After losing a good friend who will no longer remember him, an incident in the TARDIS causes the Doctor to get stranded in a parallel universe. Instead of just another parallel earth however, he finds himself in the world of Equestria where ponies rule. While the Doctor tries to get his head around the concept of magic, and Twilight sparkle tries to understand the TARDIS, a disaster occurs when the Doctor inadvertently reveals a terrible secret, and an old foe from the Doctor's past will try to take over Equestria. The Doctor and his knew found allies our the only ones who can save the day.