Ten years prior to Friendship is Magic, the Doctor and Derpy arrive in Tartaurus to find murdered minotaurs and nightmarish creatures threatening to spill over into Equestria. Aided by Lieutenant Shining Armor, High Commisioner Plus-Four (who knows more about the Doctor than he is willing to say), and a pair of native Tartaurusians, the time-travelling duo discover secrets that have been kept from ponies for a thousand years and a villain who is even older than that.

This story is written in tribute to the 50th anniversary of Doctor Who, in the style of the classic Doctor Who series. It contains many references to things that piqued my interest in MLP: FiM, and attempts to put a bit of backstory on many elements of the show. I hope this story entertains you.