One year has passed since the crusaders have returned, and all was well in Equestria, until three more mysterious mares appear sporting weaponry similar to the Crusaders. But these three look oddly familiar, Twilight and her friends now listen to yet another story off these three mares claiming to be Derpy Hooves and her two daughters.

They tell a story of a land drenched in nuclear flame, and of a dangerous and violent place… called the Metro.