Season 9 is over, but shortly after its end, Twilight and her friends are faced with an even bigger threat, one spanning across the multiverse. This is the story of Equestria's darkest hours, in the midst of the Cartoon Apocalypse.
After a few months of consideration, Starlight comes to Twilight to request Cozy Glows release. Twilight agrees, although fear of how releasing one of Equestria's worst villainesses in the most turbulent of times causes her to hide the filly.
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While The Two Retired Princesses search for the Lamp with a few of it's old masters Spike find a new master in the escaped Criminal Cozy Glow, who is the first master to ever find the one loop hole that allows her to gain more than three wishes.
The parents of young ponies across Equestria are mysteriously disappearing. A powerful being calling herself the “Sorceress” appears, claiming responsibility and must be stopped with the Elements of Harmony.
Yona's seemingly unrequited crush on the mail-griffon Gabby takes an unexpected turn as Hearth's Warming approaches when Gabby invites her for hot chocolate...
Discord, Celestia, and Luna have lived in peace for years. But when Twilight's student-Luster Dawn -'reforms' Chrysalis, Tirek, and Cozy Glow, the chaos master and pony sisters end up involved just like the old days (as do many others). Chaos, ho!
After Twilight learns about a large debt that Equestria owes to the many different kingdoms. She vows to pay it all back as well as make Celestia pay for using her.
These are the ordinary days in the extraordinary lives of Cozy Glow, Rumble, Flurry Heart and their friends as they learn, play and grow under Twilight's tutelage.
It's time for Cozy Glow to get back out in the real world and figure out where she fits into Equestria. She's tried superheroics, supervillainy, and accidentally destroyed the world; now she has to try being normal. Yeah, probably not.
Flurry Heart is introduced to Applejack’s twins, Apple Chip and Annie Smith, but they are having a hard time coping with the loss of their late great-grandmother, Granny Smith.
Instead of defeating the villain trio by combining the power of friendship yet again, Twilight and the others lose in their desperate attempt of victory to save Equestria.
Silverstream's carefree life towards graduation is thrown upside down by the abrupt appearance of the liberated Queen Chrysalis. What will become of their lives over the course of one day?
Cozy Glow escaped from her stone prison and is gaining power by stealing her foes’ cutie marks. Somehow, the Cutie Mark Crusaders are immune to her, and now it’s up to them to save the day.