The Legends abound of that Pony in The Blue Box, known throughout the world as The Doctor or Doctor Whooves. Children's books have been written, plays have been made, all based off these legends.
If it's true all Legends are based in Truth, where is this fabled Time-Traveler? Where did he dissapear to after his time on this world after being away for so long?
These questions are answered when a mysterious Blue Box falls out of the sky into the middle of Ponyville, right in front of a straw-blonde gray pegasus.
That is where our story begins... well, maybe a bit before that.
Maybe this Doctor isn't the same Doctor as this universe knew, maybe he is.
(This may seem a bit confusing, but it'll make sense, hopefully, once it gets going.)