Godzilla - colossal apex predator hailing from a time in Earth's past where surface radiation levels were considerably higher, Godzilla retreated deep underwater to feed on the planet's natural geothermal radiation when the surface radiation levels decreased. He occasionally surfaced throughout history, inspiring some of humanity's mythology.
Kong is the last surviving member of a species of huge apes known as kongs that once were numerous on Skull Island. While he was still an adolescent, Kong and his parents were attacked by a pack of dinosaurs called Deathrunners and their huge matriarch, Gaw. Kong's mother and father were both brutally killed in the attack, but Kong survived and grew up with an intense hatred for Gaw and all the meat-eating dinosaurs on the island. Eventually, Kong took his revenge by killing Gaw, establishing himself as the undisputed king of Skull Island and the god worshiped by the natives.