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.
George Spenton-FosterDirector
Alan NourseStory
Philip BroadleyAdaptation
Alexander DavionDr. Crawford
David HemmingsRoger Westcott
Charles TingwellCaptain Jaffe
Peter FraserDonnie Chaffer
Tony WagerJensen
Keith BuckleyScotty McIntyre
David SavileGerry
Geoffrey KenionDave
Barry AshtonFrank
David MunroKen
Hedger WallaceCommander
Lew LutonOfficer
Derek MartinGuard
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