Before I Hang 1940

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.

Directed by: Nick Grinde
Written by: Robert Hardy Andrews
Runtime: 62 minutes
Tagline: Beware! When Karloff stops the clock, your hour has come!
Cast:
Boris Karloff
Boris Karloff
Dr. John Garth 
Evelyn Keyes
Evelyn Keyes
Martha Garth 
Bruce Bennett
Bruce Bennett
Dr. Paul Ames 
Don Beddoe
Don Beddoe
Capt. McGraw 
Edward Van Sloan
Edward Van Sloan
Dr. Ralph Howard 
Ben Taggart
Ben Taggart
Warden Thompson