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Mars Needs Water
- 136 statements
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| Mars Needs Water | comment |
One of the more common flavors of Planet Looters, in this case aliens are after one specific resource that Earth certainly has in abundance, water. Realistically, invading Earth isn't a smart way to get water as there are a variety of other more easily accessible locations in space. All comets and a variety of asteroids, moons, and even large, interstellar clouds have water in great abundance and are much more accessible and easy to harvest than Earth, as well as lacking those pesky hairless apes. (For instance, Europa has a water ocean 60 miles deep). Occasionally, this will be justified (or handwaved) through an explanation that Earth's water somehow has some quality that other sources lack. Ironically, Mars itself has been discovered to have water in Real Life as of 2015. Examples |
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| Mars Needs Water / int_1c7b4c37 | comment |
In the film adaptation of Ender's Game, Colonel Graff suggests that the Formics wanted to invade Earth for water, which their desert-like homeworld doesn't appear to have much of. Though they do attack a fleet of Formic ships harvesting ice from a gas cloud at one point. Note that this was not even discussed in the book, the theory there was that they were trying to colonize. | |
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The second scene of The Expanse has an OPA speaker claiming that Ceres was once covered in ice, but Earth and Mars have stripped it away leaving the Belters dependent on water shipments from Saturn.note Ceres as a whole is about 25% water, so it actually has more water than Earth, but it's possible that technology in the setting isn't advanced enough to economically access the deeper water. The loss of the ice freighter Canterbury to what seems to be a Martian attack spark riots throughout the Belt. | |
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In V (1983), the Visitors are after Earth's water, and the fact that humans are delicious too doesn't hurt. The Novelization has a justification; in this Verse, the industrial effort of interstellar space development irreversibly destroys biospheres, and they have been unable to develop water purification technologies capable of efficiently supporting millions, let alone billions of people. Thus, the resulting empires are not only constantly fighting over whatever relatively pure water remains, but food as well; maybe they could harvest water from undefended comets (after filtering out twenty percent of their weight in ammonianote Though in real life, ammonia is actually a very useful chemical, to the point that there's an entire industrial process for making it. If anything, the ammonia in comets should make them more attractive to a spacefaring society.), but a life-sustaining world which not only has over a quadrillion tons of fairly clean water but four and a half billion two-hundred-pound food animals too stupid to colonize space themselves? The planet looks like a buffet table guarded by illiterate street punks. And the Visitors have Slow Lasers... which happen to be fusion powered and need heavy water as fuel. note Heavy water has deuterium instead of regular hydrogen - about 115 in every million water molecules are heavy, regardless of where the water comes from, so they could use space-harvested water for that and for at least some industrial stuff. But where's the fun in that? | |
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Lampshaded in Plan 7 of 9 from Outer Space (along with a number of other B-Movie explanations) as to the motives of the alien invaders. | |
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| Mars Needs Water / int_33dd1d90 | comment |
Downplayed in Half-Life 2. When close to some docks, if the player looks really close, they can notice that the dock isn't anywhere close to the shore, implying that there's less water in the ocean than before. Word of God also states that The Combine have placed a giant portal at the bottom of Earth's oceans, which is sending the water to other Combine-conquered worlds. However, the secondary purpose was terraforming. | |
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Seemingly inverted in Oblivion (2013) where humanity is trying to drain the Earth's water as fuel for fusion in preparation for a Homeworld Evacuation. Until it turns out that the protagonist is a cloned slave unwittingly helping an alien machine drain the oceans and kill what's left of humanity. | |
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A Calvin and Hobbes strip parodies this with a poem Calvin wrote about a flying saucer stealing the Earth's water and air, which ends in a heavy-handed Green Aesop by comparing this to human destruction of the biosphere. | |
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The Marvels (2023): After a civil war wreaked ecological disaster on Dar-Benn's homeworld of Hala, she leads her army of Kree to invade other planets and steal their resources. To this end, she attacks Tarnax for its air, Aladna for its ocean, and Earth for its Sun. However, it's made clear that Dar-Benn could've taken from any uninhabited planet, but specifically targeted these populated worlds as revenge on Captain Marvel. | |
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Discussed in Grrl Power — as Dabbler points out, invading Earth and dealing with its nukes would be unnecessarily difficult compared to finding some anonymous undefended comets and mining those. | |
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In Flash Gordon (2007), Mongo's water supply was contaminated by a nuclear accident and Ming uses the last pure well on the planet to control the various peoples of Mongo. Unfortunately it's running dry, so he turns to Earth. | |
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Steven Universe Played with in "Ocean Gem": Lapis Lazuli steals the Earth's oceans, but not for any chemical use — she wanted to get back to her home planet, and thought using her super-powerful hydrokinesis to build a Star Scraper was the best option. It still wasn't nearly enough. Inverted by the Gem Homeworld: They tried to colonize Earth for its minerals, physically consuming the planet's mass, but water seems to be one of the few materials they don't want. Homeworld has no rain, a graphic shows a fully colonized Earth would have no oceans, their biology requires no water, and the Diamond Authority's "extraction chamber" is the only machine that's show using any. They even appear to have created Lapis Lazuli's caste just to use that water for terraforming (via ripping the surface of the planet apart) before disposing of it. |
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In an episode of Doctor Snuggles called "The Remarkable Fidgety River", a race of aliens are stealing cubes of water from the ocean and taking them to their home planet. It turns out to be subversion, however, as the aliens meant no harm — they thought the water was rubbish because it had so much garbage in it. When Snuggles explains that the plants and animals on Earth need the water, the aliens promptly agree to give it back. | |
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Battle: Los Angeles: The alien invaders seem to be sucking up the oceans. While little detail is given on what the aliens truly want, they leave the impression that the water is more a convenient resource to be exploited, not necessarily the entire reason they are on the planet. Like arriving at a new battlefield and supplementing your existing forces with local materials. | |
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Downplayed in Animorphs. In the third book the kids see the Yeerks regularly send down supply ships to retrieve water and oxygen for their ships in orbit, but it's not the main reason for their invasion. | |
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War of the Worlds: Global Dispatches. One character comes across a Martian staring rapt at a flowing stream, implying this trope as one of the reasons why the Martians invade Earth. In this case it would be a Justified Trope as the Martians are seeking to conquer a resource-rich planet for colonization, rather than just take the water back with them. | |
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The Ice Pirates: While it's not an invasion that's the key to the movie, water is indeed the most valuable substance in the universe to the point of being the movie's MacGuffin. | |
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The people of Planet X's objective in conquering Earth in Invasion of Astro-Monster. | |
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An episode of Team Galaxy called "H2-Oh No!" featured an aquatic race stealing water from various planets because their own planet is in a system that has six suns, which constantly evaporate the planet's water supply. | |
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A variation in It! The Terror from Beyond Space. An autopsy shows that a victim of the monster was dehydrated of water and every other fluid, and the crew speculate that the creature has to take on water by feeding on smaller creatures that collect water from the soil of a barren Mars. | |
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Inverted in Battlestar Galactica (2003) where it's the humans who need water, after the water recycling tanks on the Galactica are sabotaged. The problem is finding an ice-bearing asteroid or planet when you are in interstellar space. | |
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The invading aliens in The Faculty are an aquatic species that needs a lot of water and whose original planet dried up. One sign that someone is infected by the Puppeteer Parasite is a need to drink lots of water, and dehydrating them quickly via a special drug based off caffeine pills turns out to be a means of killing them quickly. | |
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One spotlight challenge on Face/Off required the creation of aliens whose home planets are in great jeopardy. Naturally, one of the planets is running out of water. | |
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While this isn't confirmed in-story during War of the Worlds (2005), director Steven Spielberg told Newsweek magazine in an interview that the aliens might be attacking for water. | |
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The backstory of Alani from Battleborn involves this trope. Rendain decided to drain Alani's freshwater ocean planet of Akopos for a Jennerit reservoir fleet. | |
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In the pilot episode of Star Trek: Voyager, "Caretaker", the Kazon-Ogla seek water because they're in a region of space without it, thanks to the environmental disaster inadvertently caused by the Caretaker. The crew of Voyager agree to trade water for information on the region, but unwisely explain that they can create water with their amazing replicator technology that the Kazon spend the next two years trying to get their hands on. | |
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