 | Richard Dix als John Sinclair / John Carter |
 | Lynn Merrick als Joan Martin Sinclair |
 | Rhys Williams als Ernie Sparrow |
 | James Cardwell als Fred (Doc) Graham |
 | Tom Kennedy als Ferdinand / Hammerlock |
 | Sam Ash als Gibson Motor Car Co. Executive (uncredited) |
 | Egon Brecher als Dr. Rose (replaced by Frank Reicher) (uncredited) |
 | Charles Coleman als Sinclair's Butler (uncredited) |
 | Otto Forrest als The Whistler (uncredited) |
 | Byron Foulger als Georgie (uncredited) |
 | Martín Garralaga als Tony, Fruit Peddler (uncredited) |
 | John Hamilton als Doctor (uncredited) |
 | Stuart Holmes als Sinclair Executive (uncredited) |
 | Wilbur Mack als Sinclair Executive (uncredited) |
| Charles Marsh als Sinclair Executive (uncredited) |
 | Harold Miller als Sinclair Executive (uncredited) |
 | Forbes Murray als Sinclair Executive (uncredited) |
 | Gigi Perreau als Bobbie (uncredited) |
 | Frank Reicher als Dr. Rose (uncredited) |
 | Clinton Rosemond als Train Porter (uncredited) |
 | Frank J. Scannell als Druggist (uncredited) |
 | Minerva Urecal als Georgie's Wife (uncredited) |
 | Robert B. Williams als Pharmacist (uncredited) |
 | Douglas Wood als Paul Kitridge - Attorney (uncredited) |
| William Castle | Director |
| William Castle | Writer |
| Wilfred H. Petitt | Writer |
| Allan Radar | Story |
| Rudolph C. Flothow | Producer |
| Mario Castelnuovo-Tedesco | Original Music Composer |
| George Meehan | Director of Photography |
| Dwight Caldwell | Editor |
| Chris Beute | Assistant Director |
| Jack A. Goodrich | Sound |
