Mechagodzilla II

Mechagodzilla Mk II: The United Nation's ultimate Anti-Godzilla Weapon

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Brief History
When Godzilla attacked the city of Kyoto, Mechagodzilla was deployed against him. The mechanical kaiju acquitted itself well, but was eventually defeated due to a voltage back-surge during their electrocution of Godzilla. One of Mechagodzilla's back-up pilots, Kazuma Aoki, suggested merging Mechagodzilla with a previous anti-Godzilla weapon. Namely, the airship Garuda, originally deemed a design failure and shelved in preference to Mechagodzilla.

Kazuma, in fact the chief designer and main pilot of Garuda to start with, found some personal redemption as his idea is approved. The combined form of the two mechs, dubbed Super Mechagodzilla, is unleashed against the King of the Monsters and Fire Rodan. In the heat of battle, Kazuma personally detaches Garuda and flies against Fire Rodan while the other Mechagodzilla crew continue against Godzilla. Kazuma is defeated, but manages to reattach the Garuda to Mechagodzilla to form Super Mechagodzilla. Super Mechagodzilla proceeds to destroy Godzilla's own reptilian secondary brain and moves in for the kill. Fire Rodan reappears, but is killed by a blast from Super Mechagodzilla. Upon dying, Fire Rodan's body dissolves, releasing the radioactive energy within its body and healing Godzilla's injuries. When Godzilla rises, its level of radioactivity is so high that Super Mechagodzilla's artificial diamond coating, which allowed it to deflect Godzilla's atomic breath, begins to melt. As a result, Super Mechagodzilla is rendered defenseless against the revived monster. Godzilla, temporarily supercharged with radiation, destroys the mech with a blood-red version of his atomic beam. However, despite the defeat, Super Mechagodzilla's crew were able to escape uninjured.(from Wikizilla)