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1->'''Morty''': I didn't know that there were bugs out in space.²->'''Rick''': Well, what did you think, Morty? Life just developed on Earth by itself?²-->-- ''WesternAnimation/RickAndMorty'', "Look Who's Purging"²²Lots of people wonder about the origins of life on Earth. Were we placed here by a benevolent god? Did we arise out of a primeval soup of microbes? If the former is the case--well, why? And who? And how? And if it's the latter, how exactly did the vast chemical stew of hydrocarbons and proteins somehow get together and become self-replicating? And then how did those cute little squirmy germs grow and change and evolve enough to become, well, us?²²Some stories attempt to answer these questions. But others decide to skirt this touchy ontological issue entirely, by bringing into it a different element: Outer space.²²In other words, they propose that life ''on'' Earth is not ''of'' this earth.²²''Panspermia'' ([[HehHehYouSaidX get your mind out of the gutter]]) is a scientific idea which proposes that life on Earth [[{{Pun}} came]] to it from outer space, as aliens. This is a real scientific hypothesis, mind you. It's considered very unlikely, but not so much so that supporting it necessarily makes you a crackpot. ([[Wiki/{{Wikipedia}} That Other Wiki]], of course, [[http://en.wikipedia.org/wiki/Panspermia has plenty of information.]]) This isn't the "LittleGreenMen"-style of alien, either. We're talking more along the lines of "cosmic pond scum hitching a ride in some water vapor in a comet." In ''fiction,'' panspermia (or exogenesis, which is similar but not identical) tends to gravitate toward the former, though--that aliens of some kind were actually the origin for life on Earth, or some other planet.²²In fiction, this idea tends to pop up in one of two forms:²²* '''Literal panspermia and/or exogenesis.''' Microbes from space landed on Earth (or another planet, in more sci-fi oriented settings), and evolved into the lifeforms that now populate that planet. This can be used both to get around the idea of having to answer how life arises in the first place, or as [[HandWave a justification]] for the similarities between life forms on very different planets.²* '''"Alientelligent Design."''' {{Sufficiently Advanced Alien}}s, {{Precursors}} or {{Ancient Astronauts}} planted either the seeds for life or primitive multicellular lifeforms on a planet to begin with, and, depending on the type of alien, either left them to their own devices or "guided" their evolution in a large-scale GambitRoulette.²²Frequently, this as used as part of a {{Reveal}}, and can lead to [[ContemplateOurNavels navel-gazing.]] Occasionally leads to MarsNeedsWomen, in cases of ''literal'' panspermia. See also TransplantedHumans, which is this trope in reverse (alien life coming from Earth); and HumanityCameFromSpace, which is only about the human species being extraterrestrial in origin.²²It may be worth noting that while this theory may offer an explanation for how life got its start ''on Earth'' (and/or other relevant planets), it ultimately does not in and of itself answer the question how life arose wherever and whenever it did so for the ''first'' time.²²'''Due to its nature as part of TheReveal, examples for this trope are frequently full of spoilers. Be warned.'''²----²!!Examples:²²[[foldercontrol]]²²[[folder:Anime & Manga]]²* In ''Anime/NeonGenesisEvangelion'', Humanity (indeed, all life on Earth), and Angels were both created by {{Sufficiently Advanced Alien}}s who had a thing for spreading life all over the galaxy. Don't believe me? Its AllThereInTheManual.²** [[spoiler:The progenitor of Earth-like life is a type of alien called a "Lilith," while the progenitor of Angel-like life is a type of alien called an "Adam." Many copies were spread throughout the known universe in order to seed life toward an unknown purpose.]]²** [[spoiler:Also, Earth was meant to be inhabited by Angels, but before they hatched from Adam, the {{Sufficiently Advanced Alien}}s screwed up and accidentally crash-landed Lilith on the planet, resulting in Adam's Lance of Longinus activating and putting him in stasis. Then came the Katsuragi expedition...]]²* Life on Earth was manipulated by the Creators/Advent/Uranus in ''Manga/{{Guyver}}'' as part of their goals to create a powerful bio-weapons platform. Humanity was the end result, a base form that could be adapted into specialised combatants like Zoanoids and Zoalords. The experiment was aborted near completion when they gave a base level human one of the bio-armour units that worn by the Creators themselves and it turned out not only far more powerful than expected but completely immune to their telepathic control.²* In ''Anime/SuperDimensionFortressMacross'' both humans and giant humanoid Zentradi are stated to be descended from an extraterrestrial race of {{precursors}} called the "Protoculture". Subsequent ''Anime/{{Macross}}'' series go on to imply that ''all'' intelligent humanoid species in the Milky Way are "Children of the Protoculture".²* ''Anime/{{Pokemon}}'' are alleged to have come from ''somewhere'' in outer space...[[EarlyInstallmentWeirdness early on]]. This hypothesis from the first generation was quickly dropped in all subsequent generations, to the point that we eventually meet Pokemon that created the earth, the physical universe, and all of time and space. In other words, the series progressed from panspermia to intelligent design. [[MindScrew Try to make sense of that]].²* In ''Anime/AndromedaStories'', earth is seeded with life when the twins Jimsa and Affle crash land and perish after escaping the destruction of their homeworld, located in the Andromeda galaxy.²[[/folder]]²²[[folder:Comic Books]]²* The Polish comic series from the 80s, ''Expedition'' told the story of how {{Sufficiently Advanced Alien}}s come to Earth and help apes evolve in their image, creating the basis for several religions and mythologies in the process.²* ''Comicbook/DCComicsPresents'' #1-2 has an alien race whose {{Living Ship}}s' exhaust was microscopic organisms that started life on both Krypton and Earth, among other planets. (This story has been reprinted because it's also a Superman/Flash race.)²* One [[Comicbook/TheAuthority Authority]] story had the team face off against an alien life-form the size of the moon -- "the closest thing to God" that had "planted" life millions of years ago. Subverted in that life on the planet didn't develop as it should have, leading to, among others, the rise of humanity.²[[/folder]]²²[[folder:Film]]²* This was TheReveal of the science fiction movie ''Film/MissionToMars.''²* ''Film/TwoThousandOneASpaceOdyssey'' - The aliens didn't necessarily seed Earth, but most definitely influenced the evolution of mankind.²* In the Creator/MarkHamill film ''Laserhawk'', aliens seeded life on Earth so they could come back millions of years later and harvest us for food. There is another race whose goal is to sabotage these seeding efforts. They attempt to do so on Earth but fail.²* The opening scene of ''Film/{{Prometheus}}'' shows an alien sacrificing himself in order to seed the earth with his DNA. [[TheWalrusWasPaul At least, that's what we think was going on there.]]²[[/folder]]²²[[folder:Literature]]²* The backstory of the Literature/{{Lensman}} novels states that all life in Earth's galaxy (and I believe the Second Galaxy as well) came from Arisian spores. Mentor tells at least one Lensman that this is why he's offering the Lens to the Galactic Patrol -- they're "family".²* This appears to be the case in Creator/DanBrown's ''Literature/DeceptionPoint''. [[spoiler:It's actually a conspiracy to get NASA back up on its feet.]]²* The Literature/{{Hainish}} stories by Creator/UrsulaKLeGuin used this trope for human and semi-human life, spread by the {{Precursors}} in the title.²* The more scientific sort is a suggested origin of all life in the Literature/CoDominium universe (at least until ''Literature/TheMoteInGodsEye'' introduces truly ''alien'' aliens.)²* ''Literature/{{Animorphs}}'':²** The Ellimist (an extremely powerful LastOfHisKind god-like being) seeded many planets with life during his war with his EvilCounterpart Crayak. This included custom-making the Pemalites and giving them a mission to spread life across the galaxy themselves. Crayak also created his own species--the Howlers.²** Also, several Earth vegetables were apparently imported by crab people during the Cretaceous period.²* This is alluded to -- and it's all the more memorable because it comes out of freakin' ''[[BigLippedAlligatorMoment nowhere]]'' (it's very against the grain of the overall tone of the novels)- in the ''Literature/QuintaglioAscension'' trilogy. Turns out that there was a ridiculously powerful species that lived in the universe that existed before this one (stay with me), all but one died when the universe we know was formed, and that one last being seeded different planets with life forms -- from Earth, which is the only planet where life formed naturally. Heady stuff.²* Creator/LarryNiven has done this at least twice. In his ''Literature/KnownSpace'' future history, nearly all alien species evolved from food yeast grown to feed the Thrint and their subjects. Then, about 3 million years ago, a species called the Pak colonized the Earth and became ''Homo habilis''.²* ''Literature/TheHitchhikersGuideToTheGalaxy'' reveals what Earth ''really'' is. It is implied though that no organism on Earth is older than a few million years, and was likely brought in from other places. And, furthermore, humanity is [[spoiler:the descendants of middle-men who crashed here 2 million years ago, completely unplanned by Earth's architects]].²* Literature/{{Discworld}} example: In ''Discworld/{{Eric}}'' Rincewind drops a sandwich in a tide-pool and the narrator wonders what life would have been like with mustard rather than mayonnaise.²* The Darkness from Michael Grant's ''Literature/{{Gone}}'' is an alien virus that was riding a meteorite when it crashed into Earth -- specifically a nuclear plant, which caused it to rapidly mutate and somehow become a mind-devouring god-like being.²* At the end of ''Literature/LastAndFirstMen'' the solar system is about to be destroyed by increasing radiation from the sun. The Last Men devote their remaining time to sending out [[ScienceMarchesOn "the germs of life"]] on the solar wind.²* This was part of TheReveal in Creator/HPLovecraft's ''Literature/AtTheMountainsOfMadness''; it turns out that [[spoiler:all Earthly life evolved from microbes that the Old Ones planted here. For food.]]²* In Sergey Lukyanenko's ''Literature/ALordFromPlanetEarth'', it is common knowledge among HumanAliens (no StarfishAliens) that life on all of their planers began with intentional panspermia by the mysterious [[{{Precursors}} Seeders]], who also left behind numerous LostTechnology and temples on each planet ([[spoiler:except for Earth]]). What they don't know is that the Seeders are, in fact, [[spoiler:humans from the future, who need an army but do not have the time for a massive breeding program. They send autonomous seeder ships into distant past to spread life and leave behind carefully-selected pieces of technology to accelerate the development of these cultures. They also choose planets in unexplored systems in order to avoid any temporal paradox and ensure that their "children" are unable to get to Earth via conventional means before the time is right]].²* One of the novels in Mikhail Akhmanov's ''Literature/TheHistoryOfTheGalaxy'' series reveals that biological life in the galaxy (possibly, the Universe) is an unintentional side-effect of an {{Energy Being|s}}'s attempts to survive. The being was "born" in the magnetic fields of a gas giant but foresaw that its homeworld would eventually die. In order to escape, it created artificial proto-plasmic semi-sentient creatures called Forerunners. They would travel through space and spread the {{Energy Being|s}} to other compatible gas giants. The Forerunners were themselves mostly energy, but parts of them were organic and composed of rudimentary [=DNA=] (how else do you program an organism to do something?). Over billions of years, the Forerunners spread through the galaxy and, possibly, beyond. Some of them died, and their remains ended up on planets, unintentionally starting the process of life. This, of course, raises more questions than it answers, such as how the {{Energy Being|s}} came to be, and how it was able to create a semi-biological organism.²* Not Earth per se, but with all the life in that galaxy far, far away, the Franchise/StarWarsExpandedUniverse must use this trope. The {{precursors}} have definitely created the Corellian system, and a cluster of black holes known as the Maw.²** It's actually that most sentient life colonised most of the habitable planets in the Galaxy for so long, people aren't completely sure of its origins, but Coruscant is suspected to be the homeworld of most Humans, along with most other Humanoid deviations. Most Planets do seem to have their own native species on them, so it's not COMPLETELY Panspermia.²*** The Celestials definitely made the Corellia System artificially, though the exact details of their influence, origins, and status as resident Sci-Fi Creator Gods are in question.²*** The Celestials [[spoiler: are actually the first force users, or at least, members of the celestials were the first force users, the Father, the Daughter, and the Son. With the help of the Kilik Race, they created the Maw black hole cluster and Corellia in order to contain "The Mother," aka Aboleth.]]²* This is raised as a possibility in Creator/RobertCharlesWilson's ''Literature/{{Spin}}'' by Jason Lawton, who theorizes that the Hypotheticals' slow migration throughout the galaxy for billions upon billions of years has resulted in unintentional seeding of habitable planets with life. Given that the Hypotheticals are fully capable of creating brand-new worlds capable of supporting life and full of "natural" resources, this is not unlikely.²* Creator/NancyKress's ''{{Literature/Crossfire}}'': This is (or at least is suggested to be) the reason why planets around nearby stars have DNA-based life. Which tends to make things easier for settlers. However, it's shown not to be universal when a plant-like, spacefaring alien species is encountered which is ''not'' DNA-based.²* Creator/IsaacAsimov's ''Literature/ExtraterrestrialCivilizations'':²** (DiscussedTrope) Life on Earth was begun by spores traveling through the universe is the next theory advanced after spontaneous generation of life is discarded. It, in turn, is also discarded, because of the complications required for such microscopic life to both survive the trip to a second planet in a new solar system and the fact that it merely displaces "how does life originate?" to a different planet.²** A footnote describes how Fred Hoyle has advanced the theory that comets, approaching close enough to Earth's orbit, are the source of viral pandemics.²* Creator/BeckyChambers' ''Literature/ToBeTaughtIfFortunate'' follows a group of astronauts ecologically surveying four planets in the twenty second century. Life is known to be common in this universe, but its origins are murky. On Earth, all cells have a chiral preference (left-handed amino acids and right-handed sugars.) However because both types of amino acids and sugars occur evenly when whipped up in the lab, there are two possibilities: 1. Chiral preferences are a necessity for life or 2. Life originated from a meteorite slamming into Earth, which happened to have mostly left-handed amino acids. On their last planet, they discover single cellular life that has no chiral preference. Which means life uses whatever is on hand, and so life on Earth very probably originated from off-world ingredients.²[[/folder]]²²[[folder:Live-Action TV]]²* Franchise/StargateVerse:²** The Ancients are a race of AdvancedAncientHumans that originated as a splinter faction of the Ori and emigrated to the Milky Way millions of years ago, using their technology to create life in human form in the Milky Way and Pegasus galaxies (on multiple planets in Pegasus, on Earth alone in the Milky Way; the Goa'uld started raiding Earth and [[TransplantedHumans creating slave colonies elsewhere]] way later). [[spoiler:They also inadvertently created the Wraith in Pegasus and were driven out of the galaxy by them.]] The Ori appear to have done the same in their home galaxy, probably where the Ancients got the idea.²** The Asgard appear to have evolved independently, though, despite the fact that their original form (seen only once) is very similar to that of the humans. It was the millennia of {{cloning|Blues}} that resulted in CloneDegeneration (apparently, keeping the original [=DNA=] on file is beyond a race of {{Sufficiently Advanced Alien}}s).²* ''Franchise/StarTrek'':²** In the 6th season ''Series/StarTrekTheNextGeneration'' episode "The Chase," it's revealed that the first starfaring species, which emerged 4 billion years ago, was so lonely that they seeded the entire Milky Way galaxy with a "genetic program" which would cause emerging life to, eventually, evolve into a form that physically resembled them. Since such a genetic program would likely herd all the different planets' developing genomes along the same narrow path, it actually makes sense that all humanoid species would be genetically similar enough to interbreed.²** The ''Series/StarTrekVoyager'' episode "Year of Hell" establishes that life on several planets in the Krenim sector is the result of the same comet passing through their orbits in distant past.²** Subverted in the ''Series/StarTrekTheOriginalSeries'' episode "Return to Tomorrow" where an alien, Sargon, says that the human race may have developed from a colony of his people. The ship's astrobiologist rejects that, citing that there is a vast amount of evidence showing that humans evolved independently on Earth. Spock, however, realizes that may actually fit with the origin of ''Vulcans''. To be fair, it was something that Sargon's species tended to do, and he had no information whether Earth or Vulcan specifically were colonized in this way.²* In ''Series/DoctorWho'', the Time Lords were one of the earliest races to evolve, and they either seeded the universe with their genetic material or affected the fundamental properties of the universe itself, so it's not that Time Lords are humanoid, but humans are "Time Lord-oid."²* ''Series/RedDwarf'' inverts this trope. Every single lifeform encountered, no matter how alien, is ultimately of Earthly origin. The first novelisation even claims that it has been proven that no other life exists in the Universe, although exactly how you can prove this isn't clear.²** In series XI the crew talk with the Universe itself who backs this by expressing regret over only bothering to make one planet with life on it during its mid-life crisis.²* In the final episode of ''Series/SpaceAboveAndBeyond'' it was revealed that the aliens evolved from Earth bacteria that was deposited on their moon through panspermia.²* In perhaps its biggest predictive stretch, an episode of ''Series/LifeAfterPeople'' proposed that this could happen to Europa, one of Jupiter's moons, which is believed to have water oceans. With no humans left to direct it, a deep-space probe crashes there and introduces Earth bacteria to these oceans, which gradually give rise to an entire complex aquatic biosphere.²* Referenced in ''Series/BabylonFive''. An early episode states that the Centauri ''claimed'' at FirstContact that they and humans had a common origin, but DNA testing by the humans proved they weren't related. Centauri Ambassador Londo Mollari blames this on a clerical error.²[[/folder]]²²[[folder:Music]]²* On the ''Music/{{Ayreon}}'' album ''01011001'', it is revealed that a technologically advanced race of fish aliens seeded a passing asteroid with their DNA, which then collided with earth--exterminating the dinosaurs already present there and allowing humans to flourish. They then directly tamper with human evolution and technological progress.²[[/folder]]²²[[folder:Tabletop Games]]²* ''TabletopGame/{{Traveller}}'', to some extent, as a means of explaining why Humans and Earth-Like life is everywhere.²* In ''TabletopGame/MagicTheGathering'', the plane of Mirrodin was created by Karn. He didn't put life on the plane, though. Memnarch, a creation of Dominaria's Mirrari, did. All that life is from other planes. However, [[NiceJobBreakingItHero Karn is responsible for some inhabitants of Mirrodin]]. [[spoiler:The Phyrexians are back.]]²[[/folder]]²²[[folder:Video Games]]²* In ''VideoGame/FossilFighters,'' it is eventually revealed that [[spoiler: multicellular organisms were created on Earth in order to be "guided in evolution" to recreate a lost race. Of course, things went wrong, creating humans instead of proper LizardFolk.]]²** And in the end, [[spoiler: it turns out subverted: All the creatures the [[LizardFolk dinaurians]] planted died out. Humans and everything else evolved out of Earth's natural life forms after all.]]²* ''VideoGame/{{Spore}}'' uses the proper definition of the theory. That is, alien bacteria hitching a ride on a rock to a different planet. This is the opening animation for the cell stage (the first stage). This was added to avoid answering the always difficult (and for now unanswerable) question of how life actually arose. And also to try to explain why all life in the universe is made of the same handful of parts.²* ''VideoGame/{{Xenogears}}'' - life on the planet was created by [[spoiler:an intergalactic war machine, to be harvested later for spare parts.]]²** Though it does have ''some'' native life forms, as evidenced by Balthasar's paleontological studies. While their planet's fossil record goes back millions of years, no evidence of humans or related beings can be found any further back than ten thousand.²* The BigBad reveals this during his HannibalLecture at the end of ''VideoGame/XCOMUFODefense'', in an attempt to convince humanity that they should work together. Since the aliens have spent the entire game trying to brutally subjugate and murder the human race, and the aliens have been observed studying humanity as if they had no idea about our species, the point is pretty easily disproven. And then your soldier blows him up.²* The [[AbusivePrecursors H'riak]] in ''Videogame/AlienLegacy'' are a violent race whose goal is to seed the galaxy with violet life that attacks anything not related to the H'riak. The Centaurians and the Empiants are the two known examples of their work, and this is the reason why the Centaurians attacked Earth the moment they found it. The Empiants were, actually, a failed experiment at creating life that can survive in a gas giant.²* Not life per se, but human evolution is this way in ''VideoGame/ChronoTrigger'': "Grown like farm animals, waiting for the slaughter. All our history, all our art and science, all to serve the needs of that... beast."²* In both the [[VideoGame/SuperRobotWarsCompact Pact]] and subsequent [[VideoGame/SuperRobotWarsOriginalGeneration OG]]-verses of the ''VideoGame/SuperRobotWars'' metaseries, all life in the universe was actually created by an ancient lost civilization originating on Earth, handily justifying the numerous invading HumanAliens that appear as antagonists. Strangely, other continuities, such as ''VideoGame/SuperRobotWarsJudgment'' feature Earth life being created by aliens, which they're going to have a hell of a time working into the OG-verse.²* Mentioned after studying the body of a [[TheGreys Reticulan]] as a proposed reason for their amazing similarity to human biology in ''VideoGame/UFOAftermath''.²* In ''Franchise/{{Halo}}'', the Forerunners believed [[AbusivePrecursors the Precursors]], a hyper-advanced race originating outside of the Milky Way, were responsible for seeding lifeless planets and speeding up the evolutionary process on planets that already had life.²** Confirmed in ''Silentium'', ''Mythos'' and ''Warfleet''. The Precursors explored the universe for ''billions'' of years and seeded countless galaxies with the building blocks of life and sped up the evolutionary processes of certain species. It may actually go further than that as ''Silentium'' heavily implies that the Precursors didn't just create life throughout the universe but that they ''created the universe itself''.²* In the ''VideoGame/{{Polycon}}'' mod for ''VideoGame/EVNova'', the [[AbusivePrecursors Takari]] created the Polyconians to terraform worlds for Takari use, intending to later employ a "killswitch" virus to exterminate them. Unfortunately for them, some of the Polyconians survived, while the virus jumped species and wiped out the Takari instead.²* ''VideoGame/CorpseOfDiscovery'' sees humanity accidentally seeding an alien world (that may or may not be Earth) after the death of several explorers cultivates new life.²[[/folder]]²²[[folder:Western Animation]]²* According to the ''WesternAnimation/SouthPark'' episode "Cancelled", all life on Earth is one big intergalactic RealityShow, in which different species from other planets had been brought together for the amusement of the viewing public.²* In the "Bolero" segment of ''WesternAnimation/AllegroNonTroppo'', life on a planet ([[EarthAllAlong maybe Earth]], maybe not) evolves from the gunk at the bottom of an astronaut's discarded Coca-Cola bottle.²* In ''WesternAnimation/Ben10Omniverse'', it's revealed that the universe itself was created by a race of SufficientlyAdvancedAliens from the fifth dimension called the Contemelia, and all life in it arose from a race of unicellular aliens working with them called Slimebiotes.²* Maury from ''WesternAnimation/BigMouth'' claims that life in Earth started when a giant alien had sex with a hole in the ground.²[[/folder]]²²[[folder:Real Life]]²* It's ''possible'' life on Earth started that way, but as of right now there is no solid evidence of life anywhere else in the universe for that life to have come from.²* It has been pointed out that if life on Earth ''did'' arrive this way, it still doesn't provide us any answers as to the ''origin'' of life - it just displaces where it originated from in the first place.²** A [[http://www.nature.com/news/how-life-emerged-from-deep-sea-rocks-1.12109 fairly convincing model]] of how the first cells might have formed on earth doesn't help.²* While this may or may not happen with other life forms, it ''can'' happen with viruses. Well, for SARS, at least.²* Invoking this trope via exploration, colonization, and eventual terraforming of other worlds is one of the explicit long-term goals of human space research. If there ''isn't'' already life out there, it'll be up to us to bring it.²[[/folder]]²²----

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