The fourth season begins with a revealing two-part premiere in which the newly crowned Princess Twilight must balance her new royal duties and her friendship with the other ponies. Amid preparations for the Summer Sun Celebration in Canterlot, Princesses Celestria and Luna go missing and the Everfree Forest is taking over Equestria. These unexpected turn of events sends Princess Twilight and her pony friends on a quest to discover a mysterious foe who threatens to destroy everything. It is all up to Princess Twilight and her friends to help save Equestria from being destroyed. As part of the journey, PrincessTwilight is given the chance to discover the secret behind the Elements of Harmony.