
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.
Cast

John Saxon
Dr. Jack Costain

Patricia Haines
Ann Barlow

Alfred Burke
Detective Supt. Hartley

Maurice Denham
Dr. Morley

John Carson
The Major

Ballard Berkeley
Cmdr. Savage

Stanley Meadows
Det. Tom Grant
Barbara French
Joyce Malone

Robert Crewdson
Medra

Aubrey Morris
Thorburn

Jack Watson
The Sergeant

Tony Wager
Pvt. Higgins
David Gregory
Pvt. Jones

Marianne Stone
Madge Lilburn

Warren Mitchell
Reg Lilburn

Geoffrey Lumsden
Col. Davy
Douglas Livingstone
2nd R / T soldier

Tom Gill
Police Commissioner's secretary
Vincent Harding
First R/T Soldier
Romo Garrara
Lieutenant
John Sherlock
TV Newscaster
Crew

John Gilling
Director

Jim O'Connolly
Screenplay
Frank Crisp
Novel
Philip Barnikel
Editor
Stephen Dade
Director of Photography
John I. Phillips
Executive Producer
Ronald Liles
Producer
Joyce James
Hairstylist
Bunty Phillips
Makeup Artist
Barbara Hopkins
Sound
Johnny Gregory
Original Music Composer
Harry White
Art Direction
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