Before I Hang (1940)🔹

Before I Hang is a 1940 US crime horror science fiction film. It features Boris Karloff, Evelyn Keyes, Bruce Bennett, and Edward Van Sloan. 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.