 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.