Any sort of conflation between aliens and The Fair Folk. There are two variants of this trope. The first one is the so-called paleocontact theory which implies that various legendary creatures (gods, demons, angels, fairies, gnomes, etc.) are actually extraterrestrials who visited Earth many centuries ago. The other variant is the so-called "interdimensional hypothersis" proposed by ufologist John Keel and astrophysicist Jacques Vallee; according to it, the fairytale creatures (who are actually Ultraterrestrials possibly of electromagnetic origin) are nowadays posing as aliens in order to trick humans. Compare Space Elves.
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- In Clifford Simak's The Goblin Reservation, various legendary creatures (goblins, trolls, banshees) turn out to have come to Earth from another planet thousands of years ago.
- In works by H.P. Lovecraft, the Great Old Ones are supernatural creatures akin to pagan gods (for instance, Shub-Niggurath aka the Black Goat of the Woods with a Thousand Young is obviously related to God Pan) who are actually of extraterrestrial origin.
- Kim Newman's Diogenes Club story "Angel Down, Sussex", deals with an extra-dimensional incursion in rural Britain in the 1920s, at precisely the point at which human perception of such entities is beginning to shift from traditional occult/faerie mythology to twentieth-century UFO mythology.
- In the Artemis Fowl series, demons are decended from micro-organisms that once lived on the moon, and arrived on earth during the Triassic period. As a result of the moon being hit by a meteor, a chunk of the moon broke off and plummeted to earth, bringing the organisms that would eventually evolve into demons to earth, and creating the island of Hybras where they have lived ever since.
- Subverted in Martians Go Home by Fredric Brown. The protagonist tells a Martian his kind must account for all the superstitions about elves as such, only for the Martian to say human stupidity is what accounts for it.
- In Isaac Asimov's short story "Kid Stuff", all the myths about elves and such turn out to come from ancient races of insect descended Ultraterrestrials.
- In another story by Asimov, "Everest", rumors about yeti on the titular mountain turn out to be due to a Martian outpost established in the place where the aliens feel most comfortable.
- One of Hunt Emerson's "Phenomenomix" comic strips in Fortean Times dealt with a bunch of fairies leaving their mound to terrorise a lone traveller. A young rebellious fairy spent the strip moaning about how dull and routine the procedure had become, before in the final panel sneaking off to a secluded dungeon to work on his "fairy chariot"... a stereotypical Flying Saucer.
- Some versions of Mister Mxyzptlk from DC Comics have him and his kind as inspiration for fairies and elves.
Live Action TV
- Twin Peaks is seemingly inspired by works of Keel and Vallee: the Black Lodge inhabitants have electromagnetic properties, and they were researched by the Project Blue Book; besides, in an abandoned version of Season 3 script, BOB and MIKE were intended to be aliens who came from a planet made of creamed corn.
- In Goblin Slayer, it's revealed that The Goblins actually come from the Moon.
- Changeling: The Lost makes a point of mentioning this trope, with The Greys listed as one of the many forms The Fair Folk can take. That said, the game also mentions that honest-to-goodness extraterrestrial Greys may also exist. (And, if you use the rest of the New World of Darkness in your Changeling game, they officially do.)
- In Nelson Tethers: Puzzle Agent, the mysterious gnome-like creatures known as the Hidden People turn out to be some lunar spirits.
- In Tony Tough And The Night Of Roasted Moths, a pumpkin-headed villain known as Jack O'Lantern steals candy from children every Halloween; the protagonist believes him to be an alien who plans to conquer the Earth. Ultimately subverted; he's neither a supernatural creature nor an alien, but the protagonist's bully neighbor who got a pumpkin stuck on his head.
- In Homestuck, alien species are Theme Named after legendary creatures: trolls, cherubim and leprechauns have all made appearances. They are generally odd mixtures of their namesakes and various alien traits. The trolls are a hermaphroditic species evolved from insects who live in a Hive Caste System, but they are violent Horned Humanoids with often superhuman strength. Cherubim are skull-faced reptilians whose life cycle involves a Split-Personality Takeover and a fight to the death next to a black hole, but they do look angelic and maintain a Balance Between Good and Evil in the universe. Leprechauns are an all-male species of Little Green Men who engage in Homosexual Reproduction and come in batches of fifteen, but they mate by doing jiggy little dances, their emotional states are represented by Lucky Charms Symbols, and they are made of felt.
- Roswell Conspiracies: Aliens, Myths and Legends: Turns out that vampires, werewolves, Banshees and Yeti are all aliens that have arrived to Earth many years ago and have moulded legends.
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