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The Fourth Doctor is the name given to the fourth incarnation of the fictional character known as the Doctor seen on screen in the long-running BBC television science-fiction series Doctor Who. He was portrayed by Tom Baker and is, as of 2008, the longest-running Doctor in Doctor Who history, having been on the show for seven continuous years (as opposed to the Seventh and Eighth Doctors who, although they each remained the "current" Doctor for more than seven years, did not spend that time on the air). |
Seventh Doctor vs Shalka Doctor, 
