The Day of the Doctor"[2][3][4] is the fiftieth-anniversary episode of the British science fiction television programme Doctor Who. It is written by Steven Moffat,[5] an executive producer alongside Faith Penhale.[6] It has been described by series producer Marcus Wilson as a "love letter to the fans" and by the controller of BBC One, Danny Cohen, as an "event drama".[5][7] It was shown on BBC One on 23 November 2013, in both 2D and 3D.[8][9] The special was broadcast simultaneously in several countries,[9] and was shown concurrently in 3D in some cinemas.[10]
David Tennant and Billie Piper reprised their roles as the Tenth Doctor and Rose Tyler, respectively, the latter by proxy.[11] John Hurt appeared as a previously unknown, past incarnation of the Doctor, the "War Doctor", introduced at the end of the Series 7 finale "The Name of the Doctor". Joanna Page starred as Queen Elizabeth I.[11] Jemma Redgrave returned as Kate Stewart.[12] The special featured the return of the Daleks,[13] as well as the return of the Zygons, shape-shifting aliens who had previously only appeared in the 1975 serial Terror of the Zygons.[14]
 
http://en.wikipedia.org/wiki/The_Day_of_the_Doctor


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