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Having contacted Paul McGann, who indicated his willingness to participate, Moffat then constructed the mini-episode to serve as an additional surprise for the fans, as well as serving as an introductory piece to "The Day of the Doctor".
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.
In the 50th anniversary special "The Day of the Doctor", the War Doctor steals the superweapon known as "the Moment" with the intent of wiping out all combatants in the war along with his home world of Gallifrey.