Indestructible Man.

Charles "Butcher" Benton (Chaney) is a double-crossed convicted robber and murderer who was executed in the gas chamber. His body is unlawfully sold to a scientist who plans to move his experiments into the cause and cure of cancer to human subjects. Benton's corpse is subjected to chemical injection and massive jolts of high-voltage electricity in order to study the effect on human tissues. But his heart is restimulated and he completely revives.