Pinkie makes ponies happy. That's no secret. After all, that's what her Cutie Mark means, she was destined to do so. But Rainbow Dash has a question: how does she do it so easily?
Given the successful befriending of Discord, Princess Celestia deems that no longer will villains be defeated but instead reformed. Brought back from the dead and stripped of his powers, Sombra only wishes he could have stayed dead all along.
Starlight Glimmer is about to get her revenge on Twilight and her friends, she just has to stop that cyan pegasus from doing her rainbow trick. But before doing so, she receives a visit from a Doctor.
Trapped in a magical storybook with King Sombra, Twilight must escape by finishing a collection of fairy tales. All they have to do is reach the ending. But not all heroes get a happily ever after...