Mysterious Intruder

Richard Dix

Don Gale

Barton MacLane

Detective Taggart

Nina Vale

Joan Hill, Gale's Secretary

Regis Toomey

James Summers

Helen Mowery

Freda Hanson

Mike Mazurki

Harry Pontos

Pamela Blake

Elora Lund

Charles Lane

Detective Burns

Paul E. Burns

Edward Stillwell

Kathleen Howard

Rose Denning

Harlan Briggs

Mr. Brown

Jessie Arnold

Woman in Window (Uncredited)

Stanley Blystone

Henry (Uncredited)

Jack Carrington

Bartender (Uncredited)

Eddy Chandler

Cop in Squad Car (Uncredited)

Kernan Cripps

Kelly (Uncredited)

Edith Evanson

Mrs. Ward (Uncredited)

Otto Forrest

The Whistler (Voice) (Uncredited)

Eric Taylor

Screenplay, Story

Philip Tannura

Director of Photography

William Castle

Director

Rudolph C. Flothow

Producer

Dwight Caldwell

Editor

George Duning

Original Music Composer

Wilbur Hatch

Original Music Composer