The battle between Loki and the Avengers is altered by a twist of fate. Now stranded in the idyllic world of Equestria, "Earth's Mightiest Heroes" must find a way to unite alongside six colorful ponies to stop Loki's schemes.
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.