Lt. Ripley (Sigourney Weaver) is the lone survivor when her crippled spaceship crash lands on Fiorina 161, a bleak wasteland inhabited by former inmates of the planet's maximum security prison. Ripley's fears that an Alien was aboard her craft are confirmed when the mutilated bodies of ex-cons begin to mount. Without weapons or modern technology of any kind, Ripley must lead the men into battle against the terrifying creature. And soon she discovers a horrifying fact about her link with the Alien, a realisation that may compel Ripley to try destroying not only the horrific creature, but herself as well.