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