A meteorite collides into the Earth, setting off a chain reaction. This results in strong currents that unearth Mothra's egg on Infant Island. Due to the damage to the area, an expedition is sent to assess the island. While there, they find both Mothra's egg and two small Cosmos, members of a age old civilization that once lived on Earth. Unfortunately, the Cosmos had constructed a weather device, controlling the climate. This led to the birth of the Black Mothra: Battra. Mothra defended the Cosmos from Battra, but only a few Cosmos survived the conflict. Unfortunately the meteorite has woken Battra in present time as well. The creature arrives in Japan, causing massive damage before it vanishes. Meanwhile on Infant Island, Mothra's egg is being taken back to Japan. The trip is sidetracked as Godzilla arrives. Sensing the danger, the Mothra larva hatches from the egg and the two kaiju begin to fight. The pair are interrupted by Battra, though, who proves to be a formidable match for Godzilla...
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