Friendship Is Magic Part 1.An antisocial unicorn named Twilight Sparkle learns of a prophecy that states the evil Nightmare Moon will return during the upcoming Summer Sun Celebration after one thousand years of imprisonment in the moon. She tries to warn her mentor Princess Celestia of the impending danger, but she dismisses her and instead sends her to Ponyville to supevise the preparations for the celebration and make some friends. As a result, Twilight reluctantly meets five ponies in charge of the preparations: Applejack, Rainbow Dash, Rarity, Fluttershy and Pinkie Pie. At the celebration, Nightmare Moon appears and decrees everlasting night.