Fifty-seven years after her ordeal with an extraterrestrial creature, Ellen Ripley is rescued by a deep salvage team during her hypersleep. When she discovers that transmissions from a colony that has since settled on the alien planet suddenly stop, Ripley is offered a chance to team up with a group of marines to descend on the planet and investigate the alien presence. Determined to end the memories of the alien creature, Ripley agrees and is once again thrown back into her living nightmare.