Discord, Chrysalis, and Vega, the spirit of Nightmare Moon, are back, and Equestria is gonna pay. Desperate for help, Celestia sends Luna to Asgard, in hopes that an old friend will help defend their country.
But the three villains have set their sights on Earth as well, and an attack on London sends Earth's Mightiest Heroes into action.
Assemble the Avengers and prepare for the war of the century.
No one is safe.

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