Watch The Day of the Doctor Online Free. Introduction to this special episode of Doctor Who 50th Anniversary. David Tennant and Billie Piper, who previously starred in Doctor Who as the Tenth Doctor and Rose Tyler, appear in the special. John Hurt will appear as a previously unknown, past incarnation of the Doctor, the "War Doctor", introduced at the end of the Series 7 finale "The Name of the Doctor". Joanna Page stars in this episode. Jemma Redgrave returns as Kate Stewart. The special will feature the return of the Daleks, as well as the return of the Zygons, shape-shifting aliens which up until now have only appeared in the 1975 serial Terror of the Zygons. Special note on this episode: On 4 November 2013, the BBC released the official synopsis: "The Doctors embark on their greatest adventure in this 50th anniversary special. In 2013, something terrible is awakening in London’s National Gallery; in 1562, a murderous plot is afoot in Elizabethan England; and somewhere in space an ancient battle reaches its devastating conclusion. All of reality is at stake as the Doctor’s own dangerous past comes back to haunt him."