Two hundred years after the events of "Alien 3," several clones of Ripley, including the alien queen she was carrying, are grown by the military aboard the USM "Auriga". The military intends to exploit the aliens, and uses humans kidnapped and delivered to them by a group of mercenaries as hosts for the queen's eggs. The Aliens escape, and Ripley 8 (a clone mixed with Alien DNA) and the mercenaries attempt to escape and destroy the "Auriga" before it reaches Earth.