9. The Return Of The Master

The Master disappeared at the end of the Tenth Doctor's run, displaced into the Time War with Rassilon and the High Council. Could his presence have changed the outcome of the war? Did he somehow escape again? If so, let's see him return to challenge the Doctor again as a recurring antagonist. Their relationship was very much like Sherlock Holmes and Moriarty - The Master has encountered almost every version of the Doctor, except for the Ninth. He was a master of disguise, adept at mind control and was the Doctor's intellectual equal. The Master would be a great foil to the Doctor, as he always seemed to evade capture after his plans came undone.