Cast
- Richard Dix as John Sinclair
- Richard Dix as John Carter
- Lynn Merrick as Joan Martin Sinclair
- Rhys Williams as Ernie Sparrow
- James Cardwell as Fred Graham
- Tom Kennedy as Hammerlock Ferdinand
- Sam Ash as Gibson Motor Car Co. Executive
- Charles Coleman as Sinclair's Butler
- Max Davidson as Man in Clinic Waiting Room
- Otto Forrest as The Whistler
- Byron Foulger as Georgie
Crew
- William Castle · Director
- Wilfrid H. Pettitt · Writer
- William Castle · Writer
- Allan Radar · Writer
- Rudolph C. Flothow · Producer
- George Meehan · Cinematographer
- Dwight Caldwell · Editor