Boris Karloff

Dr. John Garth

Evelyn Keyes

Martha Garth

Bruce Bennett

Dr. Paul Ames

Don Beddoe

Capt. McGraw

Edward Van Sloan

Dr. Ralph Howard

Ben Taggart

Warden Thompson

Pedro de Cordoba

Victor Sondini

Wright Kramer

George Wharton

Bertram Marburgh

Stephen Barclay

Robert Fiske

District Attorney

Frank Richards

Otto Kron - Convict

Kenneth MacDonald

Anson, Prison Guard

Ernie Adams

Sam - Hospital Prison Orderly

Frederick Burton

Governor Prentiss

Edward Earle

Dr. Nichols

Nick Grindé