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 |
| Camera | Elwood Bredell | Director of Photography |
| Writing | Eric Taylor | Screenplay |
| Writing | Curt Siodmak | Screenplay |
| Editing | Philip Cahn | Editor |
| 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 |
| Sound | Frank Skinner | Original Music Composer |
