The Abominable Dr. Phibes (1971)

After his wife died on the operating table, a disfigured and vengeful doctor, Dr. Phibes, seeks revenge on the medical team. He uses the ten biblical plagues to carry out his gruesome killings, leaving Scotland Yard puzzled. As the body count rises, an inspector and a young doctor race against time to stop Dr. Phibes before he completes his deadly vendetta.