It's just a normal and unimportant day in Ponyville. Birds are singing, Maud is super excited about rocks and Pinkie Pie is being monotone about a party... wait what?
Changeling hives are vanishing with no trace left behind, who, or what is hunting the changeling race? And what fate awaits Queen Twilight Sparkle and the rest of her hive?
The Doctor had been in Equestria for a year and in that time he has seen wonders, but what happens when something, or someone changes Equestria's history and only the Doctor is aware?