Whoosh Whoosh A blue box appeared in the middle of some woods. A brown pony with a dark brown mane popped his head out of the strange box.
"....I'm the Doctor...."
It's the day of the Summer Sun Celebration and it's been 1,000 years since Nightmare Moon has been banished and now she's returning. The TARDIS takes the Doctor to the strange new land of Equestria. He ends up at the edge of Ponyville and meets Derpy. Together they both go on a quest to stop Nightmare Moon.
Note: Okay, so someone just told me that this looked a lot like someone else's story(I had no idea! :O ) So I am going to give some credit BaldDumboRat/Pierce Smoulder.
Sorry about that! ^^"