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
An Adventure in Space and Time was in the Season 21 serial "Frontios"; Mark Eden appeared as the title character in the Season 1 serial "Marco Polo"; Nicholas Briggs, who has voiced the Daleks since the series was revived in 2005, portrayed his own predecessor; and Brian Cox voiced the Elder Ood in "The End of Time". Jean Marsh and Anneke Wills, who both played companions to Hartnell's First Doctor also appeared during Verity Lambert's leaving party scene. The drama was watched by 2.71 million viewers in the UK. Rotten Tomatoes gave it a 95% approval rating based on 22 reviews, and an average score of