Battling Starlight Glimmer, Twilight finds herself in another alternate timeline. Only this time, she finds herself in the Golden Oak Library with the Princess of Friendship: Sunset Shimmer.
Something is wrong in Equestria, Discord's dragon tooth is missing! Its up to everypony's favorite Doctor and his companion to find and retrieve the tooth before its too late! can they make it? Find out in "Discord's Tooth." Allons-y!
After Discord failed to break up Twilight's friendships, he decides to trade places with a future Discord where the Elements would no longer exist. A future where, unknown to him, Discord has been reformed...