Following the battle with
Mecha-King Ghidorah in mid-1992, a
meteoroid crashes in the
Izu–Ogasawara Trench and awakens
Godzilla from hibernation. Six months later, ex-archaeologist Takuya Fujito is detained after stealing an ancient artifact in
Thailand. Later, Ryuzo Dobashi, a representative of the
Japanese prime minister, offers to drop Takuya's charges in exchange for exploring Infant Island in
Indonesia with his ex-wife, Masako Tezuka and Kenji Ando, the secretary of the rapacious Marutomo Company. After arriving on Infant Island, the trio find a cave containing a depiction of two giant moths in battle. Further exploration leads them to a giant egg and a pair of diminutive humanoids called the
Cosmos, who identify the egg as belonging to
Mothra. The Cosmos tell of an ancient civilization that tried to control the Earth's climate 12,000 years ago, thus provoking the Earth into creating Battra, a male divine moth with a ferocious appearance that vaguely resembles Mothra. Battra destroyed the civilization and their weather-controlling device but then became uncontrollable, and started to harm the very planet that created him. Mothra was then sent by the Earth to fight Battra, who eventually sealed in the
Arctic Ocean by the former. The Cosmos explain how the meteoroid uncovered Mothra's egg, and may have awoken Battra, who is still embittered over humanity's interference in the Earth's natural orders. The Marutomo Company sends a freighter to Infant Island to pick up the egg, ostensibly to protect it. As they are sailing, Godzilla surfaces and heads toward the newly hatched Mothra larva. Battra soon appears in his larval form and joins the battle, allowing Mothra to retreat. The battle between Godzilla and Battra is eventually taken underwater, where the force of the battle causes a giant crack on the
Philippine Sea Plate that swallows the two. In
Manila, Masako and Takuya later discover Ando's true intentions when he takes the Cosmos to Marutomo headquarters, where its president Takeshi Tomokane intends to use them for publicity purposes. Mothra enters
Tokyo in an attempt to rescue the Cosmos, but the
Japan Self-Defense Forces attack her. The wounded Mothra heads for the
National Diet Building and starts constructing a cocoon around herself. Meanwhile, Godzilla surfaces from
Mount Fuji, while Battra frees himself from the Earth's crust and continues towards Japan. Both Mothra and Battra metamorphose into their imago forms and converge at
Yokohama Cosmo World where they begin to fight once more. Godzilla interrupts the battle and initially attacks Battra. Mothra then briefly incapacitates Godzilla and comes to Battra's aid before returning to battle with Godzilla. Battra then returns the favor coming to Mothra's defense. Regrouping, Mothra and Battra decide to join forces against Godzilla, determining Godzilla to be the greater threat to the planet. Eventually, the two moths overwhelm and carry Godzilla over the ocean. Godzilla kills Battra by biting his throat and blasting his wound with atomic breath. An exhausted Mothra drops Godzilla and the lifeless Battra into the ocean and seals Battra's resting place below the surface by creating a mystical glyph with scales from her wings. The next morning, the Cosmos explain that Battra had been waiting many years to destroy an even larger meteoroid that would threaten the Earth in 1999. Mothra had promised she would stop the future collision if Battra were to die, and she and the Cosmos leave Earth as the humans bid farewell. ==Cast==