Carla Balenda

Janet Keller

Elliott Reid

Matt Corbin

Edgar Barrier

Dr. Edward Keller

Raymond Burr

Steve Loomis

Otto Waldis

Dr. Wilhelm Bucholtz

Michael Steele

Chick

Lurene Tuttle

Molly Loomis

Peter Brocco

Nate Garr

Lewis Martin

Peterson

Frank Darien

Luther Adams

Olive Carey

Mabel Turner

George Barrows

Federal Agent (uncredited)

Stanley Blystone

Guard on Pier (uncredited)

Eddie Borden

Medical Experiment Patient (uncredited)

George Bruggeman

Federal Agent (uncredited)

William Challee

Guard (uncredited)

George Chandler

Jed (uncredited)

G. Pat Collins

Nelson - Gate Guard (uncredited)

Tom Daly

Germ Experiment Victim (uncredited)

Don Dillaway

FBI Agent McIntyre (uncredited)

Art Dupuis

Speedboat Pilot (uncredited)

Douglas Evans

Carstairs (uncredited)

Elizabeth Flournoy

Secretary (uncredited)

Robert Foulk

Guard (uncredited)

Gregory Gaye

Sweitart (uncredited)

Milton Kibbee

Produce Company Proprietor (uncredited)

Mathew McCue

Medical Experiment Patient (uncredited)

Lee Miller

Federal Agent (uncredited)

Billy Nelson

Ed (uncredited)

Jamesson Shade

Sheriff (uncredited)

Brick Sullivan

Federal Agent (uncredited)

Bob Thom

Federal Agent (uncredited)

Frank Wilcox

Bradford (uncredited)

William Yetter Sr.

German Pier Guard (uncredited)

William Cameron Menzies

Director

Frank L. Moss

Guión, Guión Adaptado

George Bricker

Guión, Guión Adaptado

Roy Hamilton

Historia

Nicholas Musuraca

Director de Fotografía

Paul Sawtell

Compositor de la Música Original

Lewis J. Rachmil

Productor

RKO Radio Pictures

Compañía de Produccion

Robert Golden

Editor