After the events of the Season 2 finale, Equestria begins to spiral into chaos in the face of a new Changeling threat, a brewing civil conflict, and the second release of Discord.
Nightmare Moon has taken over again, this time succeeding. Will Sunset Shimmer and her new friends find the missing princess, or will Equestria be shrouded in eternal night...forever?
The Seventh Doctor's visit to his former companion, Alicorn Celestia of Equestria, becomes a trek through the mind, dreams, and soul of Princess Luna to try and avert the crisis of Nightmare Moon.
The seeds of darkness have been sown, and soon, everlasting night shall return with its rightful queen. With all of her allies, the dragons, the griffons, and all the monsters of the land fighting by her side, who could possibly hope to stop her?
Twilight fights against sinister manipulations, struggling to overcome a deep-seated darkness within. As she battles to preserve everything she cares about, she will sacrifice anything necessary to succeed. But the price of victory may be herself.
Nightmare Moon won a thousand years ago, plunging Equestria into perpetual night. Now, as Princess Luna's student, Twilight Sparkle must contend with Celestia's unexpected return as a familiar group of ponies are thrown into conflict.