Directed by Ridley Scott, Alien (1979) stars Sigourney Weaver in her breakthrough role as Ellen Ripley. The film follows the crew of a commercial spaceship who encounter a deadly extraterrestrial organism after responding to a distress signal. Combining science fiction and horror elements, the film became a defining entry in late 20th-century genre cinema and launched a long-running franchise.

Från IMDB:
After investigating a mysterious transmission of unknown origin, the crew of a commercial spacecraft encounters a deadly lifeform.