Fleeing from the Time Lords the Doctor accidentally damages the barrier between his own universe and that of Equestria an event that may lead to disaster for both universe. Now he must visit Equestria again and again to solve the problem.
Withholding their missing father's location, Discord ensnares a pair of siblings in a scheme to free the Sun from Princess Celestia's grasp. Twilight Sparkle and Rainbow Dash are sent in hot pursuit with orders to stop them at all costs.