You've heard RDD's Lunaverse, right? Well, I've declared myself head of the Candanceverse, or Candenzaverse, because it just seems more right. So, in the Cadanzaverse both Luna AND Celestia go evil, and it takes around a hundred years for Candance to go and fix things. 900 years after Cadance banished The Tyrant Sun and Nightmare Moon, Equestria has entered a Hyper-Industrial Revolution, and, as Ponyville's Winter-Wrap is ending, Twinkleshine is put in charge of Ponyville's first ever colour-moving-picture channel, and goes to live there, having custody of changeling nymph after a clerical error, then, as the Spring Dawn Celebration commences, Nightmare Moon escapes, Twinkleshine's attempt at defeating Nightmare Moon alone only manages to release the Tyrant Sun, but Snow Catcher, Octavia, Crimson Gala, Lily Blossom, and Flitterheart tag along with Twinkleshine, and the use to the power of the Elements of Harmony to (seemingly) defeat The Tyrant Sun.