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.

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Main Cast: Alexander Davion, David Hemmings, Charles Tingwell, Peter Fraser, Tony Wager, Keith Buckley, David Savile, Geoffrey Kenion, Barry Ashton, David Munro

Director: George Spenton-Foster

Writer: Alan Nourse

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Cinematographer:

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