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Chester Morris as Dr. Carlo Lombardi |
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Marla English as Andrea Talbott / Elizabeth Wetherby |
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Tom Conway as Timothy Chappel |
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Cathy Downs as Dorothy Chappel |
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Lance Fuller as Dr. Ted Erickson |
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Ron Randell as Police Lt. Ed James |
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Frieda Inescort as Mrs. Chappel |
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Frank Jenks as Plainclothes Sgt. with Lt James |
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El Brendel as Olaf, the butler |
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Paul Dubov as Johnny, the barker |
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William Hudson as Bob, the ex-fiancé |
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Flo Bert as Marta, the Maid |
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Jeanne Evans as Mrs. Brown |
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Kenneth MacDonald as Police Doctor with Prof. Anderson |
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Jack Mulhall as Lombardi's Lawyer |
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Edward Earle as Professor Anderson |
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Bess Flowers as Party Guest |
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Paul Blaisdell as The She-Creature |
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Spike as King the Dog |
| Directing | Edward L. Cahn | Director |
| Writing | Lou Rusoff | Story |
| Writing | Lou Rusoff | Screenplay |
| Production | Alex Gordon | Producer |
| Sound | Ronald Stein | Original Music Composer |
| Camera | Frederick E. West | Director of Photography |
| Editing | Ronald Sinclair | Editor |
| Writing | Jerry Zigmond | Idea |
| Production | Samuel Z. Arkoff | Executive Producer |
| Production | Israel M. Berman | Associate Producer |
| Art | Don Ament | Art Direction |
| Art | Harry Reif | Set Decoration |
| Costume & Make-Up | Jack Dusick | Makeup Artist |
| Production | Bartlett A. Carré | Production Supervisor |
| Directing | Bartlett A. Carré | Assistant Director |
| Visual Effects | Paul Blaisdell | Creature Design |