Alien: While investigating a transmission from a desolate planet, the crew of the spaceship Nostromo discovers a derelict spaceship and a life form perfectly evolved to annihilate them all. Ripley, the only survivor from the first encounter with the alien, returns to Earth, where her account meets with skepticism. However, the disappearance of colonists on a distant planet compels her to join a team of marines on their mission to eradicate the alien...