One of the most violent and heartless inmates of Arkham Asylum gets thrown into the world of Equestria. Stuck in an innocent world he is forced to become its unwilling savior as more of Arkham's crazies arrive to cause mayhem. Along the way he meets a group of ponies that will try to show him the meaning of friendship and something about that yellow pony just won't leave his mind. And watch as something inside him slowly eats away at whatever humanity he has left.

Takes place before season 4 premiere