Bbc

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A 2006 handout photo made available by the BBC from an episode of "Doctor Who" showing Billie Piper, left, as Rose Tyler and David Tennant as The Tenth Doctor. "Doctor Who" is turning 50 and the BBC is throwing a broadcasting blowout for the sci-fi show, which began with little fanfare and few expectations on Nov. 23, 1963 but is now one of its biggest hits and major exports. (AP Photo/BBC, Mike Hogan)

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An undated handout photo made available by the BBC showing the Eleven Doctors, from left, William Hartnell, Patrick Troughton, Jon Pertwee, Tom Baker, Peter Davison, Colin Baker, Sylvester McCoy, Paul McGann, Christopher Eccleston, David Tennant and Matt Smith. "Doctor Who" is turning 50 and the BBC is throwing a broadcasting blowout for the sci-fi show, which began with little fanfare and few expectations on Nov. 23, 1963 but is now one of its biggest hits and major exports. (AP Photo/BBC)

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A 1975 handout photo made available by the BBC from an episode of "Doctor Who" showing Tom Baker as The Fourth Doctor. "Doctor Who" is turning 50 and the BBC is throwing a broadcasting blowout for the sci-fi show, which began with little fanfare and few expectations on Nov. 23, 1963 but is now one of its biggest hits and major exports. (AP Photo/BBC)

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An undated handout photo made available by the BBC from an episode of "Doctor Who" showing William Hartnell as The First Doctor. "Doctor Who" is turning 50 and the BBC is throwing a broadcasting blowout for the sci-fi show, which began with little fanfare and few expectations on Nov. 23, 1963 but is now one of its biggest hits and major exports. (AP Photo/BBC)

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An undated handout photo made available by the BBC from an episode of "Doctor Who" showing Christopher Eccleston as The Ninth Doctor. "Doctor Who" is turning 50 and the BBC is throwing a broadcasting blowout for the sci-fi show, which began with little fanfare and few expectations on Nov. 23, 1963 but is now one of its biggest hits and major exports. (AP Photo/BBC)