This story is a sequel to My Little Doctor Whooves: Horsing Around
Twilight Sparkle, Rainbow Dash, and Applejack are now the newest passengers aboard the TARDIS with the newly regenerated Doctor. And for their first adventure, they go to one of the most important points in Equestria's history: the Fall of Discord.
But something's not right. Instead of being defeated, Discord is practically unstoppable. It's up to these time-traveling ponies to find out what went wrong and how to make it go right.