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.
Director: George Spenton-Foster
Story: Alan Nourse
Producer: Irene Shubik
Dr. Crawford
Roger Westcott
Captain Jaffe
Donnie Chaffer
Jensen
Scotty McIntyre
Gerry
Dave
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