The pegasi that founded Equestria have a dark past, a past steeped in war and a fight for the survival of their very race, and one that Commander Hurricane played a key role in.
Across the great sea lies a continent that has remained unknown to almost all of Equestria. Only the royal sisters remember their once home, but with the awakening of a new Alicorn the lost land may once again know hope.
You are...you can't remember, so lets just go with Anon. You are Anon, and you have arrived upon Equestria as the result of a magical spell cast by Twilight Sparkle...your new roomate.
After the harrowing events of "Traveller," the Doctor is forced into having some downtime in Ponyville while the TARDIS rests. Meanwhile, Twilight goes to confide in her beloved mentor, but ends up learning far more than she expected.
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.