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.
Cast:
Alexander Davion, David Hemmings, Charles Tingwell, Peter Fraser, Tony Wager
Production:
BBC TV
Dr. Crawford
Roger Westcott
Captain Jaffe
Donnie Chaffer
Jensen
Scotty McIntyre
Gerry
Dave
Frank
Ken
Commander
Officer
Guard
