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.
Boris Karloff | Dr. John Garth | |
Evelyn Keyes | Martha Garth | |
Bruce Bennett | Dr. Paul Ames | |
Edward Van Sloan | Dr. Ralph Howard | |
Pedro de Cordoba | Victor Sondini | |
Ben Taggart | Warden Thompson |
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