With Earth virtually destroyed, Bran Marshall flees to the Rhea, a planet hostile to Earthlings. Escaping onto a Rhean supply ship, he finds the crew slaughtered, with the only survivor a female warrior named Ohsha. As the two try to kill one another, the ship is damaged by meteorites. Bran and Ohsha must join forces to salvage the craft before it impacts on the planet below, and the humans that live there.