In this sci-fi thriller based on a Philip K. Dick story, a team of rescuers from Earth responds to an SOS from an abandoned planet only to find a motley crew of human survivors eking out an existence there. But are these humans really human, or have the Screamers -- the robotic killers that destroyed the other human inhabitants -- simply morphed into human form to carry out an even more sinister mission? Lance Henriksen and Gina Holden co-star.