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,
Rose (Doctor Who episode) (Christopher Eccleston) plot to prevent an invasion of the Earth by the Nestene Consciousness (voice of Nicholas Briggs) and the Autons after the Doctor destroys Rose's workplace. The episode marked Eccleston's first appearance as the Doctor, succeeding several other actors who played the role, and Piper's debut as the Doctor's travelling companion Rose. Being the first episode of the revived series, several recurring characters were introduced: Camille Coduri as Jackie Tyler, and Noel Clarke as Mickey Smith. Viewers did not see the Doctor character regenerate from a previous incarnation, regeneration being a plot device in which the character of the