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.—Jeremy Lunt
Magazine reporters Hiroyuki Kurosaki and his colleagues brought back to Japan a monster child who had just hatched from an egg issued on the isolated island of Obelisk in the South Sea.