Twice Upon a Time (Doctor Who) The Doctor paraphrases philosopher Bertrand Russell when he advises his future self that "hate is always foolish and love is always wise". Peter Capaldi reprised his role as the Twelfth Doctor. On 30 January 2017, he confirmed that the tenth series would be his last, and that he was set to leave after the 2017 Christmas special. The episode also sees the introduction of Jodie Whittaker as the Thirteenth Doctor, whose casting was announced on 16 July 2017. David Bradley appears in the episode as the First Doctor, having previously portrayed William Hartnell in the docudrama "An Adventure in Space
The Doctor (Doctor Who) "who"). The Master was utilising Latin translation in the same serial, posing as "Mr Magister". The Eighth Doctor's companion Grace briefly refers to him by the alias "Dr. Bowman" in the 1996 "Doctor Who" television movie. In "The Wheel in Space" (1968), his companion Jamie McCrimmon, reading the name on medical equipment, tells the crew of the Wheel that the Doctor's name is "John Smith". The Doctor subsequently adopts this alias numerous times over the course of the programme, sometimes prefixing the title "Doctor" to it. In the audio adventure, "The Sirens of Time", when the Fifth Doctor is asked