman:
In an episode, Superman learns from a swami (or somesuch) how to divide himself into two by using the power of his Super-will. It was only used once. Each is only half as powerful as the full Superman so it makes sense for him not to use it all the time; but it would have come in very handy during all of those "you never see Clark and Superman at the same time" bits.
Another episode has him develop the power to walk through walls without smashing through them by brute force and doing major property damage. Like the splitting power, gets forgotten from then on. (The same thing happens on Lois & Clark four decades later.)
 Forgotten Phlebotinum / int_13d2e7c3
featureApplicability
1.0
 Forgotten Phlebotinum / int_13d2e7c3
featureConfidence
1.0
 The Adventures of Superman
hasFeature
Forgotten Phlebotinum / int_13d2e7c3
 Forgotten Phlebotinum / int_14d341dc
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_14d341dc
comment
The Star Trek Online mission "House Pegh" has the eponymous Klingon black-ops team in possession of a wide-area cloaking device capable of hiding ships in formation from Iconian sensors. Surely this is a brilliant advance that will change the course of the war! (Nope, never mentioned again, which amazingly is one of the lesser reasons the mission is considered an Idiot Plot.)
 Forgotten Phlebotinum / int_14d341dc
featureApplicability
1.0
 Forgotten Phlebotinum / int_14d341dc
featureConfidence
1.0
 Star Trek Online (Video Game)
hasFeature
Forgotten Phlebotinum / int_14d341dc
 Forgotten Phlebotinum / int_1a9f8821
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_1a9f8821
comment
Happens again in Mega Man Battle Network. The current theory is that software updates render the battlechips used in the series from the previous update useless, which is why Lan starts with the same folder full of junk every game.
 Forgotten Phlebotinum / int_1a9f8821
featureApplicability
1.0
 Forgotten Phlebotinum / int_1a9f8821
featureConfidence
1.0
 Mega Man Battle Network (Video Game)
hasFeature
Forgotten Phlebotinum / int_1a9f8821
 Forgotten Phlebotinum / int_1beda93b
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_1beda93b
comment
In Sluggy Freelance, an early Story Arc had Riff and Dr. Schlock work together to build a time machine. After the machine is destroyed by a potato chip (it was balloon based), neither of them ever tries building one again, despite Time Travel having more Deus ex Machina potential than anything else. Though considering how much trouble they get into dealing with Alternate Dimensions and how big a mess they caused with the last time-travel jaunt, even Riff would hesitate to use it.
 Forgotten Phlebotinum / int_1beda93b
featureApplicability
1.0
 Forgotten Phlebotinum / int_1beda93b
featureConfidence
1.0
 Sluggy Freelance (Webcomic)
hasFeature
Forgotten Phlebotinum / int_1beda93b
 Forgotten Phlebotinum / int_1dedf61a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_1dedf61a
comment
Space Ghost Coast to Coast. The episode "Snatch" has a segment that is pseudo-satirical of this trope. Although the device in that case is a mind erasing device, so at least it is feasible that the device is never remembered.
 Forgotten Phlebotinum / int_1dedf61a
featureApplicability
1.0
 Forgotten Phlebotinum / int_1dedf61a
featureConfidence
1.0
 Space Ghost Coast to Coast
hasFeature
Forgotten Phlebotinum / int_1dedf61a
 Forgotten Phlebotinum / int_21795cc3
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_21795cc3
comment
Lex Luthor invents teleporters, time machines, cloaking devices, a gizmo that sucks the Green Lantern Ring off its wearer's finger, etc., etc. ... uses them once ... and then then never uses them again, even in situations where one of them would save the Legion of Doom's bacon.
 Forgotten Phlebotinum / int_21795cc3
featureApplicability
1.0
 Forgotten Phlebotinum / int_21795cc3
featureConfidence
1.0
 Lex Luthor (Comic Book)
hasFeature
Forgotten Phlebotinum / int_21795cc3
 Forgotten Phlebotinum / int_21938c93
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_21938c93
comment
In Avengers: Age of Ultron, Helen Cho has built a "regeneration cradle" that can heal grievous injuries by creating synthetic tissue and bonding it to the victim's cells. Apparently, nobody thought to use this on War Machine after a serious fall cost him the use of his legs in Captain America: Civil War. Heck, the movie even has a scene where doctors are shown examining him after the accident, and Helen isn't even mentioned. Justifiable, considering that there seems to only be one cradle, which was severely damaged in Ultron, when Vision awakened and exploded out of it violently enough to knock Thor across the room.
Speaking of healing in the MCU, Iron Man 3 prominently features Extremis, which can heal almost any injury short of decapitation or a headshot. It has the minor drawback that it might make you spontaneously explode, but Tony fixes that issue at the end of the movie, and uses it to remove the shrapnel from his chest. It is never referenced again, even when it could be used to heal Rhodey in Civil War, and he doesn't seem to have any kind of healing factor in any of the other movies.
 Forgotten Phlebotinum / int_21938c93
featureApplicability
1.0
 Forgotten Phlebotinum / int_21938c93
featureConfidence
1.0
 Avengers: Age of Ultron
hasFeature
Forgotten Phlebotinum / int_21938c93
 Forgotten Phlebotinum / int_21d1578d
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_21d1578d
comment
This is not uncommon in Doraemon. There are several predicaments that Doraemon and co. face that one of his gadgets that have been mentioned in previous episodes could have easily get them out but for some reason Doraemon seems to have to use the gadget that was introduced in episode they were in. One the early gadgets of the week (chapter 54, "Lies Become Truths") was a beak-like toy which one could wear, and anything uttered while using it will be spontaneously proven as fact. Nobita lied that his father can shatter a huge rock with his bare hand, and then he can do it with ease. Quite frankly this should have make any other gadget Doraemon had introduced, or will ever introduce, completely and utterly obsolete. It was never mentioned again ever since. Particularly frustrating in Doraemon feature films and volume-length comics, which featured life-threatening situations.
 Forgotten Phlebotinum / int_21d1578d
featureApplicability
1.0
 Forgotten Phlebotinum / int_21d1578d
featureConfidence
1.0
 Doraemon
hasFeature
Forgotten Phlebotinum / int_21d1578d
 Forgotten Phlebotinum / int_2212773a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2212773a
comment
Similar to the flamethrower instance from Angel mentioned above, in a Season 2 episode Buffy kills a random mook vampire by shoving a burning torch/brazier against its chest, which causes it to go up in flames like it was made of straw soaked in gasoline. Given how the series occasionally spiced up vampire-killing up with decapitation or holy water, it's a small wonder fire didn't come up more.
 Forgotten Phlebotinum / int_2212773a
featureApplicability
1.0
 Forgotten Phlebotinum / int_2212773a
featureConfidence
1.0
 Angel
hasFeature
Forgotten Phlebotinum / int_2212773a
 Forgotten Phlebotinum / int_227431b6
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_227431b6
comment
At the end of Volume 2 of Runaways, the team gets their hands on a device that allows them to travel through time. It is never mentioned again, even though it might come in handy after Xavin is taken prisoner by the Light Brigade and carried off into space in Volume 3.
 Forgotten Phlebotinum / int_227431b6
featureApplicability
1.0
 Forgotten Phlebotinum / int_227431b6
featureConfidence
1.0
 Runaways (Comic Book)
hasFeature
Forgotten Phlebotinum / int_227431b6
 Forgotten Phlebotinum / int_24e813c
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_24e813c
comment
In Starlancer, a big part of the storyline is the development of portable warp drives for fighters and capital ships that allow them to zip around the Solar System with ease and without detection. Cut to Freelancer, taking place 800-900 years later, and that technology is nowhere to be found. Yes, there are cruise engines (basically, really powerful afterburners) and starlanes, but those are limited, and ships using them can be detected and intercepted. Heck, even the intro shows the Coalition fleet making a Dynamic Entry by warping in and immediately opening fire on the surprised Alliance ships.
 Forgotten Phlebotinum / int_24e813c
featureApplicability
1.0
 Forgotten Phlebotinum / int_24e813c
featureConfidence
1.0
 Starlancer (Video Game)
hasFeature
Forgotten Phlebotinum / int_24e813c
 Forgotten Phlebotinum / int_261c8d3f
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_261c8d3f
comment
The Simpsons:
The Season 2 episode "Simpson and Delilah" reveals a new drug, Dimoxinil, which is shown to immediately cure baldness and grow a thick mane of hair just overnight. Homer uses it, becomes promoted and heavily respected at work, but loses the hair and his respect after Bart accidentally spills the Dimoxinil. After this episode, it is never seen or mentioned again, despite the fact that such a product would change the medical landscape due to actually curing all baldness. Homer is seen caring about his baldness in future episodes, despite the fact that baldness should be a thing of the past in that universe now. It was supposed to have been lost to Homer because of its expense ($1000 for a 6 month supply, which Homer almost got in trouble for paying with his insurance), but given how immediately it improved his career, you'd think he'd invest in more (especially when later episodes show him as wasting larger amount of money on less useful things).
The Season 3 episode "Brother, Can You Spare Two Dimes?" saw Homer's half-brother Herbert invent a device that translated baby-talk into intelligible English phrases. During the episode, this actually allows Maggie to stop being the voiceless and actually interact with the rest of the cast. The device is never mentioned again, which is surprising from a show that frequently lampshades its own reliance on Status Quo Is God.
Season 6's "Grampa vs. Sexual Inadequacy" had Grandpa Simpson make a aphrodisiac tonic which helps Homer and Marge's sex-life, which they start selling to the rest of Springfield. That tonic sure would've helped in later episodes where Homer and Marge's sex-life was struggling, e.g. season 9's "Natural Born Kissers".
 Forgotten Phlebotinum / int_261c8d3f
featureApplicability
1.0
 Forgotten Phlebotinum / int_261c8d3f
featureConfidence
1.0
 The Simpsons
hasFeature
Forgotten Phlebotinum / int_261c8d3f
 Forgotten Phlebotinum / int_266bbb13
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_266bbb13
comment
Kvothe from The Name of the Wind learns a mental technique called Heart of Stone, which eliminates the user's emotional response and lets them "sit at the funeral of their sister and feel nothing". He then doesn't use it ever in the following three years he spends trying to cope with emotional trauma while living on the streets.
 Forgotten Phlebotinum / int_266bbb13
featureApplicability
1.0
 Forgotten Phlebotinum / int_266bbb13
featureConfidence
1.0
 The Name of the Wind
hasFeature
Forgotten Phlebotinum / int_266bbb13
 Forgotten Phlebotinum / int_2675c915
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2675c915
comment
Agents of S.H.I.E.L.D.: In the pilot, Fitz and Simmons create a special version of the I.C.E.R. that fires out of a sniper rifle. The weapon proves exceptionally effective, allowing Ward to subdue the superpowered Villain of the Week without ever having to get close enough for the villain to use his powers against him. In fact, he never even realized Ward was there! Unfortunately, nobody ever seems to remember this when they need to non-lethally subdue threats in future episodes. While the I.C.E.R. itself becomes part of S.H.I.E.L.D.'s regular arsenal, they're all handguns, which have considerably less range and leave the user much more vulnerable.
 Forgotten Phlebotinum / int_2675c915
featureApplicability
1.0
 Forgotten Phlebotinum / int_2675c915
featureConfidence
1.0
 Agents of S.H.I.E.L.D.
hasFeature
Forgotten Phlebotinum / int_2675c915
 Forgotten Phlebotinum / int_27777760
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_27777760
comment
In Eureka, the cryo sleep chamber that was used to put Fargo's grandfather in suspended animation could have been used many times to buy time during emergencies where people are mutating or dying of some horrible disease.
 Forgotten Phlebotinum / int_27777760
featureApplicability
1.0
 Forgotten Phlebotinum / int_27777760
featureConfidence
1.0
 Eureka
hasFeature
Forgotten Phlebotinum / int_27777760
 Forgotten Phlebotinum / int_2819aebd
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2819aebd
comment
One of the most notorious parts of Mega Man (Classic) lore: what happens to the weapons he obtains from the Robot Masters? In every game, he receives several invaluable weapons and tools, but by the time Dr. Wily threatens the world for what feels like the hundredth time, Mega Man has discarded them. Among other amazing weapons, you'd think he'd keep something like the Ice Slashernote A Mega Man weapon capable of freezing enemies, even suspending them in mid-air., Atomic Firenote A Mega Man 2 weapon, and likely the most powerful (and energy-consuming) fire weapon in the Classic series when fully charged., Metal Bladenote Also from Mega Man 2, and arguably one of the most useful weapons in the entire series. Could be considered a Game-Breaker, as it can be used over 100 times before running out of energy, fired in any direction and is effective against numerous bosses and enemies., or the Flash Stoppernote A Mega Man 4 weapon that emits light so bright most robots' circuits seize up briefly. It's similar to Mega Man 2's Time Stopper, but while that actually stopped time, Mega Man couldn't shoot while it was in effect, unlike the Flash Stopper. on hand for when Wily predictably reappears, but no. Especially groan-worthy when you realize that he sometimes has to obtain these weapons for the second, third, fourth, or (rarely) FIFTH time in later games (such as the arcade and Game Boy titles). Some adaptations (such as the Archie Comics series) try to Hand Wave this.
Also extends to other games in the franchise, such as the X series. Here, it's even worse as Mega Man X loses entire suits of his own powerful upgraded armor. But could be justified given the personality of the protagonist and that it was shown he usually disposes of the armors after the crisis.
Surprisingly averted in Mega Man Legends, where the Bag of Spilling causing Mega Man to lose all his good gear from the first game is justified at the beginning of the second game: Roll had to sell off all his gear to afford to repair their ship back to top condition.
Happens again in Mega Man Battle Network. The current theory is that software updates render the battlechips used in the series from the previous update useless, which is why Lan starts with the same folder full of junk every game.
 Forgotten Phlebotinum / int_2819aebd
featureApplicability
-1.0
 Forgotten Phlebotinum / int_2819aebd
featureConfidence
1.0
 Mega Man (Classic) (Video Game)
hasFeature
Forgotten Phlebotinum / int_2819aebd
 Forgotten Phlebotinum / int_28508de
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_28508de
comment
Winx Club:
A segment of a season 3 episode opens with Icy boasting about a new fire power Valtor gave her. In the Trix's battles against the Winx, including the one just a few minutes later, she doesn't use it (and in fact, it's Darcy who sets a library on fire in a later episode, not Icy). And during the battle in the same episode, Layla sneaks up behind Darcy and Stormy to tie them up, even though way back in the second ever episode, she sensed Bloom's presence behind a garbage can, even though Bloom was well out of her view. (However, the non-4K version does mitigate the stupidity in both cases somewhat.)
A season 1 episode saw Icy destroy Red Fountain by freezing it with a nifty ice dragon. Season finale, Icy doesn't even make any effort to use it to freeze Alfea, or to take on Bloom, who has an fire-energy dragon of her own.
Bloom was shown to be able to use her powers to revive the dead. It's not explained why Nabu is still dead. This was changed to breaking a sleeping spell in the 4kids version, which removes the contention entirely.
In early season 3 there's nothing stopping a blind Layla from waiting to use Queen Ligea's healing staff the next sunset after she uses it on its owner.
The Charmix from season 2. Sure, it was So Last Season, but there's nothing else preventing the fairies who hadn't earned their Enchantix from using it in season 3, especially like when they're battling the Trix. Yet the only time it's even mentioned in season 3 is when the school headmistress talks about Enchantix.
In the 21st episode of the third season, Nabu claimed that the reason he had stowed away on the Specialists ship was so he could practice his invisibility spells against monsters living in the area the Winx were travelling to. Nabu's ability to turn invisible hasn't been seen again since this episode. (Although it's possible that he used this ability off-screen during season 4's episode 20 when he went to the nature fairy Diana's castle to try to save the Specialists, but this is just a theory...)
 Forgotten Phlebotinum / int_28508de
featureApplicability
1.0
 Forgotten Phlebotinum / int_28508de
featureConfidence
1.0
 Winx Club
hasFeature
Forgotten Phlebotinum / int_28508de
 Forgotten Phlebotinum / int_2af4f467
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2af4f467
comment
G.I. Joe: A Real American Hero was particularly bad about this. C.O.B.R.A. would develop a new superweapon, and the new superweapon would be destroyed by the G.I. Joe team. Just imagine if C.O.B.R.A. were to use more than one of the same weapon at the same time, or if it were to use several different superweapons at the same time.
 Forgotten Phlebotinum / int_2af4f467
featureApplicability
1.0
 Forgotten Phlebotinum / int_2af4f467
featureConfidence
1.0
 G.I. Joe: A Real American Hero
hasFeature
Forgotten Phlebotinum / int_2af4f467
 Forgotten Phlebotinum / int_2b00412
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2b00412
comment
Shows up in one of the many Avengers stories (the relaunch with Kurt Busiek). Justice, sidelined with a broken leg, goes on an Archive Binge and realizes that the best way to defeat an Adamantium robot on a homicidal rampage is with Antarctic (type B) Vibranium (AKA Anti-Metal), a metal that somehow destroys any other metal within range when exposed to the air. Fortunately, the Avengers destroyed an AIM base with stocks of type B vibranium four or five issues previously; but in all the long history of Ultron's rampages, some of the finest minds (Stark, Pym et al) in the world never linked the "really tough metal" and "destroys metal on contact" dots together.
 Forgotten Phlebotinum / int_2b00412
featureApplicability
1.0
 Forgotten Phlebotinum / int_2b00412
featureConfidence
1.0
 The Avengers (Comic Book)
hasFeature
Forgotten Phlebotinum / int_2b00412
 Forgotten Phlebotinum / int_2bb4ae0f
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2bb4ae0f
comment
Claire's blood in Heroes. It can heal people. It works on anything, and nobody even mentions it in situations where it might be useful (for instance, on Nathan at the end of season 3). Her blood had previously restored her adoptive father to life. A shame he didn't mention this when her biological father needed it, and her grandmother was frantic to preserve him. Even stupider, her grandmother should have already known about it because of Adam.
 Forgotten Phlebotinum / int_2bb4ae0f
featureApplicability
1.0
 Forgotten Phlebotinum / int_2bb4ae0f
featureConfidence
1.0
 Heroes
hasFeature
Forgotten Phlebotinum / int_2bb4ae0f
 Forgotten Phlebotinum / int_2d316ba2
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2d316ba2
comment
Teenage Mutant Ninja Turtles (2003): In the Fast Forward season, the Turtles and Splinter are stranded a hundred years in the future with no way of returning to their own time... not one mention is made of their time-traveling friend Renet, who is supposed to keep an eye on the time stream and would almost certainly have noticed if the Turtles were suddenly in a different time period than they were supposed to. Then again, it could be the Turtles and Splinter were supposed to spend some time in the future.
 Forgotten Phlebotinum / int_2d316ba2
featureApplicability
1.0
 Forgotten Phlebotinum / int_2d316ba2
featureConfidence
1.0
 Teenage Mutant Ninja Turtles (2003)
hasFeature
Forgotten Phlebotinum / int_2d316ba2
 Forgotten Phlebotinum / int_2e45b03b
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2e45b03b
comment
In "The Two Brothers", collected by The Brothers Grimm, the twin brothers accidentally acquire a magical ability to make gold appear from nowhere, which leads to them being run out of town at the instigation of the man who'd been attempting to acquire the ability for himself. In the course of their many subsequent adventures, the ability is never mentioned again.
 Forgotten Phlebotinum / int_2e45b03b
featureApplicability
1.0
 Forgotten Phlebotinum / int_2e45b03b
featureConfidence
1.0
 The Two Brothers
hasFeature
Forgotten Phlebotinum / int_2e45b03b
 Forgotten Phlebotinum / int_2e639137
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2e639137
comment
Cyclops, during a plan to infiltrate Magneto's band by disguising himself as Erik the Red, creates a pair of gloves that somehow allow him to fire his optic blasts out of his hands instead of just his eyes, which he uses to devastating effect for the duration. While the identity of Erik the Red itself is used by several other characters, these gloves are never used by Cyclops again despite the incredible effectiveness it showed, the much greater versatility it could have afforded him, and the fact that it would have finally allow him to have another option during the numerous times he's had his optic blasts blocked for one reason or another.
 Forgotten Phlebotinum / int_2e639137
featureApplicability
1.0
 Forgotten Phlebotinum / int_2e639137
featureConfidence
1.0
 Cyclops / Comicbook
hasFeature
Forgotten Phlebotinum / int_2e639137
 Forgotten Phlebotinum / int_2f427f2d
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2f427f2d
comment
Additionally, in the play Harry Potter and the Cursed Child, it is revealed that the Time Turner *can* alter the past, as the villain is nearly successful at using one to bring back Lord Voldemort.
 Forgotten Phlebotinum / int_2f427f2d
featureApplicability
1.0
 Forgotten Phlebotinum / int_2f427f2d
featureConfidence
1.0
 Harry Potter and the Cursed Child (Theatre)
hasFeature
Forgotten Phlebotinum / int_2f427f2d
 Forgotten Phlebotinum / int_2fee008d
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_2fee008d
comment
Tengen Toppa Gurren Lagann: The Gurren Lagann is equipped with a powerful Deflector Shield, which stops Combat Pragmatist enemies from attacking it in the middle of its formation, as well as stopping any powerful attacks thrown at it. It only appears in episode 3 and is promptly forgotten for the rest of the series, where it could have been very useful. (It reappears in the Compilation Movie, however.)
 Forgotten Phlebotinum / int_2fee008d
featureApplicability
1.0
 Forgotten Phlebotinum / int_2fee008d
featureConfidence
1.0
 Tengen Toppa Gurren Lagann
hasFeature
Forgotten Phlebotinum / int_2fee008d
 Forgotten Phlebotinum / int_32c541e6
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_32c541e6
comment
In Fullmetal Alchemist, Dr. Marcoh reveals he has developed a way to destroy Philosopher's Stones, and uses it to great effect against Envy. Yet neither Marcoh never uses it again.
 Forgotten Phlebotinum / int_32c541e6
featureApplicability
1.0
 Forgotten Phlebotinum / int_32c541e6
featureConfidence
1.0
 Fullmetal Alchemist (Manga)
hasFeature
Forgotten Phlebotinum / int_32c541e6
 Forgotten Phlebotinum / int_331e009
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_331e009
comment
Borderlands 2 has a standard-fare New-U (TM) Respawn system. For the most part, it's ignored; all characters are killed off for real within the game's plot... with the sole exception of the "Kill Yourself" sidequest, in which the player must use the New-U to collect their reward. The game's developers regretted this so much that DLC New-U machines would sometimes say "This respawn is not canon" when resurrecting the player.
 Forgotten Phlebotinum / int_331e009
featureApplicability
1.0
 Forgotten Phlebotinum / int_331e009
featureConfidence
1.0
 Borderlands 2 (Video Game)
hasFeature
Forgotten Phlebotinum / int_331e009
 Forgotten Phlebotinum / int_353b7af3
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_353b7af3
comment
They came up with a holographic communications array, installed it on the Defiant's bridge and Sisko's office, used it all of three times and forgot all about it. Other than looking cool and saving some money on blue-screen usage, it really served no purpose at all.note This was eventually retconned in Star Trek: Discovery as having existed even before TOS days. It was removed from the Enterprise both because it interfered with her older systems and because Pike just plain didn't like how it made everyone look like ghosts. It's possible the rest of Starfleet soon gave up on the tech and went back to the good old screens.
 Forgotten Phlebotinum / int_353b7af3
featureApplicability
1.0
 Forgotten Phlebotinum / int_353b7af3
featureConfidence
1.0
 Star Trek: Discovery
hasFeature
Forgotten Phlebotinum / int_353b7af3
 Forgotten Phlebotinum / int_3ac36a5c
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_3ac36a5c
comment
Transformers: Generation 1 had both sides constantly creating weapons that would be a Game-Breaker in the hands of non-idiots. Instead of being used for what they could be, they'd be used to create/stop the problem of the day, and then never be seen or heard from again. Also, the many, many, many one-shot powers displayed by individual Autobots that would never be used again. (Most iconically, the Pure Energy flail and axe used by Megs and Prime, respectively, in the series premiere only and never again.) They also suffered from No Plans, No Prototype, No Backup: If the ultimate weapon whipped up in the days since the previous episode gets smashed at the end, just making another is apparently never an option.
 Forgotten Phlebotinum / int_3ac36a5c
featureApplicability
1.0
 Forgotten Phlebotinum / int_3ac36a5c
featureConfidence
1.0
 Transformers: Generation 1 (Franchise)
hasFeature
Forgotten Phlebotinum / int_3ac36a5c
 Forgotten Phlebotinum / int_3b34143f
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_3b34143f
comment
Harry Potter:
Averted in Harry Potter and the Prisoner of Azkaban. The Time Turner is, with only one exception, solely used by Hermione to take multiple classes at the same time. However, the perception of this as forgotten phlebotinum is a common fandom mistake: the Time Turner follows the Stable Time Loop model of Time Travel (you can't actually change the past, only participate in it from a different perspective) and only works in half-hour increments, which isn't that useful.
It would still be immensely useful for spying, though - had Umbridge or the Inquisitorial Squad possessed one in Order of the Phoenix, Dumbledore's Army probably wouldn't have lasted a day. Indeed, it's probably for this reason that Rowling had the entire stock destroyed during the climactic battle in Phoenix, just as the series was accruing more and more Spy Fiction elements.
Additionally, in the play Harry Potter and the Cursed Child, it is revealed that the Time Turner *can* alter the past, as the villain is nearly successful at using one to bring back Lord Voldemort.
The same book also introduces the magical Marauder's Map, which shows the location and name of every person inside the Hogwarts grounds, and was created by James Potter and his friends. Despite being one of the most useful items in the series, and created by a bunch of teenagers, no similar map is ever seen to be used by anyone else.
Sirius' two-way mirror, which is a magical walkie-talkie. In Harry's defense, he was never told exactly what it was, and swore never to use it for fear it would cause Sirius to come to Hogwarts and get arrested and/or killed. It still qualifies as forgotten phlebotinum, however, because even after Harry has gone through great risk to speak to Sirius through Umbridge's fire, it didn't occur to Sirius to tell him "Next time, use the mirror I gave you." which would have saved his life.
In Harry Potter and the Half-Blood Prince, the potion 'Felix felices' is introduced- an incredibly powerful good luck potion. It's very rare, and has negative long term effects, but you've got to be a little bit surprised that neither side thought to brew up some for any of the really big/dangerous stuff.
Cracked wondered wondered why innocent people like Hagrid and Sirius Black had to go to jail in a world with truth potions and mind-reading spells.
 Forgotten Phlebotinum / int_3b34143f
featureApplicability
-1.0
 Forgotten Phlebotinum / int_3b34143f
featureConfidence
1.0
 Harry Potter
hasFeature
Forgotten Phlebotinum / int_3b34143f
 Forgotten Phlebotinum / int_3ddddb25
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_3ddddb25
comment
Xiaolin Showdown
The Shard of Lightning can freeze time, and Jack used it to steal most of the monks' Shen Gong Wu, and cause various havoc. The monks won it by the end of the episode, but never use it again.
The Golden Tiger Claws, which allow a person to create a portal to any location. It's introduced and done away with in Season 1, but returned to the heroes in Season 2. Despite that Dojo can sense the location of any newly active Wu, the heroes never decide to have Dojo use the Claws to warp there, instead of flying there slowly enough to let the villains reach the Wu.
The Emperor Scorpion, a Shen Gong Wu that can control any other Shen Gong Wu. After being used to defeat four Mala Mala Jongs (giant demons made of Shen Gong Wu) at once, it is sealed away in the vault. Neither the monks, nor the villains (who raid the vault every six episodes or so) ever take or use this supreme Shen Gong Wu ever again, presumably because it would make the show very boring.
In "The Black Vipers", Jack is seen flying away after being deceived into losing a bag full of Shen Gong Wu. You can see the Glove of Jisaku on his hand as he flies away. The Glove of Jisaku has the power to attract other objects - even other Shen Gong Wu. He even used it to steal a bunch of Wu at once in an earlier episode. Yet he doesn't use it here.
 Forgotten Phlebotinum / int_3ddddb25
featureApplicability
1.0
 Forgotten Phlebotinum / int_3ddddb25
featureConfidence
1.0
 Xiaolin Showdown
hasFeature
Forgotten Phlebotinum / int_3ddddb25
 Forgotten Phlebotinum / int_3e06fe95
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_3e06fe95
comment
Birdman. The title hero can only recharge his solar powers in sunlight. This means that in almost every episode (exceptions: "The Menace of Dr. Millenium", "The Deadly Duplicator" and "Versus the Speed Demon") he runs out of power, is captured by the villain and he has to re-expose himself to the sun's rays to regain his powers. In episode 20 "The Wings of Fear" he develops "Solar Energy Storage Bands", which provide him with solar energy to replenish his powers when he's out of the sunlight. After this episode they're never mentioned again, even though they would have been incredibly useful.
 Forgotten Phlebotinum / int_3e06fe95
featureApplicability
1.0
 Forgotten Phlebotinum / int_3e06fe95
featureConfidence
1.0
 Birdman
hasFeature
Forgotten Phlebotinum / int_3e06fe95
 Forgotten Phlebotinum / int_3f445492
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_3f445492
comment
Arabian Nights: In the tale of the three princes who each go to seek a marvel, Prince Ahmed finds a magic apple that restores health to anybody who smells it, even if they are at the point of death, and presents it to his father the Sultan. This tale has a sequel, in which the Sultan's advisors poison his mind against Prince Ahmed and persuade him to send Ahmed on a series of impossible quests; one of these is for a MacGuffin reputed to cure all diseases — and not one person, not even Prince Ahmed who gave it to him, thinks to mention that he's already got one.
 Forgotten Phlebotinum / int_3f445492
featureApplicability
1.0
 Forgotten Phlebotinum / int_3f445492
featureConfidence
1.0
 Arabian Nights
hasFeature
Forgotten Phlebotinum / int_3f445492
 Forgotten Phlebotinum / int_3f633fb4
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_3f633fb4
comment
Cracked wondered wondered why innocent people like Hagrid and Sirius Black had to go to jail in a world with truth potions and mind-reading spells.
 Forgotten Phlebotinum / int_3f633fb4
featureApplicability
1.0
 Forgotten Phlebotinum / int_3f633fb4
featureConfidence
1.0
 Cracked (Website)
hasFeature
Forgotten Phlebotinum / int_3f633fb4
 Forgotten Phlebotinum / int_43576f5
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_43576f5
comment
Supernatural
The Colt. Sam and Dean spend the first part of season 5 trying to recover it, only to discover that it doesn't work on Lucifer. They never use it again, despite how it would still work on lots of the other things they fight (Lucifer says he's one of only four beings in existence it can't kill, Michael and God presumably among them). They do use it when they travel back in time to kill a phoenix in season 6, though, so it's not completely forgotten. Forgetting it is justified in at least some cases since there are knives that can kill angels and demons as well, but what about the Leviathans?
In "Holy Terror", Sam is possessed by an angel, and Dean needs a way to get it out. Kevin comes up with a ritual that will temporarily give Sam control, allowing him to expel the angel. This doesn't work, but not due to any problem with the spell -The angel merely found out about it beforehand and sabotaged the ritual. One episode later, in "Road Trip", Dean and Castiel capture the angel, still in Sam's body, and need a way to expel him. The only idea they can come up with is a deal with Crowley, that he enters Sam's mind and explains the situation to him in exchange for his own freedom. Except, now that the angel can't interfere, there was nothing stopping the original -and much safer- plan from working. So you've got to wonder why they didn't just do that instead.
 Forgotten Phlebotinum / int_43576f5
featureApplicability
1.0
 Forgotten Phlebotinum / int_43576f5
featureConfidence
1.0
 Supernatural
hasFeature
Forgotten Phlebotinum / int_43576f5
 Forgotten Phlebotinum / int_43a9c333
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_43a9c333
comment
In Cowboy Bebop, the crew seems to conveniently forget that they have a nigh-omnipotent hacker on board who could take over other ships at will in her initial appearance but never, ever does that again, even though that would not exactly be the least effective way to catch their bounties. It was particularly bad in the episode where the villains are immobilizing ships through a computer virus. Gee, if only they had someone on board who could counter that...
 Forgotten Phlebotinum / int_43a9c333
featureApplicability
1.0
 Forgotten Phlebotinum / int_43a9c333
featureConfidence
1.0
 Cowboy Bebop
hasFeature
Forgotten Phlebotinum / int_43a9c333
 Forgotten Phlebotinum / int_44127c7c
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_44127c7c
comment
Power Rangers:
Ever since Disney took over the franchise, teams have been getting single special abilities while untransformed. Except in Ninja Storm and Jungle Fury, where these powers were highly plot important, the Rangers would generally completely forget they had these powers for a dozen episodes at a time.
In the original Mighty Morphin' Power Rangers, this happened far more frequently, with MacGuffins being introduced regularly and never being mentioned again. The worst was the Sword of Power, summoned by a brainwashed Tommy as part of a ploy by Lord Zedd to steal it. After regaining his mind, Tommy goes to great lengths to get it back, taking on the Monster of the Week single-handedly. He retrieves it... and it's never seen again. For that matter, it wasn't clear why it was so desirable in the first place. Honorable mention also goes to the Thunder Slingers. Tommy and Jason spend an entire episode working together to get them, and then after one battle they're never used again.
The So Last Season nature of the franchise causes a few instances of this in the first few series. Notably, both the Zeo Crystal and the Zeo Zord fleet from Power Rangers Zeo survived the end of that particular show, but nobody ever thinks to use these again after the Rangers lose their Turbo powers and Zords at the end of Power Rangers Turbo.
 Forgotten Phlebotinum / int_44127c7c
featureApplicability
1.0
 Forgotten Phlebotinum / int_44127c7c
featureConfidence
1.0
 Power Rangers (Franchise)
hasFeature
Forgotten Phlebotinum / int_44127c7c
 Forgotten Phlebotinum / int_467c89f7
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_467c89f7
comment
In Super Dimension Fortress Macross, we see that the Humongous Mecha piloted by humans have head-mounted cannons - that got used exactly four times during the entire show. Only twice as a weapon - both of the other times they were used as cutting tools.
Thankfully, the head cannons see more consistent use in later Macross series.
 Forgotten Phlebotinum / int_467c89f7
featureApplicability
1.0
 Forgotten Phlebotinum / int_467c89f7
featureConfidence
1.0
 Super Dimension Fortress Macross
hasFeature
Forgotten Phlebotinum / int_467c89f7
 Forgotten Phlebotinum / int_49ad83ee
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_49ad83ee
comment
World of Warcraft could be said to have this. When questing it is not uncommon to be given an incredibly powerful item to help with the quest, for example a crystal that can fire a beam to shrink down giants, making them much easier to fight, to never be used again. This has caused many an Obvious Rule Patch over the life of the game to keep players from abandoning the quests to keep the items.
 Forgotten Phlebotinum / int_49ad83ee
featureApplicability
1.0
 Forgotten Phlebotinum / int_49ad83ee
featureConfidence
1.0
 World of Warcraft (Video Game)
hasFeature
Forgotten Phlebotinum / int_49ad83ee
 Forgotten Phlebotinum / int_4b790c7b
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_4b790c7b
comment
Speaking of healing in the MCU, Iron Man 3 prominently features Extremis, which can heal almost any injury short of decapitation or a headshot. It has the minor drawback that it might make you spontaneously explode, but Tony fixes that issue at the end of the movie, and uses it to remove the shrapnel from his chest. It is never referenced again, even when it could be used to heal Rhodey in Civil War, and he doesn't seem to have any kind of healing factor in any of the other movies.
 Forgotten Phlebotinum / int_4b790c7b
featureApplicability
1.0
 Forgotten Phlebotinum / int_4b790c7b
featureConfidence
1.0
 Iron Man 3
hasFeature
Forgotten Phlebotinum / int_4b790c7b
 Forgotten Phlebotinum / int_4be3aedd
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_4be3aedd
comment
In the original Mighty Morphin' Power Rangers, this happened far more frequently, with MacGuffins being introduced regularly and never being mentioned again. The worst was the Sword of Power, summoned by a brainwashed Tommy as part of a ploy by Lord Zedd to steal it. After regaining his mind, Tommy goes to great lengths to get it back, taking on the Monster of the Week single-handedly. He retrieves it... and it's never seen again. For that matter, it wasn't clear why it was so desirable in the first place. Honorable mention also goes to the Thunder Slingers. Tommy and Jason spend an entire episode working together to get them, and then after one battle they're never used again.
 Forgotten Phlebotinum / int_4be3aedd
featureApplicability
1.0
 Forgotten Phlebotinum / int_4be3aedd
featureConfidence
1.0
 Mighty Morphin' Power Rangers
hasFeature
Forgotten Phlebotinum / int_4be3aedd
 Forgotten Phlebotinum / int_4dd54482
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_4dd54482
comment
Ben 10: Alien Force:
Kevin's powers are even more limited, as he can only absorb the properties of solid matter. This limits his options in combat into turning into something tough like metal or stone, then running around punching stuff. It's eventually explained that Kevin could still absorb energy, but chose not to because it makes him go insane.
The DNAliens are all infected humans, but Ben finds out the Omnitrix is capable of curing the people and is able to help Gwen's brother this way. He then proceeds to forget that he can do this until the Season Finale.
 Forgotten Phlebotinum / int_4dd54482
featureApplicability
1.0
 Forgotten Phlebotinum / int_4dd54482
featureConfidence
1.0
 Ben 10: Alien Force
hasFeature
Forgotten Phlebotinum / int_4dd54482
 Forgotten Phlebotinum / int_4e45b093
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_4e45b093
comment
The Big Bang Theory has a rare non-F&SF example: Sheldon can be persuaded to do some things he finds ridiculous or inexplicable by telling him that the thing is a "non-optional social convention". Not only does it work, but he immediately accepts it without argument. This has been used a grand total of once in the show's history.
 Forgotten Phlebotinum / int_4e45b093
featureApplicability
1.0
 Forgotten Phlebotinum / int_4e45b093
featureConfidence
1.0
 The Big Bang Theory
hasFeature
Forgotten Phlebotinum / int_4e45b093
 Forgotten Phlebotinum / int_4fd9904a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_4fd9904a
comment
It would still be immensely useful for spying, though - had Umbridge or the Inquisitorial Squad possessed one in Order of the Phoenix, Dumbledore's Army probably wouldn't have lasted a day. Indeed, it's probably for this reason that Rowling had the entire stock destroyed during the climactic battle in Phoenix, just as the series was accruing more and more Spy Fiction elements.
 Forgotten Phlebotinum / int_4fd9904a
featureApplicability
1.0
 Forgotten Phlebotinum / int_4fd9904a
featureConfidence
1.0
 Harry Potter and the Order of the Phoenix
hasFeature
Forgotten Phlebotinum / int_4fd9904a
 Forgotten Phlebotinum / int_50e2e357
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_50e2e357
comment
In Star Trek (2009), the Spock from an alternate future introduces "transwarp transporting", which works across interstellar distances. He shows this to the younger version of Scotty, and uses it to send him and Kirk to the Enterprise, which is currently traveling at warp speed. In Star Trek Into Darkness, Harrison uses it to beam from Earth to the Klingon homeworld Qo'noS. This demonstrates that knowledge of the technology did leak out, but is now exclusively used by the villains, with the heroes seemingly no longer remembering how to do it, even though they were the first to learn how it works.
 Forgotten Phlebotinum / int_50e2e357
featureApplicability
1.0
 Forgotten Phlebotinum / int_50e2e357
featureConfidence
1.0
 Star Trek (2009)
hasFeature
Forgotten Phlebotinum / int_50e2e357
 Forgotten Phlebotinum / int_55c5a085
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_55c5a085
comment
Mazinger Z: Often it was played straight. Many times Dr. Hell came up with a Mechanical Beast equipped with a weapon put Kouji or Mazinger-Z in a serious disadvantage: Gromazen R9 shot an acid could melt Aphrodite A's armor (that was made of Japanium, although it was less tough than Mazinger Z's), Kingdan X10 projected mirages, Holzon V3 set earthquakes off, Jinray S1 flew at Match 5, Aeros B2 could absorb Mazinger's attacks and hurling them back, Desma A1 caused hallucinations, Gumbina M5 was nearly invulnerable... and they were not used again. However, sometimes Dr. Hell reused and improved some strategies or weapons, or deceived the enemy in believing he was using the same trick.
 Forgotten Phlebotinum / int_55c5a085
featureApplicability
1.0
 Forgotten Phlebotinum / int_55c5a085
featureConfidence
1.0
 Mazinger Z
hasFeature
Forgotten Phlebotinum / int_55c5a085
 Forgotten Phlebotinum / int_5755b96a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_5755b96a
comment
The Order of the Stick:
When preparing to face Xykon for the first time, Durkon enchants Roy's sword with an anti-undead spell, which could have destroyed Xykon completely with one shot if Roy managed to land a hit. That spell would probably have come in handy the next time they face Xykon, but nobody thinks to mention it.
The Giant, the author of said webcomic, specifically said that he prefers to do things that way. Taken directly from his FAQ, "Q: In Strip #X, why didn't character Y take action Z? If they had done so, they could have avoided a whole lot of trouble. A: You just answered your own question. The strip is about the trouble these characters get in; if a tactic would result in an effortless solution to their latest problem, there would be little point in showing it, see?"
 Forgotten Phlebotinum / int_5755b96a
featureApplicability
1.0
 Forgotten Phlebotinum / int_5755b96a
featureConfidence
1.0
 The Order of the Stick (Webcomic)
hasFeature
Forgotten Phlebotinum / int_5755b96a
 Forgotten Phlebotinum / int_57f80079
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_57f80079
comment
The Alliance Rune in The Mortal Instruments. After City of Glass it's never used again, even when Shadowhunters and Downworlders are going into battle right next to each other.
 Forgotten Phlebotinum / int_57f80079
featureApplicability
1.0
 Forgotten Phlebotinum / int_57f80079
featureConfidence
1.0
 The Mortal Instruments
hasFeature
Forgotten Phlebotinum / int_57f80079
 Forgotten Phlebotinum / int_59303db8
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_59303db8
comment
A Certain Scientific Railgun: There are a few things that only come up in the spinoff once or twice before being discarded.
The Level Upper program, for example, is a noise file that increases a listener's power level before putting them in a coma, in which state they can be used as an organic computer for the controller of the network to make use of all their powers. Despite its obvious use to the more ruthless elements of Academy City, it has only been brought up again once, when Gensei Kihara makes use of a small esper network during the Daihaseisai arc. The smaller size of Gensei's network also appears to avoid one of the bigger issues with the original, that is, the creation of the AIM Burst.
"Capacity Down" is a Brown Note in that causes immense physical and mental distress in espers, leading them to collapse and unable to use their powers. This is used once in Railgun by a non-esper villain against the esper heroes. Academy City has AIM Jammers that can similarly be used to supress espers, but they are limited to being static security measures for esper prisons and other important places, while Capacity Down's mobility advantage is never used beyond the arc that introduced it.
 Forgotten Phlebotinum / int_59303db8
featureApplicability
1.0
 Forgotten Phlebotinum / int_59303db8
featureConfidence
1.0
 A Certain Scientific Railgun (Manga)
hasFeature
Forgotten Phlebotinum / int_59303db8
 Forgotten Phlebotinum / int_5bc3983e
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_5bc3983e
comment
In The Nightmare Before Christmas: Zero's Journey, Lock, Shock, and Barrel don't bring their walking bathtub, despite that their ulterior motive to go to Christmas Town was to steal candy and toys while searching for Zero.
 Forgotten Phlebotinum / int_5bc3983e
featureApplicability
1.0
 Forgotten Phlebotinum / int_5bc3983e
featureConfidence
1.0
 The Nightmare Before Christmas: Zero's Journey (Manga)
hasFeature
Forgotten Phlebotinum / int_5bc3983e
 Forgotten Phlebotinum / int_5c600b17
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_5c600b17
comment
In Digimon Adventure, there were several instances in which Gomamon's Marching Fishes technique could have come in handy, especially since he was seen in the first episode carrying the entire group down a river on the fishes.
 Forgotten Phlebotinum / int_5c600b17
featureApplicability
1.0
 Forgotten Phlebotinum / int_5c600b17
featureConfidence
1.0
 Digimon Adventure
hasFeature
Forgotten Phlebotinum / int_5c600b17
 Forgotten Phlebotinum / int_5ca2f3f9
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_5ca2f3f9
comment
Wizards of Waverly Place
In the movie, a bad wish of Alex's ruins her parents marriage. Too bad they didn't learn a spell that allows them to reverse time to correct such mistakes, like they were taught during an episode of the series. This spell would have been very useful in the fight between Juliet and Mason to keep both characters from getting permanently transformed once Mason scratched Juliet.
The improv spell, which does anything as long as you can make up a rhyme for it. Although, the wizards lessons pretty much disappear after that one. Presumably, all the spells afterward were the improv spell, with a few exceptions.
 Forgotten Phlebotinum / int_5ca2f3f9
featureApplicability
1.0
 Forgotten Phlebotinum / int_5ca2f3f9
featureConfidence
1.0
 WizardsOfWaverlyPlace
hasFeature
Forgotten Phlebotinum / int_5ca2f3f9
 Forgotten Phlebotinum / int_5d354f8
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_5d354f8
comment
Red Dwarf is a major offender. By the end of the seventh season, the crew had access to, among other things: An inter-dimensional transporter, a virus which brings dreams to life, a portal leading to Red Dwarf, pre-radiation incident, a batch of developing fluid which allows one to enter any photo and alter time from that point, a matter transporting paddle, a DNA reconstituter, a triplicator, a virus which bestows incredible luck, and nanomachines which seem to be able to create almost anything (up to and including planets and sentient life forms). None of these items are ever used or even referenced more than once (Except the luck virus, which becomes a Chekhov's Boomerang in Season 8). But worst of all, in a show where the entire plot conceit is a crew stranded in deep space, trying to get home, the Dwarfers find a fully functional time drive which allows them to travel anywhere in the universe, at any point in time. And yes, they can and do use it to go to Earth. More than once. Somehow, this doesn't end the show.
 Forgotten Phlebotinum / int_5d354f8
featureApplicability
1.0
 Forgotten Phlebotinum / int_5d354f8
featureConfidence
1.0
 Red Dwarf
hasFeature
Forgotten Phlebotinum / int_5d354f8
 Forgotten Phlebotinum / int_5e81679c
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_5e81679c
comment
The Grey Griffins books forget their phlebotinum all the frigging time. All the time. Other times they hold it back. Max can sense portals and enter them... wait, now he can't, except when he suddenly needs to warp into one much later. Max has a pet "spriggan" that he cares deeply about. Where'd it go, and how come neither Max nor the book cares? You get the idea. Contributes to the randomness of the plot.
 Forgotten Phlebotinum / int_5e81679c
featureApplicability
1.0
 Forgotten Phlebotinum / int_5e81679c
featureConfidence
1.0
 GreyGriffins
hasFeature
Forgotten Phlebotinum / int_5e81679c
 Forgotten Phlebotinum / int_605dd875
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_605dd875
comment
Stargate:
Stargate SG-1 usually avoids this, with plenty of Chekhovs Boomerangs shown years apart, but it still has its examples.
Kull Warrior Armor. That stuff shrugs off claymore explosions, and is light enough to wear, yet while Vala is able to get her hands on a suit and capture a starship — a United States starship, no less, so you'd think they learn — with it, the US military doesn't even seem interested in it. Plus it looks really badass.
Season 3, "Past and Present": They discover a drug that reverses the effects of aging. Next episode, it's forgotten.
Stargate Atlantis:
By the end of the series, Atlantis is on Earth. Atlantis. The Ancient city-ship with sensors that are capable of picking up even cloaked ships in practically one third of the galaxy away from wherever it happens to be. The database of which contains truly obscene amounts of information on Ancient technology. And yet not only do they barely touch on the database in Stargate Universe (no sending a scientist back to, say, research useful ways to get help), but the Lucian Alliance can somehow sneak past it. Word of God is that Atlantis had a fail-safe that required it be returned to the Pegasus Galaxy a few weeks later (this was to have been the plot of the Atlantis movie had it been greenlit), which addresses only some of these omissions.
Justified with the Aterro device, an Ancient superweapon that destroys Wraith ships when they jump to hyperspace, but also causes Stargates to explode when dialed. While the Avenger Program from SG-1 could have crippled the gate network and allowed the device to work safely for brief periods to help end the war with the Wraith, by the time that the Atlantis team figured out what had happened, Todd had already hijacked the Daedalus and set a course to destroy the device.
 Forgotten Phlebotinum / int_605dd875
featureApplicability
1.0
 Forgotten Phlebotinum / int_605dd875
featureConfidence
1.0
 Stargate-verse (Franchise)
hasFeature
Forgotten Phlebotinum / int_605dd875
 Forgotten Phlebotinum / int_611c72dc
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_611c72dc
comment
In the Star Trek Novel Verse, the phase-cloak seems to go through this a lot. After its introduction (and successful use) in an episode of Star Trek: The Next Generation, it's largely ignored by the books (as well as later TV series). A short story in a Star Trek: New Frontier anthology eventually suggested the prototype was destroyed soon after the episode. By the time of Star Trek: The Genesis Wave, the Romulans are making use of the technology again, or something very much like it, but then it drops off a second time, and when Star Trek: Titan comes round no-one's using it. Finally, in the Star Trek: Typhon Pact series, we're explicitly told the Romulans have finally perfected it.
At least in The Next Generation, it was mentioned that the Federation had negotiated away its right to use cloaking technology in a treaty with the Romulans, making the Federations research into the phase-cloak illegal (i.e., a treaty violation that could lead to war with the Romulans). The episode showing the Romulans were working on it themselves showed that it was giving them trouble, and the illegal Federation project Riker had been a part of had not ended well either.
 Forgotten Phlebotinum / int_611c72dc
featureApplicability
1.0
 Forgotten Phlebotinum / int_611c72dc
featureConfidence
1.0
 Star Trek Novel Verse
hasFeature
Forgotten Phlebotinum / int_611c72dc
 Forgotten Phlebotinum / int_61c6b600
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_61c6b600
comment
In Star Trek: First Contact, the invading Borg are able to create a "temporal vortex" to travel back in time to the 21st century. At the end of the movie, the Enterprise is able to easily recreate this effect to travel back to their own time. This method of time travel seems easier and much safer than the other established method of slingshotting around a star at warp 10, but it's never mentioned again. And if the Borg posses the technology to Time Travel at will, why not use it to undo all their failures? In particular, they could have averted their Hopeless War with Species 8472.
 Forgotten Phlebotinum / int_61c6b600
featureApplicability
-1.0
 Forgotten Phlebotinum / int_61c6b600
featureConfidence
1.0
 Star Trek: First Contact
hasFeature
Forgotten Phlebotinum / int_61c6b600
 Forgotten Phlebotinum / int_631805af
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_631805af
comment
In Metal Gear Solid 4: Guns of the Patriots, the War Economy has made oil and gas "as valuable as diamonds". Guess OILIXnote Synthesized petroleum that's as good as the real thing. never really caught on, then.
 Forgotten Phlebotinum / int_631805af
featureApplicability
1.0
 Forgotten Phlebotinum / int_631805af
featureConfidence
1.0
 Metal Gear Solid 4: Guns of the Patriots (Video Game)
hasFeature
Forgotten Phlebotinum / int_631805af
 Forgotten Phlebotinum / int_64a41059
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_64a41059
comment
The "throwing 'S' shield" in Superman II. During a fight which occurs just before the climax, Supes rips off a copy of the 'S' emblem on his chest and uses it to temporarily incapacitate Non (one of the escaped Kryptonians). It's never explained how Clark does this, and he never uses it again in the following films. It sure would have come in handy against the evil Clark or Nuclear Man, even if it was a cheap-looking effect.
 Forgotten Phlebotinum / int_64a41059
featureApplicability
1.0
 Forgotten Phlebotinum / int_64a41059
featureConfidence
1.0
 Superman II
hasFeature
Forgotten Phlebotinum / int_64a41059
 Forgotten Phlebotinum / int_69085a0
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_69085a0
comment
Thankfully, the head cannons see more consistent use in later Macross series.
 Forgotten Phlebotinum / int_69085a0
featureApplicability
1.0
 Forgotten Phlebotinum / int_69085a0
featureConfidence
1.0
 Macross
hasFeature
Forgotten Phlebotinum / int_69085a0
 Forgotten Phlebotinum / int_6e1d5f36
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_6e1d5f36
comment
Farscape:
Zhaan is capable of camouflaging herself like a chameleon, but only uses this ability in one episode ("Bone to be Wild", Season 1). She is a plant and this is one of the few times she is in a forest, but one would think it would be harder for her to camouflage herself against something as complex as foliage, compared to the relatively uniform interior of Moya.
D'Argo's super-long tongue and anesthetic saliva gets forgotten every fifth episode or so. His arms and legs are bound, while a sole villain gloats nearby without a helmet, whatever shall he do? The funniest is when John asks him to knock him out in "A Prefect Murder", and D'Argo pistol whips him. And it doesn't work. John asks him to hit him again harder.
In the 8th episode "They've Got A Secret", the living ship Moya decides that her passengers pose a threat to her unborn baby. Using just one D.R.D. (a little robotic repair drone), Moya proceeds to glue Aeryn Sun to the deck - instantly neutralizing her in a non-lethal manner. In the following 80 episodes and the two hour mini-series, not one of the crew ever thinks of using this same tactic on the endless stream of hostile and dangerous beings that board the ship despite the fact that they have hundreds of D.R.D.s at their command.
 Forgotten Phlebotinum / int_6e1d5f36
featureApplicability
1.0
 Forgotten Phlebotinum / int_6e1d5f36
featureConfidence
1.0
 Farscape
hasFeature
Forgotten Phlebotinum / int_6e1d5f36
 Forgotten Phlebotinum / int_70814599
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_70814599
comment
Stargate SG-1 usually avoids this, with plenty of Chekhovs Boomerangs shown years apart, but it still has its examples.
Kull Warrior Armor. That stuff shrugs off claymore explosions, and is light enough to wear, yet while Vala is able to get her hands on a suit and capture a starship — a United States starship, no less, so you'd think they learn — with it, the US military doesn't even seem interested in it. Plus it looks really badass.
Season 3, "Past and Present": They discover a drug that reverses the effects of aging. Next episode, it's forgotten.
 Forgotten Phlebotinum / int_70814599
featureApplicability
1.0
 Forgotten Phlebotinum / int_70814599
featureConfidence
1.0
 StargateSG1
hasFeature
Forgotten Phlebotinum / int_70814599
 Forgotten Phlebotinum / int_72262aee
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_72262aee
comment
Events surrounding the second season finale of Avatar: The Last Airbender left many wondering why Katara, who had theorized that her vial of water from the sacred oasis retained healing properties, didn't make so much as an attempt to whip it out and use on the mortally wounded Tragic Hero Jet a few episodes beforehand. The DVD commentary has the co-creators admit that they forgot it, but said it wouldn't have worked anyway.
 Forgotten Phlebotinum / int_72262aee
featureApplicability
1.0
 Forgotten Phlebotinum / int_72262aee
featureConfidence
1.0
 Avatar: The Last Airbender
hasFeature
Forgotten Phlebotinum / int_72262aee
 Forgotten Phlebotinum / int_73a9c933
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_73a9c933
comment
In several episodes of The Walking Dead dead people's intestines smeared on you are enough to enable you to pass by walkers unmolested, which everyone seems to forget immediately afterwards.
 Forgotten Phlebotinum / int_73a9c933
featureApplicability
1.0
 Forgotten Phlebotinum / int_73a9c933
featureConfidence
1.0
 The Walking Dead
hasFeature
Forgotten Phlebotinum / int_73a9c933
 Forgotten Phlebotinum / int_73d7930f
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_73d7930f
comment
Star Trek: Deep Space Nine:
They came up with a holographic communications array, installed it on the Defiant's bridge and Sisko's office, used it all of three times and forgot all about it. Other than looking cool and saving some money on blue-screen usage, it really served no purpose at all.note This was eventually retconned in Star Trek: Discovery as having existed even before TOS days. It was removed from the Enterprise both because it interfered with her older systems and because Pike just plain didn't like how it made everyone look like ghosts. It's possible the rest of Starfleet soon gave up on the tech and went back to the good old screens.
The easily replicable TR-116 rifle, a projectile weapon capable of shooting through walls thanks to a recent modification the episode's villain had made to it (a combination of x-ray goggles and micro-transporter).
 Forgotten Phlebotinum / int_73d7930f
featureApplicability
1.0
 Forgotten Phlebotinum / int_73d7930f
featureConfidence
1.0
 Star Trek: Deep Space Nine
hasFeature
Forgotten Phlebotinum / int_73d7930f
 Forgotten Phlebotinum / int_741f1896
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_741f1896
comment
A particular device in Special School is designed to make people (except certain psychics) to forget all about it.
 Forgotten Phlebotinum / int_741f1896
featureApplicability
1.0
 Forgotten Phlebotinum / int_741f1896
featureConfidence
1.0
 SpecialSchool
hasFeature
Forgotten Phlebotinum / int_741f1896
 Forgotten Phlebotinum / int_7b4b5fae
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_7b4b5fae
comment
In the Dungeons & Dragons episode "Beauty and the Bogbeast", a magical river was introduced. At a particular time every year, it could take the heroes anywhere they wanted to go - Earth included. Naturally, they are forced to turn around, at the last minute, due to extenuating circumstances. They never seem to consider that there's nothing stopping them from coming back (it's not clear how long the series takes place over, but it can't be that much less) next year and making sure no one gets turned into a bogbeast this time. Even considering the source, if there was ever an episode to throw on the Fanon Dis Continuity pile anyway...
The episode "In Search Of the Dungeon Master" introduces a "Know Tree," a talking tree who claims to know "everything there is to know," including how to get the kids home. However, when Dungeon Master is kidnapped, the tree instantly becomes aware of it and gets so spooked that he clams up and stops talking. Still, we never see the kids return to try asking him again, once things have calmed down. Heck, it's implied that he isn't even the only Know Tree around.
 Forgotten Phlebotinum / int_7b4b5fae
featureApplicability
1.0
 Forgotten Phlebotinum / int_7b4b5fae
featureConfidence
1.0
 Dungeons & Dragons
hasFeature
Forgotten Phlebotinum / int_7b4b5fae
 Forgotten Phlebotinum / int_7f8a38b6
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_7f8a38b6
comment
In Mobile Suit Gundam Wing, the main Gundams all have shields with offensive capabilities. Wing Gundam's shield can be used as a stabbing weapon; Wing Zero has the same, except it actually extends to be more effective; Deathscythe (and its upgrade. Deathscythe Hell) has a Buster Shield, which opens up and produces a blade and is then launched at an enemy, Heavyarms' shield is integrated into its Beam Gatling; Sandrock's shield can be combined with its weapons and jetpack to create a superweapon and can be used as a blinding flare, and Shenlong can throw its shield to destroy a mobile suit. Yet other than the Heavyarms, these offensive capabilities were each used precisely once by the suit over the course of the series.
 Forgotten Phlebotinum / int_7f8a38b6
featureApplicability
1.0
 Forgotten Phlebotinum / int_7f8a38b6
featureConfidence
1.0
 Mobile Suit Gundam Wing
hasFeature
Forgotten Phlebotinum / int_7f8a38b6
 Forgotten Phlebotinum / int_81692f99
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_81692f99
comment
Star Trek:
The movies introduce the Genesis device (a form of instant terraforming that may bring people back to life as a side effect), which is so much further advanced than anything the Federation possesses before or since that it might as well be magic. The planet it creates disintegrates within a couple weeks, but surely there would be a way to work the kinks out within the next century, and the research that went into it could at least be applied to other projects, like a handy-dandy anti-Borg weapon. But in The Next Generation and Deep Space Nine terraforming is a long and arduous process that yields modest results. Ultimately it's a case of No Plans, No Prototype, No Backup; every copy of the schematics is lost and everyone who knows how to make it is dead. Given that the Klingons considered it a treaty-violating potential planet-killing superweapon, there was probably political pressure not to rebuild it.
Star Trek: The Original Series was notorious for this.
In "Plato's Stepchildren", the Enterprise crew discovers kironide, a drug that gives people telekinetic powers. Why wasn't this made a standard part of the medical kit, even if it is too dangerous to use all the time?
The subcutaneous transponder ("Patterns of Force"), which gave the ship the ability to lock onto and beam up the landing party if they were out of contact. Its actual purpose in the plot was to give Kirk and Spock a Cool Escape, rather than pull the whole trick-the-one-inept-guard bit again. Despite the number of times they were separated from their communicators, the thing was never seen before or since. You'd think it would be standard issue.
Scalosian water ("Wink of an Eye") gives Super Speed (though with a serious risk of dying from injuries that would normally be trivially minor).
Spores that can regenerate lost body parts, restore the human body to perfect health and give immunity to radiation ("This Side of Paradise").
The episode "The Return of Archons" shows that hand phasers have a wide-beam stun setting that can stun a roomful of people all at once. It shoots a flat beam arc at least ninety degrees wide and has a range of at least twenty meters. Despite the obvious usefulness of such a feature, it is used again exactly once in an episode of Voyager.
"A Piece of the Action" showed the ship's phasers could stun people on the ground and could even exclude the building in the middle of the stun area. Never seen again.
Star Trek: The Next Generation indulged in this far too often.
Consider the "dimensional inverter" used in the episode "The High Ground", that could transport things straight through even a Galaxy-class starship's shields (or any other shields) without trouble, but had a cumulative and lethal side effect on people who used it repeatedly. And while that's obviously a sane reason not to use it in normal service, it does nothing to explain why they didn't use it for, oh, one-way trips by inanimate objects straight through enemy starship shields... objects like armed anti-matter warheads, for example. (Or as a Plan B for when crew members are in danger on the planet but can't be beamed up due to an attack on the ship that requires them to keep their shields up or a Negative Space Wedgie that blocks the beam).
The episode "Lonely Among Us" shows how the transporter could bring the dead back to life! While the person's consciousness had been converted into energy by the being that had possessed him, the episode seems to imply that they can always re-materialize a previously saved version of a crew member.
The Galaxy class has Saucer Separation capability because the Saucer section contains the civilians, laboratories, families, etc., while the lower section contains the warp drive and primary weapon systems. It allows the civilians to be moved out of harm's way if the ship has to go into a firefight. Saucer separation was used twice in the first season of the show, and once in the season 4 premiere, but after that it was forgotten and only sometimes referred to, just to drop the idea afterwards (it was, however, used in one of the movies). The Star Trek: The Next Generation Technical Manual explains in a footnote that the writers never forgot about the Saucer Separation capability, and originally intended to use it as a fairly standard maneuver whenever the ship expected to go into trouble. However, what they discovered is that depicting the separation on screen and showing crew moving to the other set just took too much time during the episode to show fully, and not doing so was too jarring of a sudden transition. Hence, they used it sparingly (if at all) for pacing reasons. note Plus, without the saucer component the stardrive section looks very silly.
"Hero Worship" has Geordi connecting the shields to the warp drive, more than doubling their strength. Never mind the other hundred times when this would have been useful.
The transporters were remembered. The shuttles were (usually) remembered. What was not usually remembered was that the shuttles have independent transporter units of their own, separate from the ship's (they didn't in TOS, but TNG established it).
"Who Watches the Watchers" has Troi and Riker implanted with subcutaneous communicators, allowing two-way communication between themselves and the Enterprise, which only the ground team can hear. Naturally, this technology was only ever used four more times over the course of the entire franchise, despite existing as early as the 22nd Century according to Star Trek: Enterprise.
In "Rascals", a transporter accident turns some crew members into young children. To be sure, this was inconvenient at the time, but the staggering medical implications are never explored. The entire plot of Star Trek: Insurrection need never have happened if they'd just figured out how to zap people back to their twenties every time they got north of, say, fifty. Considering that they were able to reverse-engineer the accident well enough to return the crew members to their original age in the space of one episode, perfecting the treatment shouldn't have been too difficult.
An episode had Dr. Pulaski get a mutated virus that aged her. They used a stray hair from her brush and a transporter to restore her to a condition before she contracted the illness. In other words, if you keep a healthy DNA sample, you can restore someone to any age and cure any disease.
Using two beams due to interference led to the creation of a second Will Riker, completely by accident. Both were physically identical and had the same memories up until that point. Not only is it capable of cloning a person despite there being no additional mass, but there's the question of who is actually materialized, the original person or a copy?
How about Dr. Soong's having spent decades trying to hook Data up with a positronic brain capable of sentient thought, while Geordi did the same thing with one poorly-worded request in the holodeck? Oh, they tell Moriarty that they'll look into how and why it happened so they can try to figure out a way to let him leave the holodeck... and then promptly forget all about it until he shows up again seasons later. He's understandably unhappy about it.note Seeing as sapient holograms are in service just a few years later, it looks like someone did look into it. And they're given about as many legal rights as a wad of used Kleenex.
The Exocomps from "The Quality of Life" were non-humanoid robots made of off-the-shelf parts that rapidly improved themselves to the point of sentience. Despite being hugely effective and friendly (one of them performs a Heroic Sacrifice to save the heroes), they're never mentioned again.
Star Trek: Deep Space Nine:
They came up with a holographic communications array, installed it on the Defiant's bridge and Sisko's office, used it all of three times and forgot all about it. Other than looking cool and saving some money on blue-screen usage, it really served no purpose at all.note This was eventually retconned in Star Trek: Discovery as having existed even before TOS days. It was removed from the Enterprise both because it interfered with her older systems and because Pike just plain didn't like how it made everyone look like ghosts. It's possible the rest of Starfleet soon gave up on the tech and went back to the good old screens.
The easily replicable TR-116 rifle, a projectile weapon capable of shooting through walls thanks to a recent modification the episode's villain had made to it (a combination of x-ray goggles and micro-transporter).
In Star Trek: Voyager, the crew conveniently forgot several gadgets that could have gotten them home, or at least closer to it:
Q Jr, depowered, retains enough Q knowledge to use the Delta Flyer's [insert Techno Babble here] to create portals, without any unpleasant Star Trek Shake-inducing side-effects that we saw. The crew could have done whatever it was that he did and gotten home via a series of portals, or at least - as was often the case with Voyager's non-deadly shortcuts - shaved a decade or two off their trip before the Applied Phlebotinum gave out.
In "Threshold", where the otherwise successful test of an experimental transwarp engine turns Janeway and Paris into newts. An imposing side-effect, to be sure, but one which they have cured by episode's end, leaving them in possession of a magic new transportation technology which could get them back to Earth almost immediately, and a cure for its inevitable side-effect. So rather than using it to return to Earth, or even send a message back to the Federation (this was before the Federation discovered that Voyager and her crew had survived), they roll end credits and never mention it again. Even ignoring the lizard-fication, "Threshold" mentions that the experimental shuttle's computers were jam-packed with detailed and helpful navigation aids and maps for the entire sector—which are never mentioned again.
In one episode Seven of Nine designs Borg-tech shield enhancements, which appear on the outer hull in standard Borg green. These useful modifications vanish after this episode, never to be seen again.
Through contact with a vengeful alien, the crew gained access to the quantum slipstream drive, which could have literally taken them home inside a hour. After the first attempt to replicate the technology was deemed too dangerous to use again, they improved it. This version worked for three minutes, then would have crashed the ship if not for Time Travel fixing. It's discussed, at length, that the technology is stable for those three minutes. No one ever considers just running the drive for two minutes at a time, and they never use the technology again.
Seven of Nine once brought Neelix back from the freakin' dead after several hours via (what else?) nanoprobes. Apparently, the technology must only work on main cast members. Only that one time...
Throughout the series, Voyager manages to cut a collective 30-50 years off their journey. As the (non-altered) future of the series finale "Endgame" shows, after the crew ignored the Borg temporal node, they supposedly spent the next 26 years merrily skipping along on their way to Earth without the aid of any of the aforementioned technologies. It's like the crew just gave up and decided to go the traditional way, even though Janeway wouldn't have hesitated to use an advantage if one presented itself.
The show gives a reason ship-board transporters won't work, but they neglect to explain why they can't use the shuttle's independently-powered transporters.
Several Borg-focused episodes had them assimilating low-tech worlds just to swell their numbers. What makes it this trope is that cloning technology has been frequently shown in the franchise to be widespread and very cheap (to the point that petty criminals from low-tech worlds used it to fake their death); if all they need is bodies they can just make some.
 Forgotten Phlebotinum / int_81692f99
featureApplicability
1.0
 Forgotten Phlebotinum / int_81692f99
featureConfidence
1.0
 Star Trek (Franchise)
hasFeature
Forgotten Phlebotinum / int_81692f99
 Forgotten Phlebotinum / int_81f5d35d
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_81f5d35d
comment
Every once in awhile this will happen in Kamen Rider due to the Heisei Series being more toyetic.
Kamen Rider X: In Episode 2, Jin Keisuke uses a two-barrel blowdart gun that manages to make short work of GOD minions AND stop the Kid Of The Week from being lynched. In spite of it looking like the coolest thing ever, it is never seen again.
Kamen Rider Kabuto had the ZECT camera which could denote Worms from ordinary humans. That would've been useful later, but instead, characters had to find out who the worm was the hard way. It was completely forgotten after a few episodes.
 Forgotten Phlebotinum / int_81f5d35d
featureApplicability
1.0
 Forgotten Phlebotinum / int_81f5d35d
featureConfidence
1.0
 Kamen Rider (Franchise)
hasFeature
Forgotten Phlebotinum / int_81f5d35d
 Forgotten Phlebotinum / int_8e8ed866
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_8e8ed866
comment
Happened so often in Knight Rider that it became one of the jokes of the series. Aside from the common stunts, Bonnie/April would mention off-the-cuff that they'd added some cool new feature to KITT... which just happened to be exceedingly useful for that episode's problem. Then, it would never be heard about again despite the gadget being a solution to a later problem. Only a very few added features went on to be regularly featured without being implied to have always been there (which invoked the reverse of this trope, why hadn't they been using it?) A few gadgets were explicitly mentioned as being failures and being removed in order to avoid this trope when they were a little too powerful, such as the laser and device that let KITT drive on water.
 Forgotten Phlebotinum / int_8e8ed866
featureApplicability
1.0
 Forgotten Phlebotinum / int_8e8ed866
featureConfidence
1.0
 Knight Rider
hasFeature
Forgotten Phlebotinum / int_8e8ed866
 Forgotten Phlebotinum / int_8eab5c5
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_8eab5c5
comment
Kamen Rider Kabuto had the ZECT camera which could denote Worms from ordinary humans. That would've been useful later, but instead, characters had to find out who the worm was the hard way. It was completely forgotten after a few episodes.
 Forgotten Phlebotinum / int_8eab5c5
featureApplicability
1.0
 Forgotten Phlebotinum / int_8eab5c5
featureConfidence
1.0
 Kamen Rider Kabuto
hasFeature
Forgotten Phlebotinum / int_8eab5c5
 Forgotten Phlebotinum / int_8fda7950
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_8fda7950
comment
Larry Niven formulated "Niven's Law" after realizing that the "Known Space" series featured no less than three indestructible elements — the Slaver stasis field, General Products spaceship hulls, and "Ringworldium" — Ringworld flooring material. He correctly concluded that these boxed him in by eliminating many possible storylines.
 Forgotten Phlebotinum / int_8fda7950
featureApplicability
1.0
 Forgotten Phlebotinum / int_8fda7950
featureConfidence
1.0
 Known Space
hasFeature
Forgotten Phlebotinum / int_8fda7950
 Forgotten Phlebotinum / int_986e857e
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_986e857e
comment
In Ben 10, Ben's Evil Counterpart Kevin 11's original power was the ability to absorb energy, useful for shorting out/controlling machinery and creating instant lightning blasts. As a side effect, he was also able to use it to absorb alien superpowers via physical contact. After using his ability to steal Ben's 10 superpowers, however, Kevin seems to completely forget about his original ability, even though he names himself "Kevin 11" specifically because he has 1 more power than Ben. He fails to use energy control in situations it would have been extremely helpful (i.e. when being held captive by robots), and also fails to absorb any more alien superpowers despite apparently spending a few months roaming the galaxy doing nothing except beating random aliens up. The alternate future episode "Ken 10" shows how useful this would have been, as Future Kevin finally uses his power-stealing ability to become a formidable combination of Sylar and Naraku.
 Forgotten Phlebotinum / int_986e857e
featureApplicability
1.0
 Forgotten Phlebotinum / int_986e857e
featureConfidence
1.0
 Ben 10
hasFeature
Forgotten Phlebotinum / int_986e857e
 Forgotten Phlebotinum / int_9a7088bc
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_9a7088bc
comment
Star Trek: The Original Series was notorious for this.
In "Plato's Stepchildren", the Enterprise crew discovers kironide, a drug that gives people telekinetic powers. Why wasn't this made a standard part of the medical kit, even if it is too dangerous to use all the time?
The subcutaneous transponder ("Patterns of Force"), which gave the ship the ability to lock onto and beam up the landing party if they were out of contact. Its actual purpose in the plot was to give Kirk and Spock a Cool Escape, rather than pull the whole trick-the-one-inept-guard bit again. Despite the number of times they were separated from their communicators, the thing was never seen before or since. You'd think it would be standard issue.
Scalosian water ("Wink of an Eye") gives Super Speed (though with a serious risk of dying from injuries that would normally be trivially minor).
Spores that can regenerate lost body parts, restore the human body to perfect health and give immunity to radiation ("This Side of Paradise").
The episode "The Return of Archons" shows that hand phasers have a wide-beam stun setting that can stun a roomful of people all at once. It shoots a flat beam arc at least ninety degrees wide and has a range of at least twenty meters. Despite the obvious usefulness of such a feature, it is used again exactly once in an episode of Voyager.
"A Piece of the Action" showed the ship's phasers could stun people on the ground and could even exclude the building in the middle of the stun area. Never seen again.
 Forgotten Phlebotinum / int_9a7088bc
featureApplicability
1.0
 Forgotten Phlebotinum / int_9a7088bc
featureConfidence
1.0
 Star Trek: The Original Series
hasFeature
Forgotten Phlebotinum / int_9a7088bc
 Forgotten Phlebotinum / int_a1117942
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_a1117942
comment
Tekkaman Blade gives us the Hi-Coat Voltekka, an upgrade to Blade's Voltekka. It's used once in it's introduction episode to defeat Evil and then again three episodes to shoot down a nuke. Then the time skip happens and it's not seen again.
 Forgotten Phlebotinum / int_a1117942
featureApplicability
1.0
 Forgotten Phlebotinum / int_a1117942
featureConfidence
1.0
 Tekkaman Blade
hasFeature
Forgotten Phlebotinum / int_a1117942
 Forgotten Phlebotinum / int_a183d57f
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_a183d57f
comment
In Futurama, Richard Nixon's head uses a robot body in one episode, and Beck's head controls a small set of robot arms in another. If heads in jars can control robot bodies, why don't most of them do it?
The day Nixon was elected, he got himself a gargantuan robot body complete with integrated rocket launchers. Where did it go?
 Forgotten Phlebotinum / int_a183d57f
featureApplicability
1.0
 Forgotten Phlebotinum / int_a183d57f
featureConfidence
1.0
 Futurama
hasFeature
Forgotten Phlebotinum / int_a183d57f
 Forgotten Phlebotinum / int_a46c9a7a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_a46c9a7a
comment
X-Men:
Rogue can't have a relationship with anyone due to her powers. Gambit's mutant powers used to allow him to touch her without an issue, which has since been forgotten. In addition, there have been numerous items that temporarily disabled mutant powers, many of which have been captured by the X-Men, but are never mentioned in relation to this issue. At least one writer has admitted that there is no in-universe reason someone like Forge couldn't whip up a gadget to temporarily nullify Rogue's powers whenever she wanted, but that would make her character "less interesting".
Cyclops, during a plan to infiltrate Magneto's band by disguising himself as Erik the Red, creates a pair of gloves that somehow allow him to fire his optic blasts out of his hands instead of just his eyes, which he uses to devastating effect for the duration. While the identity of Erik the Red itself is used by several other characters, these gloves are never used by Cyclops again despite the incredible effectiveness it showed, the much greater versatility it could have afforded him, and the fact that it would have finally allow him to have another option during the numerous times he's had his optic blasts blocked for one reason or another.
 Forgotten Phlebotinum / int_a46c9a7a
featureApplicability
1.0
 Forgotten Phlebotinum / int_a46c9a7a
featureConfidence
1.0
 X-Men (Comic Book)
hasFeature
Forgotten Phlebotinum / int_a46c9a7a
 Forgotten Phlebotinum / int_a8729c90
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_a8729c90
comment
The Fairly OddParents. Sometimes Timmy Turner wishes for superpowers. Sometimes he doesn't unwish them. These actually show up later and affect the plot. Same with magical items, handwaved by saying that they were neglected or that Cosmo was screwing with them.
 Forgotten Phlebotinum / int_a8729c90
featureApplicability
1.0
 Forgotten Phlebotinum / int_a8729c90
featureConfidence
1.0
 The Fairly OddParents
hasFeature
Forgotten Phlebotinum / int_a8729c90
 Forgotten Phlebotinum / int_ac07f986
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_ac07f986
comment
Challenge of the Super Friends is notorious for this trope.
Lex Luthor invents teleporters, time machines, cloaking devices, a gizmo that sucks the Green Lantern Ring off its wearer's finger, etc., etc. ... uses them once ... and then then never uses them again, even in situations where one of them would save the Legion of Doom's bacon.
One particularly damning example has Luthor forget a piece of Phlebotinum only moments after acquiring it. When he time travels to alter several of the Super Friends' origins, Luthor switches places with Hal Jordan and becomes the recipient of Abin Sur's Green Lantern ring. He dons his own Green Lantern suit and uses the ring to fly back to the Hall of Doom, and then promptly puts his purple jump suit back on and makes no other attempt to use the ring. This after having been defeated by Green Lantern's power too many times to count! (On the other hand he's on a team with an ex-Green Lantern who got busted abusing his powers. Maybe he's playing it safe.)
 Forgotten Phlebotinum / int_ac07f986
featureApplicability
1.0
 Forgotten Phlebotinum / int_ac07f986
featureConfidence
1.0
 Superfriends
hasFeature
Forgotten Phlebotinum / int_ac07f986
 Forgotten Phlebotinum / int_acc5f677
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_acc5f677
comment
Kamen Rider X: In Episode 2, Jin Keisuke uses a two-barrel blowdart gun that manages to make short work of GOD minions AND stop the Kid Of The Week from being lynched. In spite of it looking like the coolest thing ever, it is never seen again.
 Forgotten Phlebotinum / int_acc5f677
featureApplicability
1.0
 Forgotten Phlebotinum / int_acc5f677
featureConfidence
1.0
 Kamen Rider X
hasFeature
Forgotten Phlebotinum / int_acc5f677
 Forgotten Phlebotinum / int_af566418
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_af566418
comment
Incredibly, Ben 10: Ultimate Alien appears to have forgotten about the Ultimate forms, which give the new show its title in one of its first episodes.
 Forgotten Phlebotinum / int_af566418
featureApplicability
1.0
 Forgotten Phlebotinum / int_af566418
featureConfidence
1.0
 Ben 10: Ultimate Alien
hasFeature
Forgotten Phlebotinum / int_af566418
 Forgotten Phlebotinum / int_b0028436
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_b0028436
comment
JoJo's Bizarre Adventure:
The first two parts focused on protagonists using the Ripple in a wide variety of ways to fight vampires and similar creatures. From part three onward, the series focuses instead on Stand-based duels, no new Ripple users are introduced, and the one Ripple-user that's still around only uses its now-highly situational vampire-slaying ability.
Cyborgs were introduced in Part 2 and are rarely referenced afterward, save for two characters' mechanical hands. When one of those characters loses their legs, the idea of them ever being replaced with cybernetics is never brought up.
 Forgotten Phlebotinum / int_b0028436
featureApplicability
1.0
 Forgotten Phlebotinum / int_b0028436
featureConfidence
1.0
 JoJo's Bizarre Adventure (Manga)
hasFeature
Forgotten Phlebotinum / int_b0028436
 Forgotten Phlebotinum / int_b41cd8a7
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_b41cd8a7
comment
In the first episode of Chad Vader, he is shown to have the ability to force choke people, and he uses it on a guy who annoys him. In later episodes, his nemesis repeatedly humiliates him, and he just fumes impotently.
 Forgotten Phlebotinum / int_b41cd8a7
featureApplicability
1.0
 Forgotten Phlebotinum / int_b41cd8a7
featureConfidence
1.0
 Chad Vader (Web Video)
hasFeature
Forgotten Phlebotinum / int_b41cd8a7
 Forgotten Phlebotinum / int_b6886bfd
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_b6886bfd
comment
Star Trek Into Darkness: It is revealed late in the film that an augment's blood can resurrect the dead, and is subsequently used to heal Kirk from fatal radiation poisoning (after a point in which everything but his higher brain functions have failed). This is a pretty significant discovery to have lost for two hundred years.
 Forgotten Phlebotinum / int_b6886bfd
featureApplicability
1.0
 Forgotten Phlebotinum / int_b6886bfd
featureConfidence
1.0
 Star Trek Into Darkness
hasFeature
Forgotten Phlebotinum / int_b6886bfd
 Forgotten Phlebotinum / int_ba4b95c9
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_ba4b95c9
comment
In Time Trax, in some episodes the fugitives, after the requisite dose of TXP, were sent back immediately after S.E.L.M.A. emitted a "transmission tone", but in others, the paralyzed fugitive's body had to be hidden until a personal ad was placed in a previously agreed newspaper, so TRAX could retrieve the fugitive. (That without taking into consideration the oft-repeated assertion that the changes in the past wouldn't affect the future because Darien Lambert and the fugitives were sent to a parallel timeline.)
 Forgotten Phlebotinum / int_ba4b95c9
featureApplicability
1.0
 Forgotten Phlebotinum / int_ba4b95c9
featureConfidence
1.0
 Time Trax
hasFeature
Forgotten Phlebotinum / int_ba4b95c9
 Forgotten Phlebotinum / int_bdf7310a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_bdf7310a
comment
Phaeton has Trayen, who often gets caught up in battle and forgets just what he's really capable of. And Teliha isn't very good at remembering her spells either.
 Forgotten Phlebotinum / int_bdf7310a
featureApplicability
1.0
 Forgotten Phlebotinum / int_bdf7310a
featureConfidence
1.0
 Phaeton
hasFeature
Forgotten Phlebotinum / int_bdf7310a
 Forgotten Phlebotinum / int_c0aa8ea9
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_c0aa8ea9
comment
By the end of the series, Atlantis is on Earth. Atlantis. The Ancient city-ship with sensors that are capable of picking up even cloaked ships in practically one third of the galaxy away from wherever it happens to be. The database of which contains truly obscene amounts of information on Ancient technology. And yet not only do they barely touch on the database in Stargate Universe (no sending a scientist back to, say, research useful ways to get help), but the Lucian Alliance can somehow sneak past it. Word of God is that Atlantis had a fail-safe that required it be returned to the Pegasus Galaxy a few weeks later (this was to have been the plot of the Atlantis movie had it been greenlit), which addresses only some of these omissions.
 Forgotten Phlebotinum / int_c0aa8ea9
featureApplicability
1.0
 Forgotten Phlebotinum / int_c0aa8ea9
featureConfidence
1.0
 Stargate Universe
hasFeature
Forgotten Phlebotinum / int_c0aa8ea9
 Forgotten Phlebotinum / int_c4282b71
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_c4282b71
comment
My Little Pony: Friendship Is Magic: Season 1 is full of this. The Elements of Harmony (and Princess Luna) are completely forgotten about after the second episode, Twilight Sparkle never teleported after episode four, Pinkie's "Pinkie Sense" is never mentioned again, and while the Sonic Rainboom pops up later it is only in a series of flashbacks. Season two turned all of these and more into Chekhovs Boomerangs... for, in most cases, exactly one episode each, after which they all went back to being forgotten if Rule of Drama requires it. By the end of season 2 the teleport spell was casual use. Some of these were due to an instruction from Hasbro to avoid Continuity Lockout, since they wanted to be able to broadcast and syndicate the episodes in any order. That doesn't explain late-Season-1-Twilight's aversion to teleportation, though.
 Forgotten Phlebotinum / int_c4282b71
featureApplicability
-1.0
 Forgotten Phlebotinum / int_c4282b71
featureConfidence
1.0
 My Little Pony: Friendship Is Magic
hasFeature
Forgotten Phlebotinum / int_c4282b71
 Forgotten Phlebotinum / int_c43df4d8
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_c43df4d8
comment
Doctor Who, both Classic and New Series, does this a lot.
The TARDIS has had many features used over the decades that were completely forgotten soon afterwards: it can drift back to its owner if separated from them in time ("Revenge of the Cybermen"), it has a Space-Time Visualiser ("The Space Museum", "The Chase" and "The Moonbase"), a Hostile Action Displacement System ("The Krotons", "Cold War") and other features. Considering that the TARDIS was a museum piece even before the Doctor stole it over a millennium ago and is highly temperamental even at the best of times, it's entirely probable that these things literally don't work anymore.
Companions sometimes call the Doctor out on this in relation to the TARDIS. But it's conveniently stolen, missing, or can't be used due to the danger of crossing their own timestreams, which is apparently very bad.
A machine that created a candy-bar-shaped equivalent to Food Pills appears once in the 1963 season and is never seen again.
"Pyramids of Mars": The Doctor says the TARDIS' controls are isomorphic, meaning only he can operate it, which keeps Sutekh from having him killed. Given the number of times others have operated the TARDIS, this was either another lie or a security setting.
In "The Hand of Fear", the Fourth Doctor states that the TARDIS' temporal grace disallows violence within the TARDIS. Subsequently (and previous) stories ignored this. The Eleventh Doctor later admitted that it was a "clever lie".
The Chula, mentioned in "The Empty Child"/"The Doctor Dances", produced nanobots capable of healing any injury and even reviving the dead, and in enough numbers to work over whole planets worth of people. Why hasn't the Doctor simply gone to Chula and got some for himself? One possible justification is that the Chula are implied to be warriors, with Jack's ship and the pod containing the nanogenes being a stolen Chula warship and ambulance for patching up their soldiers, respectively. Such a trip might not only be too dangerous, but the Chula might not want to share this technology with anyone.
At the end of "The Christmas Invasion" the vast alien starship that had been menacing the whole planet is utterly destroyed by a colossal laser fired from beneath London. This fantastic weapon devised by Torchwood London from captured alien technology for the defense of the kingdom from extraterrestrial perils is never again mentioned, despite London being menaced by aliens so frequently that its citizens get into the habit of evacuating over Christmas so as not to be there when the monsters turn up. However, the same technology (or, at least, similar special effects) seems to now be incorporated into the Valiant, as seen in "The Poison Sky", so even if the main weapon was destroyed, it's not all gone to waste. At least, until "The Stolen Earth", when spoiler:the Valiant is overwhelmed and destroyed by the Daleks off-screen.
At the end of "Partners in Crime", the Doctor discards into a rubbish bin a sonic pen which opened a deadlock seal when used with his own screwdriver, one of the few locks his sonic screwdriver can't deal with.note Justified since the deadlock seal in question belonged to the pen's owner, so that was probably the only deadlock seal that the pen could open.
"Orphan 55" has an inexplicable absence of the TARDIS' Translator Microbes when Graham and Yaz are unable to read a sign written in Cyrillic, requiring the Doctor to translate for them — even though the translation has worked on both writing and Russian before. The only even slightly plausible explanation, not counting Negative Continuity, is that the team's current distance from the TARDIS (since they were teleported directly to the planet the episode is set on) made it impossible, but the fact that everyone else at Tranquillity Spa thus apparently speaks 21st century English puts a big hole in this theory.
 Forgotten Phlebotinum / int_c43df4d8
featureApplicability
1.0
 Forgotten Phlebotinum / int_c43df4d8
featureConfidence
1.0
 Doctor Who
hasFeature
Forgotten Phlebotinum / int_c43df4d8
 Forgotten Phlebotinum / int_c4a22754
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_c4a22754
comment
As pointed out in Yu-Gi-Oh!: The Abridged Movie, Kaiba never used the cards given to him by Pegasus ever again, even in episodes set later, and though they are able to defeat the Egyptian God Cards. Nor does anyone in the series ever mention either the Pyramid of Light or the Blue-Eyes Shining Dragon. Ever. (Granted, the movie wasn't part of the original storyline, neither anime or manga.)
 Forgotten Phlebotinum / int_c4a22754
featureApplicability
1.0
 Forgotten Phlebotinum / int_c4a22754
featureConfidence
1.0
 Yu-Gi-Oh! The Abridged Series (Web Video)
hasFeature
Forgotten Phlebotinum / int_c4a22754
 Forgotten Phlebotinum / int_c6f7e804
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_c6f7e804
comment
Blake's 7.
"Project Avalon" states that the Federation Mind Probe is an infallible method of interrogation. That doesn't stop Cold-Blooded Torture being used in later seasons, despite being less efficient.
In the Two-Part Episode that introduces Orac, the Magical Computer can extrapolate the future and destroy an enemy vessel by hacking into and detonating the missiles it carries. Neither of these extremely useful abilities are ever mentioned again.
In "Cygnus Alpha", Avon and Jenna discover the Liberator is carrying a vast fortune in jewelry, more than in the entire Federation banking system according to Avon, who urges Jenna to take the money and run, saying that Blake will just use it for his Hopeless War. But we never see Blake using it to finance La Résistance (except for a few crystals in "Shadow"); in fact several future episodes are based on The Caper in order to steal for the revolution (or make our anti-heroes rich).
 Forgotten Phlebotinum / int_c6f7e804
featureApplicability
1.0
 Forgotten Phlebotinum / int_c6f7e804
featureConfidence
1.0
 Blake's 7
hasFeature
Forgotten Phlebotinum / int_c6f7e804
 Forgotten Phlebotinum / int_cabb7dd6
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_cabb7dd6
comment
In Yokoka's Quest, Yang gives Yokoka some Lava Powder, which is a medicine to cure fevers - she then forgets to use it when she gets a fever in the next chapter, and it is ruined note (the inventory listing is updated to Soggy Powder) in a fight a few chapters later.
 Forgotten Phlebotinum / int_cabb7dd6
featureApplicability
1.0
 Forgotten Phlebotinum / int_cabb7dd6
featureConfidence
1.0
 Yokoka's Quest (Webcomic)
hasFeature
Forgotten Phlebotinum / int_cabb7dd6
 Forgotten Phlebotinum / int_cb570c4a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_cb570c4a
comment
At no point in Mostly Harmless or And Another Thing... does Arthur Dent show any sign that he knows how to fly, a skill he learned in Life, the Universe and Everything and which was fairly significant in So Long, and Thanks for All the Fish.
 Forgotten Phlebotinum / int_cb570c4a
featureApplicability
1.0
 Forgotten Phlebotinum / int_cb570c4a
featureConfidence
1.0
 Mostly Harmless
hasFeature
Forgotten Phlebotinum / int_cb570c4a
 Forgotten Phlebotinum / int_cccefdf1
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_cccefdf1
comment
Justified in Stroker and Hoop with Hoop learning ninja skills for plot-related reasons in one episode, but never using them again. It's then brought up in another episode. Turns out you have to actually continue practicing to maintain ninja skills. Who knew?
 Forgotten Phlebotinum / int_cccefdf1
featureApplicability
1.0
 Forgotten Phlebotinum / int_cccefdf1
featureConfidence
1.0
 Stroker and Hoop
hasFeature
Forgotten Phlebotinum / int_cccefdf1
 Forgotten Phlebotinum / int_cf3e7a82
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_cf3e7a82
comment
Superman:
Silver Age's Superman had a lead-glass suit. It's flexible, bulletproof, doesn't cover up the "S", and is impervious to kryptonite radiation. It shows up in one issue.
The Silver Age had tons of Forgotten Phlebotinum. For example, there is Action Comics #252, an issue otherwise better known for being Supergirl's first appearance. In the lead-in story, though, Superman is being menaced by kryptonite, and he escapes by melting it with his heat vision, at which point he learns the liquid kryptonite is no longer harmful. (In a real head against wall moment, he even says that it's because when items change their state, they lose other properties, like how ice, when it melts into water, stops being cold. Superman forgets that liquid kryptonite is harmless to him thereafter, and in fact, liquid and gaseous kryptonite are shown being harmful to him in later stories. So maybe he found the only chunk of kryptonite in the universe that would be harmless to him if it were liquid.
In those days, Superman also collected all manner of exotic gadgets in his Fortress of Solitude, in addition to all the Kryptonian gizmos in the Bottle City of Kandor. Generally, DC Comics's Superman continuity cop (and world's biggest Superman fanboy) E. Nelson Bridwell was the only writer who consistently remembered what a fantastic array of machines Superman had access to.
 Forgotten Phlebotinum / int_cf3e7a82
featureApplicability
1.0
 Forgotten Phlebotinum / int_cf3e7a82
featureConfidence
1.0
 Superman (Franchise)
hasFeature
Forgotten Phlebotinum / int_cf3e7a82
 Forgotten Phlebotinum / int_d131c1e9
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_d131c1e9
comment
A major problem with Star Trek: The Animated Series being considered canon is that the enormously useful life support belts never appear in any later Trek works. The belt surrounded the wearer with a glowing forcefield within which breathable air was provided. The real reason was that it was cheaper to animate a glowing outline than it was to draw spacesuits on everyone.
 Forgotten Phlebotinum / int_d131c1e9
featureApplicability
1.0
 Forgotten Phlebotinum / int_d131c1e9
featureConfidence
1.0
 Star Trek: The Animated Series
hasFeature
Forgotten Phlebotinum / int_d131c1e9
 Forgotten Phlebotinum / int_d13861fd
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_d13861fd
comment
The loathed One More Day storyline. Aunt May is dying (well, she's only been in her mid-80's for a few decades now, but she was actually injured). Subverting this trope, Peter scours half the mainstay Marvel cast looking for someone that can heal her. Playing this trope straight, nobody can. There's very, VERY thinly implied instances where it's the fact that she's already so old and frail that conventional medicine can't heal her, but considering the fact that those who he approaches include the X-Men (who had no fewer than 3 people at the time whose powers could explicitly heal any wound), Reed Richards, and Doctor Strange - who is both the Sorcerer Supreme and a former neurosurgeon, there's no reason that SOMEONE couldn't have helped him before he ended up letting Mephistopheles wipe out the entire history of his marriage in exchange for Aunt May's life.
 Forgotten Phlebotinum / int_d13861fd
featureApplicability
1.0
 Forgotten Phlebotinum / int_d13861fd
featureConfidence
1.0
 One More Day (Comic Book)
hasFeature
Forgotten Phlebotinum / int_d13861fd
 Forgotten Phlebotinum / int_d461f757
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_d461f757
comment
Battlestar Galactica (2003):
In the middle of season 2, Roslin's cancer takes a turn for the worse, and she's saved at the last minute by the unborn Hera's blood. Now it's likely that Roslin is not the only one in the fleet with cancer (indeed, the season 4 episode "Faith" involves another character with terminal cancer). Yet no one even suggests the possibility of using Hera's blood to cure other cancer patients (or to try it on people with other kinds of terminal illnesses, for that matter). Even more ridiculous is when Roslin's cancer comes back in the season 3 finale, the question of using Hera's blood to cure her again is brought up only once (and ignored) by a reporter. This is also wasted plot potential, since they could have done an episode about the ethics of regularly harvesting a baby's blood for medical purposes.
The Blackbird fighter. Admittedly, they have to scrounge up a lot of supplies and spares to assemble it together but considering that Pegasus had Viper production facilities, it would not be impossible to construct additional stealth ships once the original was destroyed. It would have come in handy during New Caprica or the battle of The Hub.
 Forgotten Phlebotinum / int_d461f757
featureApplicability
1.0
 Forgotten Phlebotinum / int_d461f757
featureConfidence
1.0
 Battlestar Galactica (2003)
hasFeature
Forgotten Phlebotinum / int_d461f757
 Forgotten Phlebotinum / int_d7aab7c1
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_d7aab7c1
comment
Sailor Moon:
In the first episode Sailor Moon's hairclip things (on her odango/buns) can magically allow her to hear people in distress. This comes in handy, as she hears her best friend Naru being attacked by the Monster of the Week and goes to save her. This power is never shown again in later episodes, even though it would probably have come in handy. Similarly, in the first chapter of the manga, the costume included a mask in which she could see the monster attacking Naru by looking in the goggles. The goggles were quickly phased out in the manga, last seen in one transformation sequence where Usagi discarded them as she transformed, though why this happened was never explained. Considering that the monsters of the week/chapter were usually close by anyway, this power wasn't really that necessary in retrospect...
Another forgotten ability was Sailor Moon's disguise pen. It was commonly used early in the series, but forgotten during R and appeared only once later off screen, to explain why Venus was disguised as Moon. This may have been due to the lack of need for Usagi to actually use her disguises in later storylines as she gathered a team of fellow heroes and many of these disguises often appeared superfluous to the plot anyway.
Sailor Moon used a special attack, "Moon Tiara Stardust", in episode 5, to heal a group of transformed humans. She never used this again, despite it possibly being useful in many storylines, though she eventually acquired the Moon Stick which had the same abilities. This is likely because the former attack never showed up in the manga, while the latter item did.
 Forgotten Phlebotinum / int_d7aab7c1
featureApplicability
1.0
 Forgotten Phlebotinum / int_d7aab7c1
featureConfidence
1.0
 Sailor Moon
hasFeature
Forgotten Phlebotinum / int_d7aab7c1
 Forgotten Phlebotinum / int_dab32e3
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_dab32e3
comment
Also extends to other games in the franchise, such as the X series. Here, it's even worse as Mega Man X loses entire suits of his own powerful upgraded armor. But could be justified given the personality of the protagonist and that it was shown he usually disposes of the armors after the crisis.
 Forgotten Phlebotinum / int_dab32e3
featureApplicability
1.0
 Forgotten Phlebotinum / int_dab32e3
featureConfidence
1.0
 Mega Man X (Video Game)
hasFeature
Forgotten Phlebotinum / int_dab32e3
 Forgotten Phlebotinum / int_daff6a21
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_daff6a21
comment
Yu-Gi-Oh! 5D's:
Yusei's Turbo Warrior would have been immune to the effects of the Meklord Emperors and likely would have been useful, but Yusei conveniently forgets that he has Turbo Warrior whenever a Meklord Emperor hits the field.
An even better option that he also had was Dragon Knight Draco-Equiste, a Fusion Monster, meaning that the Meklords couldn't equip it even if its effects were negated. Draco-Equiste only ends up being used in 1 duel.
 Forgotten Phlebotinum / int_daff6a21
featureApplicability
1.0
 Forgotten Phlebotinum / int_daff6a21
featureConfidence
1.0
 Yu-Gi-Oh! 5D's
hasFeature
Forgotten Phlebotinum / int_daff6a21
 Forgotten Phlebotinum / int_dccfc4b8
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_dccfc4b8
comment
Averted in Harry Potter and the Prisoner of Azkaban. The Time Turner is, with only one exception, solely used by Hermione to take multiple classes at the same time. However, the perception of this as forgotten phlebotinum is a common fandom mistake: the Time Turner follows the Stable Time Loop model of Time Travel (you can't actually change the past, only participate in it from a different perspective) and only works in half-hour increments, which isn't that useful.
It would still be immensely useful for spying, though - had Umbridge or the Inquisitorial Squad possessed one in Order of the Phoenix, Dumbledore's Army probably wouldn't have lasted a day. Indeed, it's probably for this reason that Rowling had the entire stock destroyed during the climactic battle in Phoenix, just as the series was accruing more and more Spy Fiction elements.
Additionally, in the play Harry Potter and the Cursed Child, it is revealed that the Time Turner *can* alter the past, as the villain is nearly successful at using one to bring back Lord Voldemort.
 Forgotten Phlebotinum / int_dccfc4b8
featureApplicability
-1.0
 Forgotten Phlebotinum / int_dccfc4b8
featureConfidence
1.0
 Harry Potter and the Prisoner of Azkaban
hasFeature
Forgotten Phlebotinum / int_dccfc4b8
 Forgotten Phlebotinum / int_de6659ec
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_de6659ec
comment
Once Upon a Time:
The Evil Queen in has the ability, at least in the Enchanted Forest, to pull a person's heart out yet leave them not only alive, but subject to her will. It's implied or explicitly stated that she's done this many times, yet she has to send Snow White into the woods with the Woodsman to get him to cut her heart out mundanely, rather than doing the job herself and turning her hated step-daughter into a slave and puppet ruler.
Moreover the Evil Queen's magic mirror is able to locate Snow White anywhere at any time as shown in multiple episodes (such as True North, Ariel and Souls of the Departed), yet there are a few instances where Regina is desperately looking for Snow White; in Page 23 Regina needs a special item (an arrow of Cupid's to find her) and in The Evil Queen she kills an entire village because its inhabitants refuse to tell Regina Snow White's whereabouts.
Emma has the self-proclaimed superpower of being able to tell if someone is lying, yet when she is questioning Greg Mendell about whether he saw Rumplestlitskin use magic, although she has every reason to need to know, she can't tell that he is lying through his teeth. Although Snow did lampshade the fact that her ability is inconsistent, particularly when she's emotionally compromised, implying that Emma's claims of her "superpower" are somewhat exaggerated and/or really worked best during her bailbondperson job, when she was was confident and in control of the situation. She is significantly less in control of things once the magic is revealed, and she's the new kid on the block trying to figure everything out.
True Love's Kiss cures all curses, yet Snow White and Prince Charming occasionally go looking for curses that have befallen one or the other.
The Storybrooke Sheriff's Department has got a surveillance camera recording everything inside the room (its recordings are even viewed in season 3 finale to investigate upon Zelena's death, yet no one thinks of watching the recordings after a Round Table knight is mysteriously killed inside the department in Siege Perilous because that would make the heroes learn Arthur's true colours too early and advance the plot too fast.
 Forgotten Phlebotinum / int_de6659ec
featureApplicability
1.0
 Forgotten Phlebotinum / int_de6659ec
featureConfidence
1.0
 Once Upon a Time
hasFeature
Forgotten Phlebotinum / int_de6659ec
 Forgotten Phlebotinum / int_e179ec3a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_e179ec3a
comment
Calvin and Hobbes: The Series has the MTM (whose name stands for Mini Time Machine), whose original intent as a smaller Time Machine is forgotten in favor of his Do-Anything Robot nature. This is eventually lampshaded in "Nocturnals".
 Forgotten Phlebotinum / int_e179ec3a
featureApplicability
1.0
 Forgotten Phlebotinum / int_e179ec3a
featureConfidence
1.0
 Calvin and Hobbes: The Series (Fanfic)
hasFeature
Forgotten Phlebotinum / int_e179ec3a
 Forgotten Phlebotinum / int_e199d649
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_e199d649
comment
In Inheritance Cycle Eragon learns that Brom's ring contains a massive store of magical energy, enough to rip castles apart. He keeps outright, explicitly, forgetting that he has it.
 Forgotten Phlebotinum / int_e199d649
featureApplicability
1.0
 Forgotten Phlebotinum / int_e199d649
featureConfidence
1.0
 Inheritance Cycle
hasFeature
Forgotten Phlebotinum / int_e199d649
 Forgotten Phlebotinum / int_e293455a
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_e293455a
comment
Buffy the Vampire Slayer
Justified with Adjoining Spell used to defeat the demon cyborg Adam. The following episode had the First Slayer try to kill everyone who used the spell in their dreams, explaining its absence from later seasons.
One episode had the minion of the First Evil falsely claim he had kidnapped a Potential Slayer. Nobody thought of using the "detect a Potential" spell discovered a few episodes before.
At the end of Season 5, Buffy uses a hammer that allows her to pulverize Glorificus, a literal Physical God that had shrugged off absolutely everything that was thrown at her before. Said hammer is never seen or mentioned again, despite how useful it would have been against, say, the Turok-Han or Caleb.
Similar to the flamethrower instance from Angel mentioned above, in a Season 2 episode Buffy kills a random mook vampire by shoving a burning torch/brazier against its chest, which causes it to go up in flames like it was made of straw soaked in gasoline. Given how the series occasionally spiced up vampire-killing up with decapitation or holy water, it's a small wonder fire didn't come up more.
Anya's power center necklace. When she turned demon again, it seemed she never needed it. You'd think, when Buffy decided she had no choice but to kill Anya to keep her from massacring more fraternities, someone might have pointed out that turning Anya back into a human would have limited her carnage potential.
A mundane technology version is the rocket launcher used against the Judge. Buffy is shown to have it as far on as Season 7, but she also never uses it against Caleb or his minions.
 Forgotten Phlebotinum / int_e293455a
featureApplicability
1.0
 Forgotten Phlebotinum / int_e293455a
featureConfidence
1.0
 Buffy the Vampire Slayer
hasFeature
Forgotten Phlebotinum / int_e293455a
 Forgotten Phlebotinum / int_e4732abc
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_e4732abc
comment
Stargate Atlantis:
By the end of the series, Atlantis is on Earth. Atlantis. The Ancient city-ship with sensors that are capable of picking up even cloaked ships in practically one third of the galaxy away from wherever it happens to be. The database of which contains truly obscene amounts of information on Ancient technology. And yet not only do they barely touch on the database in Stargate Universe (no sending a scientist back to, say, research useful ways to get help), but the Lucian Alliance can somehow sneak past it. Word of God is that Atlantis had a fail-safe that required it be returned to the Pegasus Galaxy a few weeks later (this was to have been the plot of the Atlantis movie had it been greenlit), which addresses only some of these omissions.
Justified with the Aterro device, an Ancient superweapon that destroys Wraith ships when they jump to hyperspace, but also causes Stargates to explode when dialed. While the Avenger Program from SG-1 could have crippled the gate network and allowed the device to work safely for brief periods to help end the war with the Wraith, by the time that the Atlantis team figured out what had happened, Todd had already hijacked the Daedalus and set a course to destroy the device.
 Forgotten Phlebotinum / int_e4732abc
featureApplicability
1.0
 Forgotten Phlebotinum / int_e4732abc
featureConfidence
1.0
 Stargate Atlantis
hasFeature
Forgotten Phlebotinum / int_e4732abc
 Forgotten Phlebotinum / int_e8e1a51e
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_e8e1a51e
comment
Rogue can't have a relationship with anyone due to her powers. Gambit's mutant powers used to allow him to touch her without an issue, which has since been forgotten. In addition, there have been numerous items that temporarily disabled mutant powers, many of which have been captured by the X-Men, but are never mentioned in relation to this issue. At least one writer has admitted that there is no in-universe reason someone like Forge couldn't whip up a gadget to temporarily nullify Rogue's powers whenever she wanted, but that would make her character "less interesting".
 Forgotten Phlebotinum / int_e8e1a51e
featureApplicability
1.0
 Forgotten Phlebotinum / int_e8e1a51e
featureConfidence
1.0
 Rogue / Comicbook
hasFeature
Forgotten Phlebotinum / int_e8e1a51e
 Forgotten Phlebotinum / int_ef076a36
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_ef076a36
comment
In Star Trek: Voyager, the crew conveniently forgot several gadgets that could have gotten them home, or at least closer to it:
Q Jr, depowered, retains enough Q knowledge to use the Delta Flyer's [insert Techno Babble here] to create portals, without any unpleasant Star Trek Shake-inducing side-effects that we saw. The crew could have done whatever it was that he did and gotten home via a series of portals, or at least - as was often the case with Voyager's non-deadly shortcuts - shaved a decade or two off their trip before the Applied Phlebotinum gave out.
In "Threshold", where the otherwise successful test of an experimental transwarp engine turns Janeway and Paris into newts. An imposing side-effect, to be sure, but one which they have cured by episode's end, leaving them in possession of a magic new transportation technology which could get them back to Earth almost immediately, and a cure for its inevitable side-effect. So rather than using it to return to Earth, or even send a message back to the Federation (this was before the Federation discovered that Voyager and her crew had survived), they roll end credits and never mention it again. Even ignoring the lizard-fication, "Threshold" mentions that the experimental shuttle's computers were jam-packed with detailed and helpful navigation aids and maps for the entire sector—which are never mentioned again.
In one episode Seven of Nine designs Borg-tech shield enhancements, which appear on the outer hull in standard Borg green. These useful modifications vanish after this episode, never to be seen again.
Through contact with a vengeful alien, the crew gained access to the quantum slipstream drive, which could have literally taken them home inside a hour. After the first attempt to replicate the technology was deemed too dangerous to use again, they improved it. This version worked for three minutes, then would have crashed the ship if not for Time Travel fixing. It's discussed, at length, that the technology is stable for those three minutes. No one ever considers just running the drive for two minutes at a time, and they never use the technology again.
Seven of Nine once brought Neelix back from the freakin' dead after several hours via (what else?) nanoprobes. Apparently, the technology must only work on main cast members. Only that one time...
Throughout the series, Voyager manages to cut a collective 30-50 years off their journey. As the (non-altered) future of the series finale "Endgame" shows, after the crew ignored the Borg temporal node, they supposedly spent the next 26 years merrily skipping along on their way to Earth without the aid of any of the aforementioned technologies. It's like the crew just gave up and decided to go the traditional way, even though Janeway wouldn't have hesitated to use an advantage if one presented itself.
The show gives a reason ship-board transporters won't work, but they neglect to explain why they can't use the shuttle's independently-powered transporters.
Several Borg-focused episodes had them assimilating low-tech worlds just to swell their numbers. What makes it this trope is that cloning technology has been frequently shown in the franchise to be widespread and very cheap (to the point that petty criminals from low-tech worlds used it to fake their death); if all they need is bodies they can just make some.
 Forgotten Phlebotinum / int_ef076a36
featureApplicability
1.0
 Forgotten Phlebotinum / int_ef076a36
featureConfidence
1.0
 Star Trek: Voyager
hasFeature
Forgotten Phlebotinum / int_ef076a36
 Forgotten Phlebotinum / int_f0529579
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_f0529579
comment
Spider-Man:
Peter makes a gas mask for himself that is completely concealed by his Spider-Man suit; he uses it once and never again, even though he is regularly hit with gas attacks several times during the early run of the comic.
The loathed One More Day storyline. Aunt May is dying (well, she's only been in her mid-80's for a few decades now, but she was actually injured). Subverting this trope, Peter scours half the mainstay Marvel cast looking for someone that can heal her. Playing this trope straight, nobody can. There's very, VERY thinly implied instances where it's the fact that she's already so old and frail that conventional medicine can't heal her, but considering the fact that those who he approaches include the X-Men (who had no fewer than 3 people at the time whose powers could explicitly heal any wound), Reed Richards, and Doctor Strange - who is both the Sorcerer Supreme and a former neurosurgeon, there's no reason that SOMEONE couldn't have helped him before he ended up letting Mephistopheles wipe out the entire history of his marriage in exchange for Aunt May's life.
 Forgotten Phlebotinum / int_f0529579
featureApplicability
1.0
 Forgotten Phlebotinum / int_f0529579
featureConfidence
1.0
 SpiderMan
hasFeature
Forgotten Phlebotinum / int_f0529579
 Forgotten Phlebotinum / int_f2041376
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_f2041376
comment
The spirit board from Charmed (1998), which was used for all of three episodes before disappearing in season three until it finally resurfaced for one last use in season 8.
 Forgotten Phlebotinum / int_f2041376
featureApplicability
1.0
 Forgotten Phlebotinum / int_f2041376
featureConfidence
1.0
 Charmed (1998)
hasFeature
Forgotten Phlebotinum / int_f2041376
 Forgotten Phlebotinum / int_f6da9a18
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_f6da9a18
comment
Sgt. Frog: The Kero Ball and Angol Mois's Lucifer Spear gets used less and less each season. This gets lampshaded in the third movie - both items are lost at different points, but recovered from the wreckage during the end credits.
The 7th season of the anime attempted to reestablish the basic characters and setting of the show. As a result, both of these elements come to the forefront again. There are 3 episodes with the Keroball in the center of everything just in the first half of the season. That's more than in all of the first season!
The Lucifer Spear may be condemned to this after the earthquake of March 2011.
 Forgotten Phlebotinum / int_f6da9a18
featureApplicability
1.0
 Forgotten Phlebotinum / int_f6da9a18
featureConfidence
1.0
 Sgt. Frog (Manga)
hasFeature
Forgotten Phlebotinum / int_f6da9a18
 Forgotten Phlebotinum / int_f8956ef3
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_f8956ef3
comment
Yu Yu Hakusho
In early episodes Hiei has telepathic abilities and has the ability to transform into a more powerful demon form, which eventually disappeared. The demon form was seen again in the second movie, but it seemed less powerful than Hiei with the Black Dragon Wave. The telepathic abilities such as hypnotism still appeared in the show and manga near the ending.
Kurama has a number of really nifty tricks that show up only once, when they would have been incredibly useful at other times (such as during Round 3 of the Tournament), like the smokescreen and the Petals and Thorns attack. Many of the techniques he can use are dependent on which plant seeds he has on his person at the time, so it's possible he only has a limited number of different seed types on him at any given time.
Kuwabara showed in his first fight in a while that through training he's gained the ability to create a second Spirit Sword, manipulate his sword to extend and bend to hit opponents from long distance, and during his fight against Elder Toguro, create a colossal tennis racket-hammer thing out of the same energy; all of these abilities are never used outside the fight they were introduced in.
And to round out the quartet, Yusuke masters his teacher's secret move, the ultimate fighting technique, the Spirit Wave. He successfully uses it for the first time to beat Jin, then never uses it in battle again. He does use it offscreen once, to heal himself, but considering he has such an incredibly versatile and powerful technique at his disposal, you'd think it would come in handy more often.
 Forgotten Phlebotinum / int_f8956ef3
featureApplicability
1.0
 Forgotten Phlebotinum / int_f8956ef3
featureConfidence
1.0
 Yu Yu Hakusho (Manga)
hasFeature
Forgotten Phlebotinum / int_f8956ef3
 Forgotten Phlebotinum / int_f91de837
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_f91de837
comment
In Harry Potter and the Half-Blood Prince, the potion 'Felix felices' is introduced- an incredibly powerful good luck potion. It's very rare, and has negative long term effects, but you've got to be a little bit surprised that neither side thought to brew up some for any of the really big/dangerous stuff.
 Forgotten Phlebotinum / int_f91de837
featureApplicability
1.0
 Forgotten Phlebotinum / int_f91de837
featureConfidence
1.0
 Harry Potter and the Half-Blood Prince
hasFeature
Forgotten Phlebotinum / int_f91de837
 Forgotten Phlebotinum / int_fa46743e
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_fa46743e
comment
Star Trek: Nemesis:
At the end, all the transporters on the Enterprise fail after Picard is beamed over. Their only recourse is to have Data jump over and use a never-before-seen one-person mini-transporter badge to get Picard back and then die with the enemy ship himself. Everyone seemed to forget the shuttles have their own independent transporters. Also, the shuttlecraft themselves; they could just send Data over carrying a spacesuit and have him jump through the forcefield with Picard back to the shuttle.
The Captain's Yacht, a large auxiliary starship (attached to the underside of capital ships) that was designed for both The Next Generation and Voyager, but was never used in either series. Despite many situations where a craft like this could be useful (as it could carry more crew members, have a larger cargo area and generate tachyon bursts), the craft wasn't utilized until Insurrection (where the main cast go down in the yacht to deliver weapons to the Ba'ku) and Nemesis (where Picard arbitrarily decides to take it down to the planet where B-4's parts are located).
Writers constantly forget that phasers can be programmed to fire on their own ("The Game") and that an overloading phaser makes a passable hand grenade. Also that it's possible to beam a photon torpedo aboard an enemy ship with a transporter. Any one of these could have been used to destroy the Scimitar without requiring Data to make a Heroic Sacrifice.
 Forgotten Phlebotinum / int_fa46743e
featureApplicability
1.0
 Forgotten Phlebotinum / int_fa46743e
featureConfidence
1.0
 Star Trek: Nemesis
hasFeature
Forgotten Phlebotinum / int_fa46743e
 Forgotten Phlebotinum / int_fa5e90fd
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_fa5e90fd
comment
Crops up in City of Heroes. Interestingly, your character is often the Forgotten Phlebotinum; for example, NPCs often caution you to "be careful, these guys are dangerous!", even after your character has defeated monsters, giant robots, and demigods.
 Forgotten Phlebotinum / int_fa5e90fd
featureApplicability
1.0
 Forgotten Phlebotinum / int_fa5e90fd
featureConfidence
1.0
 City of Heroes (Video Game)
hasFeature
Forgotten Phlebotinum / int_fa5e90fd
 Forgotten Phlebotinum / int_fb9c177d
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_fb9c177d
comment
Transformers
Waspinator's Eye Beams that he shoots at Cheetor with in the Beast Wars pilot. He never uses them again in combat, even in the Season 2 opener, when Cheetor knocks his gun out of his hand and those Eye Beams would have been a nice alternative to running away. He did use them at one other time, when he and Terrorsaur (who was also using Eye Beams) were trying to cut into Tigatron's stasis pod, but as a general rule if a character on the show had that ability and wasn't named Dinobot, they only got used on very rare occasions, and got overlooked numerous times that they could have been helpful.
Transformers: Generation 1 had both sides constantly creating weapons that would be a Game-Breaker in the hands of non-idiots. Instead of being used for what they could be, they'd be used to create/stop the problem of the day, and then never be seen or heard from again. Also, the many, many, many one-shot powers displayed by individual Autobots that would never be used again. (Most iconically, the Pure Energy flail and axe used by Megs and Prime, respectively, in the series premiere only and never again.) They also suffered from No Plans, No Prototype, No Backup: If the ultimate weapon whipped up in the days since the previous episode gets smashed at the end, just making another is apparently never an option.
 Forgotten Phlebotinum / int_fb9c177d
featureApplicability
1.0
 Forgotten Phlebotinum / int_fb9c177d
featureConfidence
1.0
 Transformers (Franchise)
hasFeature
Forgotten Phlebotinum / int_fb9c177d
 Forgotten Phlebotinum / int_fbc58609
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_fbc58609
comment
A rare villain example in The Nightmare Before Christmas: Oogie Boogie has the ability to suck in everything like a gigantic vacuum, which is how he recaptured Santa and Sally. He never thought to use this in his battle against Jack Skellington.
 Forgotten Phlebotinum / int_fbc58609
featureApplicability
1.0
 Forgotten Phlebotinum / int_fbc58609
featureConfidence
1.0
 The Nightmare Before Christmas
hasFeature
Forgotten Phlebotinum / int_fbc58609
 Forgotten Phlebotinum / int_ff9ab17f
type
Forgotten Phlebotinum
 Forgotten Phlebotinum / int_ff9ab17f
comment
Star Trek: The Next Generation indulged in this far too often.
Consider the "dimensional inverter" used in the episode "The High Ground", that could transport things straight through even a Galaxy-class starship's shields (or any other shields) without trouble, but had a cumulative and lethal side effect on people who used it repeatedly. And while that's obviously a sane reason not to use it in normal service, it does nothing to explain why they didn't use it for, oh, one-way trips by inanimate objects straight through enemy starship shields... objects like armed anti-matter warheads, for example. (Or as a Plan B for when crew members are in danger on the planet but can't be beamed up due to an attack on the ship that requires them to keep their shields up or a Negative Space Wedgie that blocks the beam).
The episode "Lonely Among Us" shows how the transporter could bring the dead back to life! While the person's consciousness had been converted into energy by the being that had possessed him, the episode seems to imply that they can always re-materialize a previously saved version of a crew member.
The Galaxy class has Saucer Separation capability because the Saucer section contains the civilians, laboratories, families, etc., while the lower section contains the warp drive and primary weapon systems. It allows the civilians to be moved out of harm's way if the ship has to go into a firefight. Saucer separation was used twice in the first season of the show, and once in the season 4 premiere, but after that it was forgotten and only sometimes referred to, just to drop the idea afterwards (it was, however, used in one of the movies). The Star Trek: The Next Generation Technical Manual explains in a footnote that the writers never forgot about the Saucer Separation capability, and originally intended to use it as a fairly standard maneuver whenever the ship expected to go into trouble. However, what they discovered is that depicting the separation on screen and showing crew moving to the other set just took too much time during the episode to show fully, and not doing so was too jarring of a sudden transition. Hence, they used it sparingly (if at all) for pacing reasons. note Plus, without the saucer component the stardrive section looks very silly.
"Hero Worship" has Geordi connecting the shields to the warp drive, more than doubling their strength. Never mind the other hundred times when this would have been useful.
The transporters were remembered. The shuttles were (usually) remembered. What was not usually remembered was that the shuttles have independent transporter units of their own, separate from the ship's (they didn't in TOS, but TNG established it).
"Who Watches the Watchers" has Troi and Riker implanted with subcutaneous communicators, allowing two-way communication between themselves and the Enterprise, which only the ground team can hear. Naturally, this technology was only ever used four more times over the course of the entire franchise, despite existing as early as the 22nd Century according to Star Trek: Enterprise.
In "Rascals", a transporter accident turns some crew members into young children. To be sure, this was inconvenient at the time, but the staggering medical implications are never explored. The entire plot of Star Trek: Insurrection need never have happened if they'd just figured out how to zap people back to their twenties every time they got north of, say, fifty. Considering that they were able to reverse-engineer the accident well enough to return the crew members to their original age in the space of one episode, perfecting the treatment shouldn't have been too difficult.
An episode had Dr. Pulaski get a mutated virus that aged her. They used a stray hair from her brush and a transporter to restore her to a condition before she contracted the illness. In other words, if you keep a healthy DNA sample, you can restore someone to any age and cure any disease.
Using two beams due to interference led to the creation of a second Will Riker, completely by accident. Both were physically identical and had the same memories up until that point. Not only is it capable of cloning a person despite there being no additional mass, but there's the question of who is actually materialized, the original person or a copy?
How about Dr. Soong's having spent decades trying to hook Data up with a positronic brain capable of sentient thought, while Geordi did the same thing with one poorly-worded request in the holodeck? Oh, they tell Moriarty that they'll look into how and why it happened so they can try to figure out a way to let him leave the holodeck... and then promptly forget all about it until he shows up again seasons later. He's understandably unhappy about it.note Seeing as sapient holograms are in service just a few years later, it looks like someone did look into it. And they're given about as many legal rights as a wad of used Kleenex.
The Exocomps from "The Quality of Life" were non-humanoid robots made of off-the-shelf parts that rapidly improved themselves to the point of sentience. Despite being hugely effective and friendly (one of them performs a Heroic Sacrifice to save the heroes), they're never mentioned again.
 Forgotten Phlebotinum / int_ff9ab17f
featureApplicability
1.0
 Forgotten Phlebotinum / int_ff9ab17f
featureConfidence
1.0
 Star Trek: The Next Generation
hasFeature
Forgotten Phlebotinum / int_ff9ab17f

The following is a list of statements referring to the current page from other pages.

 Forgotten Phlebotinum
processingCategory2
Speculative Fiction Tropes
 Cardfight!! Vanguard / int_1b89151e
type
Forgotten Phlebotinum
 Doraemon / int_1b89151e
type
Forgotten Phlebotinum
 Eureka Seven AO / int_1b89151e
type
Forgotten Phlebotinum
 Guilty Crown / int_1b89151e
type
Forgotten Phlebotinum
 Mobile Suit Gundam / int_1b89151e
type
Forgotten Phlebotinum
 Mobile Suit Gundam Wing / int_1b89151e
type
Forgotten Phlebotinum
 Sailor Moon / int_1b89151e
type
Forgotten Phlebotinum
 Space Battleship Yamato / int_1b89151e
type
Forgotten Phlebotinum
 Speed Racer / int_1b89151e
type
Forgotten Phlebotinum
 The Mysterious Cities of Gold / int_1b89151e
type
Forgotten Phlebotinum
 Xabungle / int_1b89151e
type
Forgotten Phlebotinum
 Zambot 3 / int_1b89151e
type
Forgotten Phlebotinum
 JLA/Avengers (Comic Book) / int_1b89151e
type
Forgotten Phlebotinum
 Calvin and Hobbes (Comic Strip) / int_1b89151e
type
Forgotten Phlebotinum
 Maximum Carnage / Comicbook / int_1b89151e
type
Forgotten Phlebotinum
 Christian Humber Reloaded / Fan Fic / int_1b89151e
type
Forgotten Phlebotinum
 Marissa Picard / Fan Fic / int_1b89151e
type
Forgotten Phlebotinum
 A Angle Is With Us (Fanfic)
seeAlso
Forgotten Phlebotinum
 One Punch Gamer (Fanfic) / int_1b89151e
type
Forgotten Phlebotinum
 Blade Trilogy / int_1b89151e
type
Forgotten Phlebotinum
 The Phantom Menace / int_1b89151e
type
Forgotten Phlebotinum
 Star Trek (Franchise) / int_1b89151e
type
Forgotten Phlebotinum
 Campione! / int_1b89151e
type
Forgotten Phlebotinum
 The Familiar of Zero / int_1b89151e
type
Forgotten Phlebotinum
 Arabian Nights / int_1b89151e
type
Forgotten Phlebotinum
 Castle Perilous / int_1b89151e
type
Forgotten Phlebotinum
 Inheritance Cycle / int_1b89151e
type
Forgotten Phlebotinum
 Kaiketsu Zorori / int_1b89151e
type
Forgotten Phlebotinum
 The Hunt for Red October / int_1b89151e
type
Forgotten Phlebotinum
 The Mortal Instruments / int_1b89151e
type
Forgotten Phlebotinum
 The Three Musketeers / int_1b89151e
type
Forgotten Phlebotinum
 Console RPG Clichés 121 to 144 / int_1b89151e
type
Forgotten Phlebotinum
 ForgottenSuperWeapon
seeAlso
Forgotten Phlebotinum
 Batman (Manga) / int_1b89151e
type
Forgotten Phlebotinum
 Doraemon (Manga) / int_1b89151e
type
Forgotten Phlebotinum
 Kinnikuman (Manga) / int_1b89151e
type
Forgotten Phlebotinum
 Magical Record Lyrical Nanoha Force (Manga) / int_1b89151e
type
Forgotten Phlebotinum
 Sgt. Frog (Manga) / int_1b89151e
type
Forgotten Phlebotinum
 Touhou Bougetsushou (Manga) / int_1b89151e
type
Forgotten Phlebotinum
 Yu Yu Hakusho (Manga) / int_1b89151e
type
Forgotten Phlebotinum
 We Have All Become Pokémon (Roleplay) / int_1b89151e
type
Forgotten Phlebotinum
 Battlestar Galactica (2003) / int_1b89151e
type
Forgotten Phlebotinum
 Blake's 7 / int_1b89151e
type
Forgotten Phlebotinum
 Captain Scarlet and the Mysterons / int_1b89151e
type
Forgotten Phlebotinum
 Charmed (1998) / int_1b89151e
type
Forgotten Phlebotinum
 Choujin Sentai Jetman / int_1b89151e
type
Forgotten Phlebotinum
 Ghostwriter / int_1b89151e
type
Forgotten Phlebotinum
 Hercules: The Legendary Journeys / int_1b89151e
type
Forgotten Phlebotinum
 Kamen Rider Kabuto / int_1b89151e
type
Forgotten Phlebotinum
 Kyoryu Sentai Zyuranger / int_1b89151e
type
Forgotten Phlebotinum
 MythBusters / int_1b89151e
type
Forgotten Phlebotinum
 Photon / int_1b89151e
type
Forgotten Phlebotinum
 Power Rangers S.P.D. / int_1b89151e
type
Forgotten Phlebotinum
 Star Trek: Enterprise / int_1b89151e
type
Forgotten Phlebotinum
 Star Trek: Voyager / int_1b89151e
type
Forgotten Phlebotinum
 Stargate Atlantis / int_1b89151e
type
Forgotten Phlebotinum
 The Greatest American Hero / int_1b89151e
type
Forgotten Phlebotinum
 The Orville / int_1b89151e
type
Forgotten Phlebotinum
 Time Trax / int_1b89151e
type
Forgotten Phlebotinum
 Ultraman Ginga / int_1b89151e
type
Forgotten Phlebotinum
 War of the Worlds (1988) / int_1b89151e
type
Forgotten Phlebotinum
 Bubble Bobble (Video Game) / int_1b89151e
type
Forgotten Phlebotinum
 Dead Space 3 (Video Game) / int_1b89151e
type
Forgotten Phlebotinum
 Freelancer (Video Game) / int_1b89151e
type
Forgotten Phlebotinum
 Mega Man Star Force (Video Game) / int_1b89151e
type
Forgotten Phlebotinum
 Metal Gear 2: Solid Snake (Video Game) / int_1b89151e
type
Forgotten Phlebotinum
 Rise of the Reds (Video Game) / int_1b89151e
type
Forgotten Phlebotinum
 Snatcher (Visual Novel) / int_1b89151e
type
Forgotten Phlebotinum
 The Princess Planet (Webcomic) / int_1b89151e
type
Forgotten Phlebotinum
 Aventures (Web Video) / int_1b89151e
type
Forgotten Phlebotinum
 Overused Sci-Fi Silly Science (Website) / int_1b89151e
type
Forgotten Phlebotinum
 Birdman
seeAlso
Forgotten Phlebotinum
 Disenchantment / int_1b89151e
type
Forgotten Phlebotinum
 Filmation's Ghostbusters / int_1b89151e
type
Forgotten Phlebotinum
 Jackie Chan Adventures / int_1b89151e
type
Forgotten Phlebotinum
 Loonatics Unleashed / int_1b89151e
type
Forgotten Phlebotinum
 Potsworth & Company / int_1b89151e
type
Forgotten Phlebotinum
 ReBoot / int_1b89151e
type
Forgotten Phlebotinum
 Sherlock Holmes in the 22nd Century / int_1b89151e
type
Forgotten Phlebotinum
 Star Trek: The Animated Series / int_1b89151e
type
Forgotten Phlebotinum
 Teenage Mutant Ninja Turtles (2003) / int_1b89151e
type
Forgotten Phlebotinum
 The Dreamstone / int_1b89151e
type
Forgotten Phlebotinum
 The Flintstones / int_1b89151e
type
Forgotten Phlebotinum
 The Nightmare Before Christmas / int_1b89151e
type
Forgotten Phlebotinum
 Winx Club / int_1b89151e
type
Forgotten Phlebotinum
 Digimon Xros Wars / int_1b89151e
type
Forgotten Phlebotinum
 Wizards of Waverly Place / int_1b89151e
type
Forgotten Phlebotinum