Twilight never became an alicorn princess and instead lost her life as a result of Star-Swirl the Bearded's unpredictable spell. But being dead doesn't prevent Twilight from visiting those she cares for...
Twilight Sparkle has lived a full life but now she's a 115-year-old pony lying on her deathbed and waiting to pass on. As her time draws near, she receives a visit from a mysterious mare who has come to seek out the answer to a simple curiosity.
The Doctor finds himself in Equestria following a violent regeneration and is forced to work alongside an annoyed Twilight Sparkle in order to defeat an old enemy.
Following an accident with the TARDIS, the Doctor finds himself in a strange universe with a new body that he didn't gain from regeneration. Meanwhile, a pegasus named Derpy is unaware that her life is about to change forever.