Two hundred years after the first Changeling invasion. Since then, ponykind has made many great achievements; powered flight, firearms, cars, massive ships; but the most important, most world-changing achievement has been the power to split the atom. They put this power to two uses; the helpful power to generate electricity for the world, and the destructive power of nuclear weaponry. With the changelings invading and the royalty systematically being assasinated, Celestia has only one option left: to utterly destroy the changelings.