When Starlight is responsible for a massive accident, Equestria is faced with approving a system of checks and balances for former villains, fracturing the Mane Six, splitting Equestria down the middle, and testing the meaning of friendship.
Discord escapes from his stone prision and stells a gem called the gem of power. Because of this princess Celestia and her sister princess Luna have to summen help from another dimension. So they find Sonic and Shadow and bring them to thier world
After his adventure in the world of Camelot, Sonic is about to return home. The spell misfires and Sonic is sent to Equestria. There he meets new friends and an unfamiliar enemy he knows who he is. (Remake of Sonic and the Black Pony Knight)
As it is said, true peace can only be granted through countless innocent lives. In hindsight, the ponies were never that different from humans. Ultron’s plan is not over, and soon his strings will be severed for the last time.