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.
Night Caller from Outer Space is a British 1965 science fiction film directed by John Gilling and starring John Saxon, Maurice Denham and Patricia Haines. It was written by Jim O'Connolly based on Frank Crisp's 1961 novel The Night Callers. A colourised version of the film was released in 2011.