In a time when war tears Equestria into two sides, the few who remain loyal to harmony are about to complete what could be the end of the war, and the end of Equestria
Twilight Sparkle is sent to a new world to face an old threat, only to find that this new world shares a lot more history with Equestria than she suspected.
After Sonic rescues Knothole from Dr. Eggman after a brutal defeat, he and several other Freedom Fighters are thrown through the multiverse to a land that is inhabited by quadripedal ponies and where chaos is absent, for the most part at least.