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Play Sound Doctor, we've done it. You've done it, it doesn't seem possible. The only change was in the hormone count. That was the change we needed. But what we've made once, we can take apart, analyse and make again. Get me a sterile test tube quickly. Oh doc, lock up time. So soon?
Doctor, we've done it. You've done it, it doesn't seem possible. The only change was in the hormone count. That was the change we needed. But what we've made once, we can take apart, analyse and make again. Get me a sterile test tube quickly. Oh doc, lock up time. So soon?

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Description: A physician on death row for a mercy killing is allowed to experiment on a serum using a criminals' blood, but secretly tests it on himself. He gets a pardon, but finds out he's become a Jekyll-&-Hyde.

Cast:
Dr. John Garth: Boris Karloff
Martha Garth: Evelyn Keyes
Dr. Paul Ames: Bruce Bennett
Dr. Ralph Howard: Edward Van Sloan
Warden Thompson: Ben Taggart
Victor Sondini: Pedro de Cordoba
George Wharton: Wright Kramer
Stephen Barclay: Bertram Marburgh
Police Capt. McGraw: Don Beddoe
District Attorney: Robert Fiske
Anson, Prison Guard: Kenneth MacDonald
Otto Kron: Frank Richards
Sam - Hospital Prison Orderly: Ernie Adams
Prison Gate Guard: Stanley Brown
Governor Prentiss: Frederick Burton
Patrolman Olson: Jack Cheatham
Dr. Nichols: Edward Earle
Mandish: Richard Fiske
Courtroom Spectator: Edmund Mortimer
Guard: Eddie Laughton
Butler: James T. Mack
Reardon: George McKay
Counsel at Defense Table: Bert Moorhouse
Judge Braden: Charles Trowbridge
Sanders: John Tyrrell
Police Dispatcher: Gohr Van Vleck

Written by: Robert Hardy Andrews, Karl Brown

Director: Nick Grinde

Production: Columbia Pictures

Release date: 17 Sep 1940