Twilight goes to an interdimensional party hosted by Pinkie and is immediately out of her depth; hilarity ensues as she interacts with the occupants of many different universes. Meanwhile the party rages all around her as Pinkie visits all of her dimension hopping friends.

Fluttershy has always had trouble finding her voice, confident only when surrounded by her animal friends. So of course she's eager to take in a small blue creature she thinks needs her help. But when her newest guest begins destroying everything, Fluttershy may have to find her a voice a little sooner than she expected.

Shining Armor and Cadence's spell reveals something completely unexpected as it expels Chrysalis and her changelings out of Canterlot: A secret kept from everypony for several years...

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King Sombra’s dark influence was obliterated by the Crystal Heart, and the villain is well and truly dead. But when he attempts to steal the afterlife of an innocent victim, a human spirit is left hurtling towards Equestria, where this unfortunate soul is revived into the only vessel available: the reconstituted body of King Sombra himself.

Thus, a cheerfully oblivious alien is crammed into the form of the most evil and malicious being Equestria has ever known. Not that Shining Armor and Cadence know this, of course. As far as they are concerned, the King is back and he’s lost his fricking mind.

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Okay, I don't know if anyone can hear this, or read this, or whatever, but I'm trying my best to use Pinkie Pie's legendary fourth-wall-breaking powers to try and get a message out.

If you can hear this, I need help. I'm in Equestria, and man, this is strange. But I'm also stuck in Pinkie Pie's body, for some reason.

Yes, it's just as weird as it sounds. And now, I need your help... because all the ponies in this town think I'm crazy!

Twilight and the other Elements of Harmony have saved the land of Equestria from Nightmare Moon, Discord, and the Changeling army, but now they face perhaps their biggest challenge yet. A challenge that lurks behind smiling faces and friendly eyes. A challenge that threatens to overtake the entirety of Equestria and enslave its inhabitants. But the ponies won’t face this threat alone. Help comes in the form of the most unlikely of companions: four teenagers, a hawk, and a blue centaur.