In an alternate timeline, somepony else got to the Mirror Portal before Sunset and stole both it and Celestia away. Acting Princess Cadance is willing to give Sunset a second chance, and hopes to have Sunset's help with a matter of national security.
A band of misfits must come together to foil corrupt Canterlot elite, war criminals, and old enemies. Meanwhile, Princess Twilight Sparkle must divert her attention between Equestria on the brink of war and a vengeful threat beyond the sea.
Wallflower Blush managed to erase the memories of the rest of the six girls. Now they have no memories of the friendships that were made in CHS. How is Sunset going to fix this? (An alternative touch to EG special: Forgotten Friendship)
Sunset Shimmer, in Equestria, Has to deal with being a part of Twilight Sparkle's team, per her request, despite her own feelings of inadequacy, regrets, fears, and worse of all, her newfound love for Twilight Sparkle. Can she ever earn it?
Sunset finds herself a bit surprised to see a stuffed shark on Twilight Sparkle's bed, and a bit more surprised Twilight's uncomfortable talking about it.
7DSJ sidestory. In the wake of Sunset's return and permanent departure from Equestria, Celestia wonders if she did enough for the unicorn that was like a daughter to her.
Running from herself, away from her mistake, Fiddlesticks found herself drawn to a country inn. There she meets Sunset Shimmer, sparking a night of introspection.
Uncontrolled magic is ripping through the fabric of reality, countless lives and the state of the world are at stake, and it's up to a teenager with mental health issues to fix everything. It seems like this may be a yearly occurrence at this point.
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.