A year and a half has passed since Twilight Sparkle departed from the human world. Sunset Shimmer has adapted to life with her new friends, eagerly counting down the days until thirty moons pass, and the portal to her world reopens. But on the eve of the seventeenth moon, her idyllic life is shattered when magic suddenly manifests in the human world, and a familiar face makes an unexpected reappearance. With only thirteen moons remaining until the portal reopens, Sunset Shimmer and the gang must embark on a journey across the globe, battling fierce monsters and meeting new allies, to save their world from the newly unleashed magical energies.

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