The inhabitants of Ganymede need to find mates from another world or they will become extinct. They soon discover a suitable breeding stock amongst the females of planet Earth.
John Saxon
Patricia Haines
Alfred Burke
Maurice Denham
John Carson
Ballard Berkeley
Stanley Meadows
Barbara French
Robert Crewdson
Aubrey Morris
Jack Watson
Tony Wager
David Gregory
Marianne Stone
Warren Mitchell
Geoffrey Lumsden
Douglas Livingstone
Tom Gill
Vincent Harding
Romo Garrara
John Sherlock