The Mad Ghoul (1943)- George Zucco,Evelyn Ankers

Dr.  Alfred Morris lectures to his chemistry students that the ancient Mayans may have discovered a poisonous gas that caused a state of "death in life". His prize pupil Ted Allison is fascinated by the possibility of such a gas. Dr. Morris soon takes advantage of his pupils zeal and exposes him to the ancient gas, turning him into an obedient zombie. A series of grave robberies and mutilations soon follows drawing the attention of the local police. Things are complicated by the lovely singer Isabel  Lewis,Ted's fiancee whom the professor also desires. While not in his zombie state Ted asks Isabel to marry him and she refuses. The professor and his prize pupil soon learn that she has fallen for her concert pianist. The professor and his mindless victim continue to perform horrific acts. Who will stop the Mad Ghoul?