King Sombra has returned, and he seeks to pick up where he left off and conquer the Crystal Empire once and for all! He's already managed to gain control of many of the guards there, and is marching right on into the palace, ready to overthrow Cadance and her family. He's even entered the chamber of her beloved daughter, Flurry Heart, and is confident that he cannot be stopped.

Unfortunately, he's failed to take into consideration just how much trouble an upset super-powered alicorn toddler can be.