On a direct collision course with Earth, a large moon rapidly approaches from the outer regions of the solar system and Dr. Dana Shaw is sent along with a specialized mining crew to try to alter its course. Once upon the moon Shaw is faced not only with a brutal time schedule and a greedy, opportunistic crew captain, but with the release of a seemingly indestructible carnivorus alien, imprisoned within the moon eons ago by a race it had been slowly decimating. 十多年前。 脱轨卫星即将撞击地球，为一探究竟，丹娜萧博士带领一群矿工，负起探勘的责任。这群矿工的领袖是雷恩，成员有寇弟、班顿、小陆及阿奇。他们不相信这个危机的真实性，对于萧博士强迫他们“自愿”加入一事，皆心怀怨恨。在探勘的过程中，探险队发现了白金秘室，室内除满布难解的外星文字，还有一堆外星人的化石遗骸。雷恩与机工波特为一已自私，意欲把秘室白金带走，与一心完成任务，以保地球安全的萧博士起了争执。就在此时，外太空的化石与大气接触后，逐渐开始“起死回生”。经破解室中的象形文字，他们终于了解，他们所解放的是最最恐怖、有不死之身的杀人机器。
