We all know the story of the Mirror Portal. How Twilight Sparkle travelled through it, finding herself in a strange new world of even stranger creatures. Well, what if I were to tell you that that world was not the only one of its kind?
This fact becomes more and more apparent as strange ponies, never-before-seen creatures and even whole new places begin to appear in Equestria. And when a warlord from a lost universe appears, with his sights set on Equestria's crown and a face that's strangely familiar, so begins the strangest event in pony history: The Crisis on Infinite Equestrias