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)

Harold Miller

Sinclair Executive (uncredited)

Forbes Murray

Sinclair Executive (uncredited)

Gigi Perreau

Bobbie (uncredited)

Frank Reicher

Dr. Rose (uncredited)

Clinton Rosemond

Train Porter (uncredited)

William Castle

Director, Writer

Mario Castelnuovo-Tedesco

Original Music Composer

Dwight Caldwell

Editor

Rudolph C. Flothow

Producer

George Meehan

Director of Photography

Wilfred H. Petitt

Writer

Allan Radar

Story

Jack A. Goodrich

Sound

Chris Beute

Assistant Director