Alien

Sigourney Weaver plays Ripley, the warrant officer who becomes the primary survivor and defender against the alien creature.

Tom Skerritt portrays Dallas, the captain of the Nostromo, who leads the crew on their fateful mission.

Ian Holm takes on the role of Ash, the science officer with a secret agenda regarding the extraterrestrial encounter.

Yaphet Kotto plays Parker, the chief engineer who is concerned about the crew's survival and safety.

John Hurt plays Kane, the executive officer who encounters the alien organism during an exploration on an alien planet.

Veronica Cartwright portrays Lambert, the navigator who experiences intense fear and dread as events unfold.

Harry Dean Stanton plays Brett, the engineering crew member who faces a deadly confrontation with the alien.

Bolaji Badejo is credited as The Alien, the menacing extraterrestrial creature that hunts the crew.

Helen Horton provides the voice of Mother, the ship's computer that oversees the Nostromo's operations.