Twilight Sparkle, Celestia and Luna are transported into a strange alternate Equestria, the Land of Always Summer, where the day lasts forever and a terrible queen rules with an iron hoof.

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The Metro tunnels of Stalliongrad shelter the last remnants of ponykind from the ravages of the Apocalypse. Beneath the earth, ponies struggle to survive against mutants, radiation, and each other. But when an unstoppable threat emerges from the darkness of the Metro, one pony must brave the shadows to save not just his home, but the very existence of his people.