University professor George Kingsley is struck by gangsters while crossing the street, leaving him with brain damage and one of the gangsters, Cannon, paralyzed. Kingsley's friend Dr. Sovac attends to both men, and when Cannon offers him a reward for aiding his recovery, Kovac transplants part of Cannon's brain into the dying Kingsley's skull, creating a dual personality.
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| Directing | Arthur Lubin | Director |
| Writing | Curt Siodmak | Screenplay |
| Writing | Eric Taylor | Screenplay |
| Camera | Elwood Bredell | Director of Photography |
| Editing | Philip Cahn | Editor |
| Sound | Frank Skinner | Original Music Composer |
| Production | Burt Kelly | Associate Producer |
| Art | Jack Otterson | Art Direction |
| Costume & Make-Up | Vera West | Costume Design |
| Sound | Charles Carroll | Sound |
| Costume & Make-Up | Jack Pierce | Makeup Artist |
| Sound | Hans J. Salter | Music Director |
