Cast of Alien

Sigourney Weaver portrays Ripley, the resourceful warrant officer and the film's main protagonist.

Tom Skerritt plays Dallas, the captain of the commercial spacecraft Nostromo.

Ian Holm brings Ash to life, the science officer aboard the Nostromo with a chilling secret.

Yaphet Kotto is Parker, the chief engineer of the Nostromo who faces the alien threat head-on.

John Hurt portrays Kane, the executive officer who falls victim to the alien's brutal reproductive cycle.

Veronica Cartwright plays Lambert, the Nostromo's navigator caught in a terrifying fight for survival.

Harry Dean Stanton is Brett, the ship's engineering technician who faces a gruesome demise at the hands of the alien.

Bolaji Badejo embodies the menacing Alien, a relentless and deadly extraterrestrial creature stalking the crew of the Nostromo.

Helen Horton provides the haunting voice of Mother, the computer system onboard the Nostromo.

Roy Scammell has an uncredited role as the Alien, contributing to the creature's physical performance.

Eddie Powell is also uncredited for portraying the Alien, adding to the terrifying presence of the creature on screen.