Dr. Savaard is obsessed with bringing the dead back to life. A young medical student offers his services to him, but before he can bring him back to life, Savaard is arrested, convicted, and sentenced to hang. He vows revenge on the judge and the jury before his hanging. His assistant claims his body and revives him by using his technique. The vengeful Savaard goes on a killing spree.

References:
https://en.wikipedia.org/wiki/The_Man_They_Could_Not_Hang