Prehistoric and Intergalactic megamonsters beware! Japan's jet-propelled, flying giant turtle returns, after a 14-year absence in this deliberately retro Japanese sci-fi fantasy, to defeat his giant nemesis Gyaos and to keep the world safe for children everywhere. The trouble begins when a plutonium transport is botched; somehow this disturbs an atoll, causes the disappearance of a professor and an entire village, and reawakens three Gyaos, gigantic flying lizard things with enormous wing-spans who fly about Japan making a lot of noise and causing infinite destruction. The clever scientists observing the birds decide that there is only one structure in Japan big enough to cage the pesky supercreatures: the Fukuoka Dome baseball stadium which has a roof that can open and close. All of the ensuing hullabaloo manages to awaken Gamera, the monster turtle, from his long slumber. He promptly destroys the stadium and releases two of the Gyaos. Disaster ensues as he and the scientists endeavor to stop the avian invaders from destroying the entire world. The film's exciting, climactic battle between Gamera and Gyaos takes place in the smoldering ruins of Tokyo.