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.
Dr. Jack Costain
Ann Barlow
Detective Supt. Hartley
Dr. Morley
The Major
Cmdr. Savage
Det. Tom Grant
Medra
Thorburn
The Sergeant
Pvt. Higgins
Madge Lilburn
Reg Lilburn
Col. Davy
Police Commissioner's secretary
December 31, 1965
Dr. Jack Costain
Ann Barlow
Detective Supt. Hartley
Dr. Morley
The Major
Cmdr. Savage
Det. Tom Grant
Medra
Thorburn
The Sergeant
Pvt. Higgins
Madge Lilburn
Reg Lilburn
Col. Davy
Police Commissioner's secretary
