When Shining Armor and Cadance come to Canterlot to celebrate the anniversary of their wonderful wedding with Twilight Sparkle and her friends, they are visited by a strange stallion who desperately needs their help. Surprisingly, the strange visitor is Shining Armor from an alternate world where the Canterlot Wedding was a complete disaster. In that world, the betrayal of her loved ones and the deaths of both Cadance and Queen Chrysalis drove Twilight mad and caused her to succumb to her darkest emotions and become Equestria’s newest and most dangerous enemy: Midnight Sparkle. Allied with King Sombra and the Crystal Empire, she has waged a vengeful and merciless war against all who do not support her. Do Twilight and her friends have what it takes to save a world where certain events happened differently from those in their world?