A tragic accident occurs when a bus hits a high power line. The incident has claimed the lives of all on board, except for one Dan McCormick (Lon Chaney, Jr.), who survives because he is, surprisingly, immune to the deadly electricity. McCormick does a sideshow exhibit as ''Dynamo Dan, the Electric Man'' and is taken in by Dr. John Lawrence (Samuel S. Hinds), who wants to study him. However, Dr. Lawrence's colleague, mad scientist Dr. Paul Rigas (Lionel Atwill) desires to create an army of electrophysiology-driven zombies. He gives McCormick progressively higher doses of electricity until his mind is ruined and left dependent on the addicting electrical charges. This temporarily gives McCormick the touch of death, making him capable of killing anyone he touches by electric shock. After accidentally killing Lawrence, Rigas ensures McCormick's conviction to see what will happen if he is sent to the electric chair. McCormick survives, and with a super charge in his glowing body he kills several people, including Rigas, before running out of electricity and dying.