The Doctor, Twilight, Rarity and Pinkie Pie visit their first alien world in the TARDIS; the planet of Qing, and meet its exotic inhabitants, the Quilin. But not everything in this near-perfect utopia is as it seems.
Alone for the holidays, Scootaloo is drawn into a strange adventure with Spike and the Doctor as cheer and goodwill disappear from Ponyville's residents. Can they uncover the cause and fix the problem in time to save Hearth's Warming?
Starlight Glimmer is about to get her revenge on Twilight and her friends, she just has to stop that cyan pegasus from doing her rainbow trick. But before doing so, she receives a visit from a Doctor.
Twilight, Rainbow and Applejack travel 3000 years into the past with their new friend the Doctor, to the ancient city-state of Roan. They meet the famous Leonard DiHoovsie, and find themselves embroiled in a deep mystery with dark implications.
When Colgate, Ponyville's premier and only dentist, has a crisis of identity, she is swept up on a mad run through space, time, and beyond. Meanwhile, Sunset and a Trixie have borrowed the TARDIS.
Rumble hates winter. It reminds him of everything he's lost. So when the Doctor takes him back to visit a Frost Faire, he's less than happy. Things only get worse when murder enters into the matter. Will this Hearth's Warming be Rumble's last?