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)

William Castle

Director

Directing

Chris Beute

Assistant Director

Directing

William Castle

Writer

Writing

Wilfred H. Petitt

Writer

Writing

Allan Radar

Story

Writing

Rudolph C. Flothow

Producer

Production

Mario Castelnuovo-Tedesco

Original Music Composer

Sound

Jack A. Goodrich

Sound

George Meehan

Director of Photography

Camera

Dwight Caldwell

Editor

Editing