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,
Doctor Who (series 1) the BBC. Davies voluntarily wrote a pitch for the series, the first time he had done so; he previously chose to jump straight to writing pilot episodes because he felt that a pitch would "feel like [he's] killing the work". The fifteen-page pitch outlined a Doctor who was "your best friend; someone you want to be with all the time"; the eighteen-year-old Rose Tyler as a "perfect match" for the new Doctor; avoidance of the forty-year back story "except for the good bits"; the retention of the TARDIS, sonic screwdriver, and Daleks; removal of the Time Lords; and also a