Rintoo stays up all night watching scary movies. Wubbzy has transformed himself into a monster. Discord is a recurring character introduced in The Return of Harmony Part 1 and Part 2, serving as the main antagonist. Later in the series, Princess Celestia explains that Discord ruled over Equestria in a state of unrest and unhappiness, until she and her sister used the Elements of Harmony to imprison him in stone, until the spell broke after the Elements were no longer connected to the sisters. The word discord means "a lack of harmony" or "a disagreement".