After 57 years of drifting in space, Ellen Ripley is rescued by the Weyland-Yutani corporation. Despite her report, she is not taken seriously by the military regarding the presence of xenomorphs on the planet LV-426 where her crew landed, a planet where several families of colonists have been sent on a terraforming mission. After their disappearance, Ripley decides to accompany a squad of marines on their rescue mission and to confront the Beast again.