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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Cast
- Boris KarloffDr. John Garth
- Evelyn KeyesMartha Garth
- Bruce BennettDr. Paul Ames
- Don BeddoeCapt. McGraw
- Edward Van SloanDr. Ralph Howard
- Ben TaggartWarden Thompson
- Pedro de CordobaVictor Sondini
- Wright KramerGeorge Wharton
- Bertram MarburghStephen Barclay
- Robert FiskeDistrict Attorney
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