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comparative more extraterrestrial, superlative most extraterrestrial
Originating from outside of the Earth's atmosphere, from space, or from another planet; alien to Earth or its environment. quotations examples
Residents of the city of Voronezh insisted today that lanky, three-eyed extraterrestrial creatures had indeed landed in a local park and gone for a stroll and that a seemingly fantastic report about the event carried Monday by the official press agency Tass was absolutely true.
1989 October 11, Esther B. Fein, “U.F.O. Landing Is Fact, Not Fantasy, the Russians Insist”, in The New York Times, archived from the original on 12 October 2012, Section A, page 6
plural extraterrestrials
A being originating from outside of the Earth's atmosphere, from space, or from another planet; an alien quotations examples
Smith returns in Men In Black 3 as a veteran agent of a secret organization dedicated to policing the earth’s many extraterrestrials.
2012 May 24, Nathan Rabin, “Film: Reviews: Men In Black 3”, in The Onion AV Club