Voice of the Whistler

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) Rudolph C. Flothow Producer Wilfred H. Petitt Writer William Castle Writer Dwight Caldwell Editor William Castle Director Allan Radar Story Mario Castelnuovo-Tedesco Original Music Composer George Meehan Director of Photography Jack A. Goodrich Sound Chris Beute Assistant Director