text: Since 2018 Whittaker's first series as the Thirteenth Doctor began its broadcast in late 2018. Bradley Walsh, Tosin Cole and Mandip Gill replaced Mackie and Lucas as the companions for the show. The twelfth series saw the reintroduction of the Master, this time played by Sacha Dhawan who recurred across the series. Meanwhile, Barrowman briefly returned to Doctor Who as Harkness in "Fugitive of the Judoon", after a ten year absence from the series, and starred in the 2021 New Year's Day special, "Revolution of the Daleks". "Fugitive of the Judoon" also introduced a new, previously unknown, incarnation of the Doctor referred to as the Fugitive Doctor portrayed by Jo Martin, a role that carried over into the thirteenth series and subsequent specials.
  Walsh and Cole left the series following "Revolution of the Daleks", and were succeeded by John Bishop for the thirteenth series. Whittaker, Gill, and Bishop continued their roles through the 2022 specials; Whittaker then departed alongside Gill, and Bishop. The final special, "The Power of the Doctor", commemorating the BBC's centenary, saw the return of David Bradley, Peter Davison, Colin Baker, Sylvester McCoy, and Paul McGann as the First, Fifth, Sixth, Seventh, and Eighth doctors, respectively. Sophie Aldred and Janet Fielding also starred in the episode, reprising their roles as Ace and Tegan Jovanka. Walsh briefly returned in the episode as well, with William Russell, Katy Manning, and Bonnie Langford portraying former companions Ian Chesterton, Jo Grant, and Mel Bush. With his appearance, Chesterson broke the Guinness World Record for "longest gap between TV appearances as the same character" with over 57 years since his last appearance in 1965.