Queen Chrysalis, seeking vengeance on Twilight, Cadance, and Celestia, uses a spell that transports her to the Land of Ooo and the Candy Kingdom. Princess Bubblegum seeks help from Celestia and Luna. Twilight and Cadance are sent to Ooo to make sure Chrysalis's plan doesn't succeed. Because once Chrysalis takes over the Candy Kingdom, Equestria will be next!
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This is a crossover with Adventure Time and My Little Pony; Friendship is magic