Voice of the Whistler

Richard Dix

John Sinclair / John Carter

Lynn Merrick

Joan Martin Sinclair

Rhys Williams

Ernie Sparrow

James Cardwell

Fred (Doc) Graham

Egon Brecher

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

Charles Coleman

Sinclair's Butler (uncredited)

Otto Forrest

The Whistler (uncredited)

Byron Foulger

Georgie (uncredited)

John Hamilton

Doctor (uncredited)

Charles Marsh

Sinclair Executive (uncredited)

Gigi Perreau

Bobbie (uncredited)

Frank Reicher

Dr. Rose (uncredited)

William Castle

Director

George Meehan

Director of Photography

Mario Castelnuovo-Tedesco

Original Music Composer

Dwight Caldwell

Editor

Rudolph C. Flothow

Producer

William Castle

Writer

Wilfred H. Petitt

Writer

Allan Radar

Story

Jack A. Goodrich

Sound

Chris Beute

Assistant Director