Aliens & Ghosts
Alien primarily refers to:
Alien (law), a person in a country who is not a national of that country
Enemy alien, the above in times of war
Extraterrestrial life, life which does not originate from Earth
Specifically, a lifeform with extraterrestrial intelligence
For fictional extraterrestrial life, see Extraterrestrials in fiction
Introduced species, a species not native to its environment
Alien(s), or The Alien(s) may also refer to:
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