In the BBC press release, Chibnall is quoted as saying: 'I wish our successors - whoever the BBC and BBC Studios choose - as much fun as we've had. On 29 July 2021, the BBC announced that Chris Chibnall, who served as executive producer and showrunner of the series since 2018, would depart the series after a run of specials in 2022, alongside Thirteenth Doctor star Jodie Whittaker. On 23 September, the BBC revealed that Jemma Redgrave, who had previously been announced to be appearing as Kate Stewart in the upcoming series, would also appear in the specials. On 14 September 2023, Miriam Margolyes was announced to be joining the cast of the specials as the voice of The Meep.

Bernard Cribbins is set to posthumously appear as Wilfred Mott. The BBC later confirmed the surname of the character to be Noble, revealing that Finney will play the daughter of Donna and Shaun. Yasmin Finney joined the cast for the anniversary to portray a character named Rose. On 25 December 2022, it was announced that Jacqueline King and Karl Collins are also set to return as Sylvia Noble and Shaun Temple, respectively, who last appeared in Tennant's final story of his tenure as the Tenth Doctor, ' The End of Time', and that Ruth Madeley would appear as Shirley Anne Bingham. On 13 June 2022, Davies announced that Neil Patrick Harris would be joining the cast as a villain, later revealed to be the Toymaker, a character last seen in The Celestial Toymaker (1966) portrayed by Michael Gough. Ncuti Gatwa will make his debut appearance as the Fifteenth Doctor.

Tennant will appear as the Fourteenth Doctor for the first time while Tate will reprise her role as Donna Noble. See also: List of Doctor Who cast members Tate and Tennant, who will appear as Donna Noble and the Fourteenth Doctor as part of the show's 60th anniversaryĭavid Tennant and Catherine Tate will both return to the series as part of the 60th anniversary specials.

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