My first fanfic. Derpy meets a strange pony whom calls himself The Doctor. But, Who is this Doctor, and what is he doing in Ponyville?

WARNING: IT'S NOT THAT KIND OF STORY. Twilight and her friends have become younger in the TARDIS, while The Doctor goes back some previous incarnations. What has happened and how the Doctor will fix this?

This is a story of the bravest. This is a story about loyalty. This is a story about danger. This is a story about… Rainbow Dash

The weeping angles had trapped the Doctor in the past, so Derpy, Twilight and her friends must rescue him. If only the weeping angels weren't the only problem..

What did happen to the Changeling Kingdom before the arrival of The Doctor and Derpy? How it was destroyed?

The Doctor and Derpy land on a new planet. While it seems to be relatively peaceful, it hides a dangerous secret to the universe, specially to the Doctor.

The Doctor and Derpy land in 1518 CE, when Equestrian armies are fighting a war. But in the middle of the war, another enemy appears, these one came from the Doctor's past.