Twilight’s trip to Earth and friendship with the humans brings new friends and enemies to her peaceful world. With the specter of war hanging over them, Equestria will have to form an alliance like no other to fight the menace from the void.
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.