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The season finale of Doctor Who reveals the future of Ncuti Gatwa on the show and a cliffhanger likely to excite and enrage fans in equal measure
Were the leaks real? What does the future of Doctor Who look like? We have at least one answer to those questions after the Doctor Who finale 'The Reality War' debuts on BBC and Disney+

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Spoilers for the season finale of Doctor Who, 'The Reality War,' follow. Do not read on unless you want to be spoiled. Seriously.
The rumors, at least when it comes to the BBC’s Doctor Who, were true.
As had been leaked before the final episode of the long-running show’s current season, ‘The Reality War,’ had aired, Ncuti Gatwa has been replaced as the Doctor, regenerating in the final moments of the episode — into none other than Billie Piper, who had previously been a mainstay of the series from 2005 through 2006, with multiple reappearances in the show since.
Piper’s first words as the Doctor were simple: “Oh, hello!”
This isn’t the first time that the Doctor has regenerated into an actor who had previously been seen in the show; the Twelfth Doctor, Peter Capaldi, had played Lobus Caecilius in the 2008 episode ‘The Fires of Pompeii,’ as well as John Frobisher in spin-off series Torchwood, before becoming the Doctor in 2013’s ‘The Time of the Doctor.’ Similarly, the Fourteenth Doctor was the Tenth Doctor, David Tennant. In both cases, it was stated that the Doctor ‘chooses’ faces for their regenerations, as opposed to inventing them or leaving them entirely to chance. This is somewhat at odds with comments in other episodes, but keeping track entirely of Doctor Who canon is a tricky business at best.
The regeneration of the Doctor — and departure of Gatwa as lead actor after only two seasons and two special episodes (technically two-and-a-bit, given that he actually debuted at the end of 2023's 60th anniversary special 'The Giggle') — reveals why the BBC was so cagey in its response to media reports that Gatwa had been fired from the series: his final episode had been shot way back in May 2024, when the current season finished production, and so while he was leaving the series, the idea that he had been fired in response to ratings was untrue. (His first season only started airing on the BBC and Disney+ in May 2024, for context.)
For those keeping track, the Sixteenth Doctor is the third role Billie Piper has played on the series; she played Rose Tyler from 2005 through 2006, with guest appearances in 2008. She then played The Moment in 2013's 50th anniversary episode 'The Day of the Doctor,' who intentionally chose to look like Rose.
In a statement released by the BBC, Piper said, "It’s no secret how much I love this show, and I have always said I would love to return to the Whoniverse as I have some of my best memories there, so to be given the opportunity to step back on that TARDIS one more time was just something I couldn’t refuse, but who, how, why and when, you’ll just have to wait and see."
Showrunner Russell T. Davies added in his own statement, "Billie once changed the whole of television, back in 2005, and now she’s done it again! It’s an honour and a hoot to welcome her back to the TARDIS, but quite how and why and who is a story yet to be told. After 62 years, the Doctor’s adventures are only just beginning!"
While audiences now know who the new Doctor is, it’s less clear when they’ll appear. Officially, the show has yet to be renewed for a new season, and no announcement has yet been made about a Christmas Special for 2025. Similarly, no announcement has been forthcoming from Disney+ as to whether it will extend its production partnership and distribution deal with the BBC for the show, which only includes the previous two seasons, specials from 2023 through 2024, and upcoming spin-off series The War Between The Land and The Sea.
As anyone familiar with its production history knows, it’s deeply unlikely that the show is over even absent any news about its future; it has already survived a hiatus from 1989 through 2005, and so any such pause in the near future feels easily surmountable… and, given the surprise appearance of that particular new Doctor, it’s unlikely to be too long before the cliffhanger is continued and explained in some format — something made particularly clear by Davies and Piper's teases of a story waiting to be told.
Doctor Who is available on BBC iPlayer in the United Kingdom, and Disney+ internationally, now.
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