Thanks to the love bomb at the Royal Wedding, Princess Celestia is revealed to be a Changeling Queen. How will Equestria, deal with this? And why is Celestia a Changeling Queen in the first place?
Twilight Sparkle, Celestia and Luna are transported into a strange alternate Equestria, the Land of Always Summer, where the day lasts forever and a terrible queen rules with an iron hoof.
Twenty years into the future, the Elements of Harmony have grown apart in their bid to attain their dreams. But when Princess Celestia has one more task for them, the Mane Six band together for one last adventure.