Ro-Man, an alien robot who greatly resembles a gorilla in a diving helmet, is sent to earth to destroy all human life. Ro-Man falls in love with one of the last six remaining humans, and struggles to understand how his programming can instruct him to kill her while his heart demands that he can't.
George Nader
Roy
Claudia Barrett
Alice
Gregory Moffett
Johnny
John Mylong
The Professor
Selena Royle
Mother
Pamela Paulson
Carla
George Barrows
Ro-Man the Monster / Great Guidance
John Brown
Ro-Man / Great Guidance (voice)
