Twilight was having a perfectly normal time waiting for the Doctor to show up, but when the TARDIS lands with a mare named the Professor in it instead of the Doctor, what can Twilight do? As the Professor and the Doctor explore their new worlds and meet some old new companions, they have one chance to get home, the winter full moon. Will all go well for the battling universes?

Luna lives her young filly years with her sister Celestia and a strange earth pony called the Doctor. She grows to love the stallion, but his fate is sealed and he is destined to live a different life than she. Will true love over come all?