Plot: Forty-two years after her first visit in Tokyo, Mothra returns to warn mankind that they must return Mechagodzilla, along with Godzilla's bones, to the sea, for the dead must not be disturbed. If not, dire consequences will follow. However, Godzilla is once again on the rampage, and Mechagodzilla is Japan's only defense.
Alternative Plot: Mothra's twin fairies appear with a warning to Japan... Kiryu (aka Mechagodzilla) must be put to rest at the bottom of the ocean or face the wrath of Mothra. When Godzilla returns once again, will humanity heed the warning or will Kiryu be forced to fight against two monsters?
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