Beware! When Karloff stops the clock, your hour has come!
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.
Crew
Directed by: Nick Grindé, Benjamin H. Kline, Morris Stoloff
Produced by: Wallace MacDonald
Cast
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