After his battle against Cthulhu, Godzilla escaped from the civilization and moved to a new place to destroy everything and he find this island, however Smaug was also searching a place to destroy everything and he arrived in this place, starting a fight between both monsters. After fighting for years for the island, godzilla and smaug did an agreement to stop the fight, half of the island would be for dinosaurs and the other half for the dragons.