When a prison transport comes to a violent conclusion near Canterlot High, three dangerous convicts inadvertently escape through the school's portal and into Equestria. Taking on powerful new forms to compliment their already deadly nature, Twilight turns to Sunset for help in dealing with this foreign threat. Sunset quickly realizes the scope of what they are dealing with and calls upon Hunter to help her save her original world from these dangerous new enemies. Along the way, Sunset begins to realize just how human she has become and sees the fallout when the human world and Equestria collide.