alien; extraterrestrial
Common loanword for an extraterrestrial being, often in science fiction contexts.
その映画には怖いエイリアンが出てくる。
A scary alien appears in that movie.
Stories about aliens invading Earth are common.
He claims to have been abducted by aliens.
The protagonist encounters an alien in the forest.
In the movie, a huge number of aliens invade Earth.