Queen Chrysalis returns and with her dark magic she breaks open Discord's rock hard casing. With these two super-powers they bring the powers of chaos and dark magic together and resurrect King Sombra. With these villains united as one body they decide to get revenge on Princess Celestia and the Mane six. With Equestria in grave danger, Princess Celestia calls upon the Mane six to work together and get rid of this seemingly never ending problem.