Mogu begins his assault upon Manehatten as Twilight and her friends lead Godzilla to meet him in battle. With the fate of Equestria at stake in the battle, it will take both the magic of friendship and the power of the King of the Monsters to end Ghidorah's threat for good.

To combat the looming threat of Mogu, Princess Twilight Sparkle and her friends attempt to summon aid from the other world, only to find they have called forth an even more dangerous foe; Godzilla. Now, before they can save Equestria from Mogu, Twilight and her friends must first stop Godzilla from destroying it. But what can seven little ponies do against the King of the Monsters?

Princess Twilight awakens one night to a warning from two tiny fairies: the King of Terror has come to Equestria. Soon after, she learns that dark forces have transformed Garble the dragon into the unstoppable Mogu. Now it's up to Twilight and her friends to find a way to stop this kaiju-sized threat. But to defeat a monster, they'll need a bigger and more powerful monster...