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Boris Karloff as Prof. Nathaniel Billings |
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Peter Lorre as Dr. Arthur Lorentz |
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Maxie Rosenbloom as Maxie |
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Jeff Donnell as Winnie Slade |
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Larry Parks as Bill Layden |
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Maude Eburne as Amelia Jones |
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Don Beddoe as J. Gilbert Brampton |
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George McKay as Ebenezer |
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Eddie Laughton as Mr. Johnson |
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Frank Puglia as Silvio Baciagalupi |
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Frank Mitchell as Officer Fred |
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James C. Morton as Trooper Quincy |
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Frank Sully as Officer Joe Starrett |
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Patrick McVey as Munitions Plant Road Guard |
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Robert Emmett Keane as Alarm Clock Salesman |
| Directing | Lew Landers | Director |
| Writing | Hal Fimberg | Story |
| Writing | Paul Gangelin | Adaptation |
| Writing | Edwin Blum | Screenplay |
| Writing | Robert B. Hunt | Story |
| Sound | Morris Stoloff | Music Director |
| Camera | Henry Freulich | Director of Photography |
| Editing | Richard Fantl | Editor |
| Production | Colbert Clark | Producer |
