In 1945, America dropped the Atomic Bomb on Hiroshima and Nagasaki.
In 1954, Godzilla first appeared, rampaging through Tokyo before being destroyed.
In 1985, Godzilla reappeared. Over the next few years, other monsters arose, and clashed between themselves as well as with the human race. This age of beasts lasted for 10 years, when the monsters mysteriously disappeared.
In 2000, Godzilla appeared a third time. He rampaged through Tokyo again, but soon retreated to the depths of the ocean. It was not long after that the Earth was suddenly attacked by another planet, dubbed Planet X, whose ruling race, the Xiliens, used the beasts that had ravaged the planet years earlier, having them strike at once.
Earth's nations realized that there only chance of survival was to band together, and with their unified power were able to repel some of the monsters attacks. However, others proved to be too powerful, and it was not till Godzilla reappeared.
Godzilla battled each beast and struck them down, one after the other. Till finally came the day when he faced King Ghidorah, the Emporer Godbeast of the Xiliens. Their battlefield lay upon the icy tundra of Antarctica. Upon these barrens lands, they battled for nearly a day. The Earth stood still as two true Dragons decided its fate. The end of the mythic battle came in the form of a monstrous blast of light, from which neither figure emerged.
Humanity moved on unsure of how to feel. Godzilla gave his life to protect them as creatures of Mother Earth. However, when mankind turned off their lights and slipped under their sheets, there was always a careful ear listening for the roar of the King of the Monsters, marking his return to reap vengeance upon mankind for their sins.