Applebloom's life couldn't be better. The Cutie Mark Crusaders all have their Cutie Marks, Diamond Tiara and Silver Spoon have stopped being bullies, the Apple siblings know the truth about their parents, Grand Pear and Granny Smith have finally let go of their mutual hatred and put the Apple-Pear feud in the past, the Crusaders are allowed to be tutors in the School of Friendship, Cozy Glow is in Tartarus, Scootaloo is no longer in danger of being forced to move away, and all the worries that had been giving Applebloom nightmares have ceased to exist.

Unfortunately, there's something who doesn't appreciate Applebloom's newfound contentment. Something that has long since been overlooked by Princess Luna of all ponies. Even worse, it plans to find a sense of contentment of its own; and with a little help from Spoiled Rich, it just might succeed in doing so, with catastrophic consequences for everycreature in Ponyville.