Time travelers from the 22nd century come back to present-day Japan to warn the world that Godzilla is about to return, and his rampage will be so devastating that the country will never recover. With the assistance of a non-fiction writer who has correctly deduced Godzilla's true origin, the people from the future propose going back in time to prevent Godzilla's birth. However, when they return to the present, they discover that Godzilla has been replaced by an even greater threat: the three-headed demon King Ghidorah! How can the world survive without the King of the Monsters to confront this new terror?