Discord is the primary antagonist featured in The Return of Harmony Part 1 and Part 2. Previously, Princess Celestia and Princess Luna had imprisoned him in stone with the Elements of Harmony over a millennium ago. But when the Elements are transferred to Twilight Sparkle and her friends, Discord escapes from his stony prison and starts to wreak chaos. As his first move, Discord steals and hides the Elements of Harmony and offers a complex challenge in the form of a riddle as the only hint to their whereabouts. Twilight Sparkle and her 5 friends agree to play by his rules and venture off to retrieve the Elements of Harmony in order to stop him.
In The LBT-MLP Crossover TV Series, Discord Learned About The Dinosaur Emeralds When He Teamed Up With Red Claw And Victor Veloci. He Decied To Take Out Michael, And To Steal The Emeralds To Become Unstoppable.