Boris Karloff as John Ellman

Ricardo Cortez as Nolan

Edmund Gwenn as Dr. Evan Beaumont

Marguerite Churchill as Nancy

Warren Hull as Jimmy

Barton MacLane as Loder

Henry O'Neill as District Attorney Werner

Joe King as Judge Roger Shaw

Addison Richards as Prison Warden

Paul Harvey as Blackstone

Robert Strange as Merritt

Joe Sawyer as 'Trigger' Smith

Eddie Acuff as 'Betcha'

Kenneth Harlan as Stephen Martin

Miki Morita as Loder's Butler Sako

Ruth Robinson as Mrs. Shaw

George Beranger as Nolan's Butler (uncredited)

Wade Boteler as Cellist's Guard (uncredited)

Frank Darien as Cemetery Caretaker (uncredited)

Edward Gargan as Guard Sitting Outside Warden's Office (uncredited)

Crauford Kent as British Radio Announcer (uncredited)

Milton Kibbee as Reporter (uncredited)

William H. O'Brien as Juror (uncredited)

Paul Panzer as Man in Courtroom (uncredited)

Leo White as Man in Courtroom (uncredited)