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John Baragrey as Dr. Henry Spensser |
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Mala Powers as Anne Spensser |
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Otto Kruger as Dr. William Spensser |
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Robert Hutton as Dr. John Robert Carrington |
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Ross Martin as Dr. Jeremy 'Jerry' Spensser |
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Ed Wolff as The Colossus |
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Charles Herbert as Billy Spensser |
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Dick Nelson as Charles - Chauffeur-Butler |
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Roy Engel as Police Inspector |
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Charles Sherlock as Airline Pilot |
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George Douglas as |
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Sam Harris as |
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Larry Kerr as |
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Harold Miller as |
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Foster H. Phinney as |
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Max Power as |
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Jack Richardson as |
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Court Shepard as |
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Bert Stevens as |
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Ed Wolff as |
| Directing | Eugène Lourié | Director |
| Writing | Thelma Schnee | Screenplay |
| Production | William Alland | Producer |
| Sound | Van Cleave | Original Music Composer |
| Camera | John F. Warren | Director of Photography |
| Editing | Floyd Knudtson | Editor |
| Art | John B. Goodman | Art Direction |
| Art | Hal Pereira | Art Direction |
| Visual Effects | John P. Fulton | Visual Effects |
| Directing | Ralph Axness | Assistant Director |
| Writing | Willis Goldbeck | Writer |
