Frankenstein Must Be Destroyed (1970)

Blackmailing a young couple to assist with his horrific experiments the Baron desperate for vital medical data abducts a man from an insane asylum On route the abductee dies and the Baron and his assistant transplant his brain into a corpse The creature is tormented by a trapped soul in an alien shell and after a visit to his wife who violently rejects his monstrous form the creature wreaks his revenge on the perpetrator of his misery Baron Frankenstein