Doctor Who Season 10 will be Peter Capaldi's final season as the Doctor. The new promo offers what seems to be the first glance at the Twelfth Doctor's regeneration. The final shot of the promo shows regeneration energy wafting off of the Doctor's hand.
This is somewhat unexpected since Capaldi was previously said to be sticking around through the 2017 Doctor Who Christmas Special. Perhaps the regeneration energy is intentionally misleading, or perhaps it comes towards the end of the season and will lead into the events of the Christmas Special.
Doctor Who Season 10 will also introduce Pearl Mackie as the new companion, Bill Potts, replacing the previous companion, Jenna Coleman's Clara Oswald, who left after Season 9. Whether she will join the new Doctor in Doctor Who Season 11 is still unknown
Doctor Who Season 10 will also see the return of Michele Gomez as Missy and John Simm as The Master. Given that Missy and the Master are the same Time Lord, it should be interesting to see what kind of time-travel shenanigans lead to both of them having a role in the new season.
Capaldi took over as The Doctor in Season 8, after Matt Smith's departure. After three seasons, he will depart the show alongside showrunner Steven Moffat, who has steered the series since Season 5. Moffat was a breakout writer during the Russell T. Davies seasons of Doctor Who.
Moffat will be handing the reins over to Broadchurch creator Chris Chibnall for Doctor Who Season 11. Chibnall is a longtime Doctor Who fans who also wrote for the series during the Russell T. Davies era and was head writer on the Doctor Who spinoff series Torchwood.
Chibnall will also be tasked with finding a new Doctor to replace Capaldi. Many fans are clamoring for a female Doctor, something that Moffat's seasons have laid the groundwork for, but Chibnall says the process has barely begun and so it's too early to tell.
Doctor Who Season 10 was preceded by the 2016 Doctor Who Christmas Special, "The Return of Doctor Mysterio." That episode introduced a superhero in New York City called The Ghost who is now living quietly with his ace reporter girlfriend. Some fans have speculated that he may have a role to play in the new season.
Doctor Who Season 10 premieres April 15 on BBC One and BBC America. On BBC America, this will be followed by the US premiere of new Doctor Who spinoff Class.
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- Classic Doctor Who Villains Returning For Season 10 Finale