Capaldi made his first, very brief appearance as the Doctor in the show's fiftieth anniversary special "The Day of the Doctor" (2013), as one of the thirteen incarnations of the Doctor who are summoned to save Gallifrey from destruction.
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The Twelfth Doctor makes his first uncredited appearance in the programme's fiftieth anniversary special, "The Day of the Doctor", when thirteen incarnations of the Doctor unite to save his home planet of Gallifrey from destruction during the Time War.
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