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 radio station Classic FM's Hall of Fame, a survey of classical music tastes. A revised version of Gold's 2010 arrangement had its debut over the opening titles of the 2012 Christmas special "The Snowmen", and a further revision of the arrangement was made for the 50th Anniversary special "The Day of the Doctor" in November 2013. Versions of the "Doctor Who Theme" have also been released as pop music over the years. In the early 1970s, Jon Pertwee, who had played the Third Doctor, recorded a version of the Doctor Who theme with spoken lyrics, titled, "Who Is the Doctor".