On Jupiter's moon Ganymede, an alien life-form has taken over the body of a human astronaut, creating an almost perfect copy. It then begins the long return journey to Earth.
as Dr. Crawford
as Roger Westcott
as Captain Jaffe
as Donnie Chaffer
as Jensen
as Scotty McIntyre
as Gerry
as Dave
as Frank
as Ken
as Commander
as Officer
as Guard
