Princess Celestia, in her infinite wisdom, sent Twilight Sparkle to Ponyville in order to learn about the Magic of Friendship; many years later, and after hundreds of adventures with the five amazing friends she made that day, she now stands watch over the last of them as they prepare for the end. Naturally, they refuse to go quietly into that good night.
After all, there's always time for one last spin around Equestria, right?