das Alien
alien
A living being that comes from another planet; an extraterrestrial.
Der Science-Fiction-Film handelt von einer Invasion durch feindselige Aliens.
The science fiction film is about an invasion by hostile aliens.

alien
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alien
A living being that comes from another planet; an extraterrestrial.
Der Science-Fiction-Film handelt von einer Invasion durch feindselige Aliens.
The science fiction film is about an invasion by hostile aliens.

In German, 'das Alien' (alien) exclusively means a being from another planet. In English, 'alien' can also refer to a foreigner or stranger, but the German word does not have this meaning.
In vielen Filmen werden Aliens als grüne Männchen dargestellt.
In many films, aliens are portrayed as little green men.
'Alien' is a modern loanword from English. This also explains why the plural is formed as in English with an '-s': 'die Aliens' (the aliens).
Glaubst du, dass es im Universum noch andere Aliens gibt?
Do you believe there are other aliens in the universe?
The word is used almost exclusively in the context of science fiction. People talk about aliens in films, books, and theories about extraterrestrial life.
Mein Lieblingsbuch handelt vom ersten Kontakt der Menschheit mit Aliens.
My favorite book is about humanity's first contact with aliens.