Long ago, in a magical pony land far far away: There were two pony princesses. Princess Celestia raised the sun every morning, Princess Luna raised the moon every night. But when Luna started to complain that her sister outshined her, Celestia used the most powerful magic known to ponydom to banish her to the moon.
Now it's been a thousand years, and prophesy states Luna will return. It's up to prized pupil Twilight Sparkle and her baby dragon slave to make sure that doesn't happen. But how can she warn her mentor, Princess Celestia when all these crazy ponies keep trying to be friends with her?