Sonic: Chaos in Equestria

Sonic: Chaos in Equestria is a fan fiction written by Snicketbar, or Snicket. It is a crossover of Sonic the Hedgehog and My Little Pony: Friendship is Magic. The story has a darker theme than usual fare, which starts with what appears to be a final confrontation between Sonic and Dr. Eggman, which results in the deaths of Sonic's friends, and the corruption of the Chaos Emeralds, resulting in Sonic being transformed into a crazed, murderous version of his super form Super Sonic. Before Sonic can kill him, in a last ditch effort, Eggman uses a portal machine to unwittingly send Sonic to Equestria, bringing the Chaos Emeralds with him.