The Doctor has seen more in his many life times than most could ever dream of. The birth of the universe, the death of thousands of planets, and of course the lives of ponies and humans alike. Now, however he has traveled into the far future with Ditzy only to have to seek out help. Help has come in the form of four Alicorn Princesses who explain what has happened to him. Add a regeneration, running for his and Ditzy's life and you have a recipe for being tired.