A U.S. military specialist ("Lost's" Terry O'Quinn) is called up from retirement to investigate after soldiers outside Baghdad discover a mysterious casualty- one they can't even identify as human. As he and his team try to identify the "corpse," others begin to appear, making him wonder whether the fallen creatures are emissaries from another world.

The mutant victims of a terrible plague that almost wiped out Earth's population are exiled to outer space aboard a ramshackle ship. They have no hope of returning home, until an ambassador from Earth ("Desperate Housewives'" James Denton) arrives and offers them a desperate pact.