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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)

Charles Coleman Sinclair's Butler (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)