Forget everything you think you know about Atlantis. The ancient civilization was once an idyllic island in the middle of the ocean, subject not just to the regular caprice of Mother Nature, but also under the threat-and protection-of kaiju! Mechagodzilla provides them with their one true protection against these monstrous forces, but is it enough when ambitious and evil members of the cultural elite try to summon a three-headed beast to take control? All bets are off when King Ghidorah swoops down from the skies. But its presence not only terrifies the island citizenry, it also awakens the King of the Monsters to emerge from its home deep below the waves. Can Godzilla prevent the legendary civilization from a watery grave?