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.
Tambelon Ancient Dark City Grogar's Stronghold formerly the Capital of Equestria Now Locked in the Dark Dimension but its inhabitants are waiting for the day when they can return to 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?
In the distant future, where Twilight rules Equestria, Chrysalis still remains in her stone prison. Tiger Tornado, a student at the School of Friendship, brings her poems to Canterlot, returning to the dream girl she's never met.
Twilight Sparkle is about to be crowned ruler of Equestria, but on this day of all days, the peace is disturbed by the ultimate threat: Emperor Grogar and the Horses of the Apocalypse.
Chrysalis and Tirek are soon to be sentence to death for the murder of Spike The Dragon. Raven Inkwell steps in to defend them and prove their innocence and expose the truth.