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Humanity Came from Space

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"Life here began out there."
Commander Adama, Battlestar Galactica (1978)

Despite the considerable evidence that Homo sapiens evolved here on Earth, it is tempting to hypothesize that our ancestors could have come from somewhere else. Not only were ancient humans incredibly advanced, they also had a star-spanning empire. And Earth is a Lost Colony of that empire, if not the last remnant of it.

Contrast Transplanted Humans (humanity did originate from Earth, but some ancient humans were taken away by aliens to settle another planet) and Ultraterrestrials (supposedly "extraterrestrial" nonhumans are actually natives to Earth). Subtrope of Alien Animals. When humans inhabit a planet other than Earth and have forgotten they came from a different planet it's a Lost Colony. Not to be confused with Human Aliens. Usually involves Advanced Ancient Humans, which is any case where the supposed Precursors were indeed human, regardless of their spatial origin. Compare Panspermia, where all life on Earth originated from space (and thus may or may not overlap with this trope) as well as Original Man, where the older form of humanity is noticeably distinct from the newer.


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    Anime and Manga 
  • Earth is a colony of the Jurai Empire in Tenchi Muyo!. They enforce an Alien Non-Interference Clause and have some contact with the Japanese government. Though most of the population isn't even aware of this.
  • Macross plays with this; it's revealed in the first series that humanity was created by a Precursor race known as the Protoculture, who inserted their own genetic material into Earth's native wildlife to create a new species that would evolve to be similar to their creators. The Protoculture actually did this with a number of planets across the Milky Way, but their ultimate plans are still largely shrouded in mystery, as they seem to have gone completely extinct around 10,000 years before the start of the series.

  • Jupiter Ascending: We really came from a planet named Ourus originally, and were then "seeded" on Earth 100,000 years ago. Also, it's one of the few examples where humanity's ancient galaxy-spanning empire still exists, and is hostile, with space humans planning to "harvest" those on Earth to make a youth serum without any ethical qualms, seeing us as essentially livestock. They also killed the (sapient) dinosaurs.
  • Outlander mentions that Earth is an "abandoned seed colony" of Kainan's species.
  • In the made-for-TV movie Roswell: The Aliens Attack, John reveals to Katie that Earth was settled by the crash-landed survivors of an interstellar prison transport. It escaped notice for a long time, being just another Lost Colony, until some interstellar rich guy bought rights to the planet and hired John and Eve to "exterminate the vermin" crawling all over it. It's heavily implied that this is what they do for a living. John infiltrates the Walker Air Force Base as a nuclear physicist from the Pentagon and uses his advanced tech to supercharge the atom bomb stored on the base to irradiate the entire surface of the planet. Then he falls for Katie and changes his mind. Side note: John and Eve are Human Aliens; The Greys found at the crash site were their genetically-engineered pilots.

  • Empire from the Ashes: Earth was colonized 50,000 years ago by the mutinous crew of the Fourth Imperium warship Dahak, which has been acting as the Moon ever since.
    • It's also believed Earth was seeded by an the Third Imperium, after the 5th planet was destroyed in an attack against the Second Imperium, causing the Asteroid that killed the Dinosaurs.
  • In Ursula K. Le Guin's Hainish cycle, Earth is just one of many long-lost colonies established by the Hainish people, hundreds of thousands of years ago, possibly as a long-term sociological experiment that they lost track of (as several of the other colonies apparently are) when their ancient empire collapsed.
  • The plot of Edmond Hamilton's The Haunted Stars revolves around the discovery that humanity is descended from the vast interstellar empire. A true homeworld of humanity was Ryn, the third planet of Altair. That empire was destroyed by unknown powerful alien enemies.
  • In The Hitchhiker's Guide to the Galaxy, it is revealed that humans are descended from the most useless third of the Golgafrinchan population, who were kicked out for having silly jobs like disinfecting pay phones. The remaining two-thirds of the Golgafrinchans were later wiped out by a plague contracted from a pay phone. Despite being nearly completely hopeless at survival (they're more preoccupied with sorting out things like currency than food and shelter), the Golgafrinchans managed to out-compete and replace Earth's native hominids and survived long enough to start some form of civilization.
  • In Larry Niven's Known Space universe, Homo habilis were actually Pak breeders, from a planet closer to the galactic core. In the "breeder" phase of their life they are about as smart as chimps (who also evolved from Paks, apparently) but in middle age they become able to eat a root called "The Tree of Life" that contains a virus which transforms them into superintelligent armored Protectors single-mindedly obsessed with preserving their genes. When they colonized Earth it turned out that the soil couldn't support the Tree of Life and the Protectors died off, without them and their instinctive culling of mutants the Pak colony evolved into Earth's great apes.
    • The Ringworld was also built by Pak Protectors, whose descendants evolved into hundreds, if not thousands of different humanoid species.
  • The punchline of Frank Herbert's short story Occupation Force is that the aliens who just landed in Washington DC are just checking up on a colony they founded... roughly seven thousand years ago.
  • In H. Beam Piper's Paratime multiverse, timelines are assigned to "levels" in part based on whether the inhabitants remember humanity originally came from Mars. Earth was originally settled by Martians; in most timelines, the colony regressed to primitivism, with the survivors losing all knowledge of their history and gradually developing a new civilization which believes itself to be native to Earth.
  • In The Stars Are Cold Toys, it's eventually revealed that both Earth and the Geometers' homeworld are Lost Colonies of the original humans from the galactic core. It's heavily implied that most life started in the Core and spread out, which includes the majority of the Conclave races. Partly subverted is that there's no great ancient empire at the Core. Just a whole bunch of worlds connected by a unique Portal Network that sends people to a place matching their innermost desires.
  • Downplayed in The Giants Series, and the arguments about whether this is possible make up much of the plot of the first book, Inherit The Stars. Humans from Earth were taken to Minerva millions of years ago, and returned 50,000 years ago when Minerva was destroyed.
  • Area 51: It's revealed that humanity isn't native to Earth. They were created elsewhere by the Airlia, an alien species, to be their soldiers.
  • The novels about Northwest Smith repeatedly inform us that Man has conquered space before, you may be sure of that.
  • Survey Team by Philip K. Dick has an expedition sent to Mars during a nuclear war to see if the survivors can settle there. They find the entire planet has been mined or harvested of anything useful, so even the soil is no longer any good. They find records indicating that the Martians evacuated their population to a pristine world, but their society descended into barbarism. Facing extinction, the desperate humans decide to find this planet and seize it from the Martians, until they discover it's actually Earth.
  • The short-short story "Reunion" by Arthur C. Clarke consists of a message from interstellar visitors explaining that Earth is one of their lost colonies, which collapsed in mass panic when much of the population developed a disfiguring (though not debilitating) genetic condition. The message ends in the Wham Line "If any of you are still white, we can cure you."

    Live-Action TV 
  • In Babylon 5, the Centauri tried to pull a fast one by claiming that Earth is their Lost Colony. It didn't take long for human scientists to get a sample of Centauri DNA and expose the hoax-at which point the Centauri explained it away by stating that, given the nature of hyperspace travel and that they used to rule the space around Earth, they mistook Earth for a lost colony that was in the area.
  • The premise of both versions of Battlestar Galactica is that humanity evolved on Kobol and Earth is one of thirteen colonies, the other twelve of which have maintained contact. Though in Battlestar Galactica (2003) it eventually turns out that the audience lives on the second planet to be called Earth, the first one suffered the same fate as the other twelve colonies. "We" are apparently descended from a mix of refugees from all thirteen colonies and Earth II's native hominids.
  • In the first-season finale of Space: 1999 the Alphans come across a planet called Arkadia that hosts the ruins of a 25,000-year old human civilization, and they gradually figure out that it was humanity's original homeworld.
  • In season 9 of Stargate SG-1 it turns out that the Ancients weren't originally from Earth but came from a different galaxy altogether, and that they were fleeing a war with religious fanatics who have since then Ascended to a Higher Plane of Existence like them, who unlike the Ancients, want to be worshiped.
  • The Twilight Zone (1959): In the episode "Probe 7, Over and Out", an astronaut crash-lands on an uninhabited planet after his homeworld has a nuclear war, and shortly after meets a woman whose homeworld was destroyed. Their names turn out to be Adam and Eve.
  • The Twilight Zone (1985): In the episode "A Small Talent for War", it's revealed that humanity was seeded on Earth by aliens, and that they are very disappointed with our progress in becoming warriors.
  • Ultraseven: The Nonmalts in Episode 42 "Ambassador of the Nonmalt" claim that humanity are aliens from outer space that colonized and destroyed their homes then forced them to live underground and allegedly try to take back what's rightfully theirs. The series itself never confirms if this is true but Heisei Ultraseven runs with the interpretation that it's indeed the truth and in fact, the world's powers and the Ultra Guard's high commands have been trying to hide this fact from the public in special files, it's only revealed thanks to Ultraseven personally making sure they are released.

  • The Unarians believe that Chinese people came from Mars.

    Video Games 
  • The later Halo games revealed that humanity once had a large space empire thousands of years ago but were beaten back to the caveman level and forcibly resettled on Earth after a war with the Forerunners. However, it's also suggested that humanity really did come from Earth and simply lost all record of it after going into space; not even one of ancient humanity's most prominent scientists could tell for sure.
  • Doom:
    • Doom³ implies that we're the last survivors of a Martian civilization that came to Earth to escape the demons that were wiping them out.
    • In Doom Eternal, the Codex entry for Cultist Base implies that Earth itself is actually a long-lost colony of the Argenta, who are native to the distant world of Argent D'Nur.
  • In EVE Online, Earth is merely a legend, such is the amount of time (more than fifteen thousand years) it's been since the Eve Gate closed and cut the colonies of New Eden off from the Milky Way galaxy from which they were colonized. All that the humans of New Eden know about where they came from is that they did not evolve in this galaxy, and that their origin has something to do with the Eve Gate.

  • In Afrikaans webcomic Verlore Geleentheid humans, or "Om-Ankh", invaded Earth and drove off the original inhabitants, a canine species called "Khanites", ten thousand years ago. Until it turned out the Om-Ankh were created by a Khanite cult that believed the world government's peace was making their society stagnant.

    Western Animation 
  • The South Park episode "Cancelled", all life on Earth is one big intergalactic Reality Show, in which different species from other planets had been brought together for the amusement of the viewing public. Notably, each human ethnicity (for instance Jews, Asians and Hispanics) is said to be from a different planet.