Godzilla: Tokyo S.O.S.

The story line of Godzilla X Mechagodzilla is continued, this time with Mothra and Kamoebas thrown into the mix along with two brand new larvae.

In the film, Mothra's twin fairies warn the Japanese government that using the first Godzilla's bones as the basis for Mechagodzilla is wrong and that the taking of the original Godzilla's bones is what brought him back - if they don't return them to the sea, then Mothra would declare war on humanity. They say that if Kiryu's bones are returned, however, Mothra will protect Japan from Godzilla. Soon enough, Godzilla comes back. Godzilla and Mothra fight, but Mothra proves to be no match for Godzilla. Kiryu is deployed to help and manages to even the odds. However, Godzilla manages to knock out both Mechagodzilla and Mothra. Meanwhile, on Infant Island, a pair of twin Mothra caterpillars hatch from Mothra's egg, and rush to Japan to help their mother. While the main character rushes to repair Mechagodzilla, Mothra's caterpillars try to hold off Godzilla, and in the process Mothra sacrifices herself to protect her children, bursting into a moth shaped fireball.

Just in time, the humans manages to repair Mechagodzilla, and it faces off against its flesh and blood rival once more. They grapple, and Mechagodzilla lands a powerful hit on Godzilla, stabbing him in the chest with a drill mounted on his right arm. Weakened by the attack, Godzilla roars in agony, and Mothra's caterpillars bind him up in webbing. However, instead of killing Godzilla off for good, Mechagodzilla chooses instead to pick up the battle weary, trussed up Godzilla and carry him off to sea. They plunge into the ocean together, and sink beneath the waves.