Cast:
Boris Karloff, Evelyn Keyes, Bruce Bennett, Don Beddoe, Edward Van Sloan, Ben Taggart, Pedro de Cordoba, Wright Kramer, Bertram Marburgh, Robert Fiske, Frank Richards, Kenneth MacDonald, Ernie Adams, Frederick Burton, Edward Earle, Richard Fiske, George McKay, John Tyrrell, Jack Cheatham, Charles Trowbridge, Bert Moorhouse, Sam Harris, Edmund Mortimer, Stanley Brown, Eddie Laughton, James T. Mack, Gohr Van Vleck
Tags:
experiment, mad scientist, murder, doctor, pianist, pardon, split personality, anti-aging, mercy killing, convicted murderer, youth serum