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.

Genres

Cast

Alexander Davion

Dr. Crawford

David Hemmings

Roger Westcott

Charles Tingwell

Captain Jaffe

Tony Wager

Jensen

Keith Buckley

Scotty McIntyre

Hedger Wallace

Commander

Derek Martin

Guard