Synopsis
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.
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Evelyn Keyes
Martha Garth
Edward Earle
Dr. Nichols
Boris Karloff
Dr. John Garth
Bruce Bennett
Dr. Paul Ames
Edward Van Sloan
Dr. Ralph Howard
Don Beddoe
Capt. McGraw
Frederick Burton
Governor Prentiss
Robert Fiske
District Attorney
Frank Richards
Otto Kron - Convict
Pedro de Cordoba
Victor Sondini
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