A university professor rediscovers an ancient Mayan formula that turns men into obedient, zombie-like creatures. He uses a medical student as a test subject and becomes obsessed with the student's fiancée, a concert singer, who is secretly in love with her accompanist. The professor's obsession leads to a series of murders, and a reporter must uncover the truth behind the crimes.
The Mad Ghoul
A rogue experiment unleashes a deadly transformation, turning a medical student into a ruthless killer.
