Ripley crash-lands on the prison planet Fiorina 161, only to discover the facility overrun by a deadly Xenomorph infestation. Armed with standard Colonial Marine weaponry, she must navigate the hostile environment while locating and extracting imprisoned inmates who have fallen victim to the alien threat. Her survival and theirs depend on her ability to combat the creatures stalking the corridors while piecing together how the nightmare unfolded on this forsaken world.