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Whovians, rejoice: fan favorites David Tennant and Billie Piper are returning for the science-fiction show's fiftieth anniversary special. The announcement came hours before part 2 of Doctor Who's seventh season premiered on Saturday. Tennant played the Tenth Doctor - that is, the tenth incarnation of the alien protagonist on BBC's popular series.

Mashable News David Tennant and Billie Piper to Return for 'Doctor Who' 50th Anniversary

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