Doctor Who (2013 specials) Doctor", saw the departure of Smith from the series and the introduction of Peter Capaldi as the Twelfth Doctor. "The Day of the Doctor" features the return of the Zygons for the first time since "Terror of the Zygons" in 1975. "The Time of the Doctor" draws together a number of plot threads that have run through the series since the Eleventh Doctor's first episode in 2010. <onlyinclude></onlyinclude> In "The Day of the Doctor", Smith and Coleman star alongside David Tennant and Billie Piper; Tennant reprised his role as the Tenth Doctor, while Piper, although credited as playing Rose Tyler,
Time War (Doctor Who) to Jack Harkness in "Utopia" that his resurrection by Rose was part of the final act of the War. Following what was for all intents and purposes the removal of the Time Lords, the Doctor believed himself to be the last of his race. The removal of the Time Lords also had a profound impact on time travel. In the 2006 episode "Rise of the Cybermen" when the Tenth Doctor, Rose Tyler and Mickey Smith are trapped in an alternative reality, the Doctor explains that, when the Time Lords were around, travel between parallel universes was less difficult but, with