Godzilla Sets the Earth Ablaze

In this hypothetical simulation for what could happen if Godzilla's meltdown reaches its logical conclusion, Godzilla's heart goes critical, creating a gigantic explosion that vaporises the Wako Main Building, Tokyo Tower and the Diet Building, then levels Tokyo with a nuclear explosion with a power unlike anything ever seen before, and finally sets the very atmosphere itself on fire, bringing about a global cataclysm that could end life on Earth.

Example of:
World-Wrecking Wave