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Walter Pidgeon as Dr. Edward Morbius |
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Anne Francis as Altaira Morbius |
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Leslie Nielsen as Commander John J. Adams |
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Warren Stevens as Lt. 'Doc' Ostrow |
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Jack Kelly as Lt. Jerry Farman |
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Earl Holliman as Cookie |
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Richard Anderson as Chief Engineer Quinn |
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George D. Wallace as Bosun |
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Robert Dix as Crewman Grey |
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Jimmy Thompson as Crewman Youngerford |
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James Drury as Crewman Strong |
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Harry Harvey Jr. as Crewman Randall |
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Roger McGee as Crewman Lindstrom |
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Peter Miller as Crewman Moran |
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Morgan Jones as Crewman Nichols |
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Richard Grant as Crewman Silvers |
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James Best as Crewman (uncredited) |
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William Boyett as Crewman (uncredited) |
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Les Tremayne as Narrator (voice) (uncredited) |
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Frankie Darro as Robby the Robot (interior) (uncredited) |
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Marvin Miller as Robby the Robot (voice) (uncredited) |
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Robby the Robot as Robby the Robot |
| Directing | Fred M. Wilcox | Director |
| Writing | Cyril Hume | Screenplay |
| Production | Nicholas Nayfack | Producer |
| Sound | Bebe Barron | Original Music Composer |
| Sound | Louis Barron | Original Music Composer |
| Camera | George J. Folsey | Director of Photography |
| Editing | Ferris Webster | Editor |
| Art | Cedric Gibbons | Art Direction |
| Art | Arthur Lonergan | Art Direction |
| Art | Hugh Hunt | Set Decoration |
| Art | Edwin B. Willis | Set Decoration |
| Costume & Make-Up | Walter Plunkett | Costume Design |
| Costume & Make-Up | Helen Rose | Costume Design |
| Writing | Irving Block | Story |
| Writing | Allen Adler | Story |
| Art | Irving Block | Production Design |
| Art | Mentor Huebner | Production Design |
| Directing | George Rhein | Assistant Director |
| Directing | John Greenwald | Assistant Director |
| Art | A.D. Flowers | Set Dresser |
| Sound | Wesley C. Miller | Sound Recordist |
| Sound | James Brock | Sound |
| Sound | Kurt Hernfeld | Sound Editor |
| Crew | A. Arnold Gillespie | Special Effects |
| Crew | Joshua Meador | Special Effects |
| Crew | Warren Newcombe | Special Effects |
| Crew | Irving G. Ries | Special Effects |
| Crew | Logan Frazee | Special Effects |
| Crew | Doug Hubbard | Special Effects |
| Crew | Robert Kinoshita | Special Effects |
| Crew | Glen Robinson | Special Effects Technician |
| Crew | Franklyn Soldo | Special Effects Technician |
| Visual Effects | Bob Abrams | Visual Effects |
| Visual Effects | Joshua Meador | Visual Effects |
| Costume & Make-Up | Sydney Guilaroff | Hairstylist |
| Costume & Make-Up | William Tuttle | Makeup Artist |
| Sound | John Lipow | Sound Editor |
| Sound | Kendrick Kinney | Sound Editor |
