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| Bela Lugosi | Dr. James Brewster | |
| Louise Currie | Billie Mason | |
| Wallace Ford | Jeff Carter | |
| Henry Hall | Dr. George Randall | |
| Minerva Urecal | Agatha Brewster | |
| Emil Van Horn | The Ape | |
| J. Farrell MacDonald | Police Capt. O'Brien | |
| Wheeler Oakman | Det. Brady | |
| Ralph Littlefield | Zippo | |
| Jack Mulhall | Reporter | |
| Charles Jordan | Det. O'Toole | |
| Charlie Hall | Barney | |
| Ray Miller | Reporter | |
| Ernest Morrison | Copyboy | |
| William Ruhl | Martin |
| Director |
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| Producer | Sam Katzman
Jack Dietz |
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| Writer | Karl Brown
Barney A. Sarecky |
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| Cinematography | Mack Stengler
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Scientist turned into an ape man |
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