Lon Chaney Jr.

Character: Dan McCormick

Lionel Atwill

Character: Dr. Paul Rigas

Anne Nagel

Character: June Lawrence

Frank Albertson

Character: Mark Adams

Samuel S. Hinds

Character: Dr. John Lawrence

William B. Davidson

Character: District Attorney Ralph B. Stanley

Ben Taggart

Character: Detective Sergeant Regan

Constance Bergen

Character: Nurse

Ivan Miller

Character: Doctor

Chester Gan

Character: Chinese Boy, Wong

George Meader

Character: Dr. Bruno

Frank O'Connor

Character: Detective

John Dilson

Character: Medical Examiner

Byron Foulger

Character: Alienist #2

Jessie Arnold

Character: Mrs. Frank Davis (uncredited)

James Blaine

Character: Charlie, Prison Guard (uncredited)

Gary Breckner

Character: Radio Announcer (uncredited)

Lowell Drew

Character: Jury Foreman (uncredited)

John Ellis

Character: Assistant District Attorney (uncredited)

Douglas Evans

Character: Police Radio Announcer (uncredited)

Jack Gardner

Character: Reporter (uncredited)

William Hall

Character: Mike - Dynamo Operator (uncredited)

Russell Hicks

Character: Warden Harris (uncredited)

Wright Kramer

Character: Judge (uncredited)

Tom Quinn

Character: Detective (uncredited)

Bob Reeves

Character: Prison Guard (uncredited)

Mel Ruick

Character: Defense Attorney (uncredited)

Francis Sayles

Character: Frank Davis (uncredited)

Paul Scott

Character: Prison Chaplain (uncredited)

David Sharpe

Character: Hay Wagon Passenger (uncredited)

Victor Zimmerman

Character: Dynamo Operator #2 (uncredited)

Corky

Character: Corky the Dog (uncredited)