Commander Dwayne Hicks and Lieutenant Ellen Ripley lead a battalion of Colonial Marines to investigate a suspicious Xenomorph population on a certain planet. Meanwhile, two Weyland Yutani Commandos pursue the Marines with the intention of stopping the marines from killing off the Xenomorphs, so that the corrupt Weyland Yutani Corporation can retrieve the Xenomorphs from the planet and make them into an army of supersoldiers.