Ripley (Sigourney Weaver), the sole survivor from the original 'Alien', is awakened after 57 years of drifting through space, her stories disbelieved by Company executives who tell her that the alien's planet is now inhabited and colonized. When contact is suddenly lost with the colonists, Ripley returns to the planet with a squad of marines, an android (Lance Henriksen), and a Company executive (Paul Reiser) with a mission of his own. Once on the planet, no survivors can be found except for Newt, a little girl who awakens motherly instincts in Ripley just in time for the acid-blooded aliens to attack in what quickly becomes a one-sided battle for sheer survival.