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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Boris Karloff
Dr. John Garth
Evelyn Keyes
Martha Garth
Bruce Bennett
Dr. Paul Ames
Don Beddoe
Capt. McGraw
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