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- Walter Pidgeon as Dr. Edward Morbius
- Anne Francis as Altaira "Alta" Morbius
- Leslie Nielsen as Commander John J. Adams
- Robby the Robot as Himself
- Warren Stevens as Lt. "Doc" Ostrow
- Jack Kelly as Lt. Jerry Farman
- Richard Anderson as Chief Quinn
- Earl Holliman as Cook
- George Wallace as Steve
- Bob Dix as Grey
- James Drury as Strong
- Harry Harvey, Jr. as Randall
- Roger McGee as Lindstrom
- Frankie Darro as Robby the Robot
- Marvin Miller as Robby the Robot (voice)