If Matt Smith is the only Doctor Who you've ever known, then you've seen some strange faces this season. In the first episode of this season, when the eleventh Doctor was facing down an alien set to destroy the Earth, it looked into his mind and saw several previous incarnations of the Doctor and various enemies he has bested.
Then again in episode 11, the Doctor had to transfer some of his memory to his roommate (yes, roommate), Craig Jones, and again, when saw some of the previous Doctors. If you saw 'Doctor Who: The Ultimate Guide,' you were brought up to date on the series reboot that started in 2005 with the Ninth Doctor, played by Christopher Eccleston, and continued with the Tenth Doctor, played by the immensely popular David Tennant.
But the history of this series stretches back to 1963, a year before the Beatles came to America, more than a decade before 'Star Wars' hit theaters, and decades before there was a BBC America.
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