Aston Fisk, an Inquisitor, is thrown into the Equestria we know after attempting to silence a Heretic's attempt at bringing death and destruction upon our world.

A human, USMC Scout Sniper is sent to a soon-to-be dystopian Equestria

The war against the Changelings isn't faring too well, and now, seven years after the Canterlot invasion, Spike is now old enough to help win the war.