Richard Dix

John Sinclair / John Carter

Lynn Merrick

Joan Martin Sinclair

Rhys Williams

Ernie Sparrow

James Cardwell

Fred (Doc) Graham

Tom Kennedy

Ferdinand / Hammerlock

Sam Ash

Gibson Motor Car Co. Executive (uncredited)

Egon Brecher

Dr. Rose (replaced by Frank Reicher) (uncredited)

Otto Forrest

The Whistler (uncredited)

Byron Foulger

Georgie (uncredited)

Martín Garralaga

Tony, Fruit Peddler (uncredited)

John Hamilton

Doctor (uncredited)

Stuart Holmes

Sinclair Executive (uncredited)

Wilbur Mack

Sinclair Executive (uncredited)

Charles Marsh

Sinclair Executive (uncredited)

Harold Miller

Sinclair Executive (uncredited)

Forbes Murray

Sinclair Executive (uncredited)

Gigi Perreau

Bobbie (uncredited)

Frank Reicher

Dr. Rose (uncredited)

Frank J. Scannell

Druggist (uncredited)

Minerva Urecal

Georgie's Wife (uncredited)

Robert B. Williams

Pharmacist (uncredited)

Douglas Wood

Paul Kitridge - Attorney (uncredited)