A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire.
Upon her return and when confronted by the new Bearers of the Elements of Harmony, Nightmare Moon decides to summon the foulest creature to ever exist (at least she thinks so).
A human with greek heritage is "lucky" enough to get a wish granted by no other than the Gods of the Olympus. His wish is granted, but the gods put their own little twist on it.
An impossible creature finds herself in a world which already knows everything about her. Slowly, she learns about the true nature of her own reality, her world's place in the cosmos, and herself.
The Crusaders learn that they aren't like other ponies. As they uncover the secrets of their origins, the trio grow closer than ever, discovering not only their unique nature, but the incredible power that comes with it as well.