Lon Chaney Jr.

as Dan McCormick

Lionel Atwill

as Dr. Paul Rigas

Anne Nagel

as June Lawrence

Frank Albertson

as Mark Adams

Samuel S. Hinds

as Dr. John Lawrence

William B. Davidson

as District Attorney Ralph B. Stanley

Ben Taggart

as Detective Sergeant Regan

Constance Bergen

as Nurse

Ivan Miller

as Doctor

Chester Gan

as Chinese Boy, Wong

George Meader

as Dr. Bruno

Frank O'Connor

as Detective

John Dilson

as Medical Examiner

Byron Foulger

as Alienist #2

Jessie Arnold

as Mrs. Frank Davis (uncredited)

James Blaine

as Charlie, Prison Guard (uncredited)

Gary Breckner

as Radio Announcer (uncredited)

Lowell Drew

as Jury Foreman (uncredited)

John Ellis

as Assistant District Attorney (uncredited)

Douglas Evans

as Police Radio Announcer (uncredited)

Jack Gardner

as Reporter (uncredited)

William Hall

as Mike - Dynamo Operator (uncredited)

Russell Hicks

as Warden Harris (uncredited)

Wright Kramer

as Judge (uncredited)

Tom Quinn

as Detective (uncredited)

Bob Reeves

as Prison Guard (uncredited)

Mel Ruick

as Defense Attorney (uncredited)

Francis Sayles

as Frank Davis (uncredited)

Paul Scott

as Prison Chaplain (uncredited)

David Sharpe

as Hay Wagon Passenger (uncredited)

Victor Zimmerman

as Dynamo Operator #2 (uncredited)

Corky

as Corky the Dog (uncredited)