An Adventure In Space and Time

From: Wikipedia

In 1966, William Hartnell (David Bradley) is sitting in his dressing room at the BBC as a stagehand calls him to stage, only to be shunned away by the angry Hartnell. On the set, shooting The Tenth Planet, the other actors are bothered by his absence, as he suddenly enters in costume, ready to film what is revealed to be his final scenes as the the Doctor. As he stands by the TARDIS console, he closes his eyes and remembers his years as the Doctor. After recollecting all his time on the show he prepares to film his last scene. As the cameras begin to come on, he turns on the time rotor, before looking across the console, to see Matt Smith, in the Eleventh Doctors outfit, smiling back. Content with the knowledge that Doctor Who will go on, Hartnell begins filming his final scene as the show ends.

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