A violent criminal called The Butcher is brought back to life by a scientist using electricity. The Butcher becomes an invulnerable mute, and seeks vengeance upon those who caused his execution.
An expedition in the South Pacific lands on a tropical island where the natives worship the mysterious deity Gappa. An earthquake opens up an underground cavern and a baby reptile is discovered inside. The natives warn the foreigners to leave the hatching alone, but they don't listen and take it back to a zoo in Japan. Soon after, moma and papa Gappa start smashing Tokyo looking for their kidnapped child.