Equus has been overrun by a combination of changelings and hoards of parasprites. Equestria remains the only remaining bright spot left on the planet. Princess Celestia is confronted with a terrible choice. In order to save her little ponies along with many refugees from across Equus, she must sacrifice the population of a world which has done nothing against her.

However the planet that the equestrians find themselves on is not as doomed as they first believed.

a MLP:FIM/ DCU crossover