The JSDF deploys a flying combat vehicle outfitted with anti-nuclear cold weapons, the Super X III, in an effort to reverse Godzilla's self-destruction; while Godzilla's meltdown is not stopped, it is halted long enough to temporarily render him unconscious. Meanwhile, scientists discover that Dr. Serizawa's Oxygen Destroyer, which was used against the original Godzilla in 1954, has awoken and mutated a colony of Precambrian organisms lying dormant in Tokyo Bay, which were then freed from the surrounding rock during the construction of the Tokyo Bay Aqua Line. The creatures combine into several man-sized crab-like creatures and begin wreaking havoc after killing all the fish in an aquarium. After several deadly skirmishes with the JSDF, the creatures, dubbed "Destoroyah", merge into a single Aggregate form, which then transforms again into its Flying form and leaves the scene.