 This story is a two-part finale to Season Forty Two (New Series 15) where The Doctor and Belinda find themselves in a strange world. It saw the continuation of The Pantheon, with the introduction of the infant Desiderium, the God of Wishes, as well as The Doctor encountering two incarnations of The Rani and the return of Omega.
This story was written by Russell T Davies and directed by Alex Sanjiv Pillai.
The cast as well as bringing together Ncuti Gatwa as the Fifteenth Doctor, plus companions Belinda Chandra (Varada Sethu) and Ruby Sunday (Millie Gibson) also included Jonah Hauer-King as the recent villain Conrad who Ruby Sunday got involved with in "Lucky Day".
The guest cast for this story also includes: Millie Gibson, Anita Dobson, Archie Panjabi, Bonnie Langford, Jemma Redgrave, Alexander Devrient, Ruth Madeley and Yasmin Finney.
After the premiere of "The Interstellar Song Contest", which ended with the reveal that Mrs Flood was The Rani as she bi-generated into a new incarnation played by Archie Panjabi, the official Doctor Who Instagram account revealed official images from this story confirming that Archie Panjabi would be appearing in this story. She was previously omitted from the official cast list.
Regarding Archie Panjabi's casting as The Rani, Russell T Davies has revealed that it was felt that it was ‘vital’ to cast an Indian actress in the role, acknowledging that ‘Rani’ is a Sanskrit word, the name meaning ‘Queen’. ‘I think it was vital to cast an Indian person as The Rani. Let's face it, I'd cast Archie Panjabi as anything! But Phil Collinson had worked with her on Sea of Souls and it helps when someone has worked with an actor before. She was straight in! She dived into it and knew of Kate O'Mara and the history. She was an instant yes and an absolute joy to work with’.
Steph de Whalley as Anita Benn, Nicholas Briggs as the voice of Omega, Jodie Whittaker as the Thirteenth Doctor and Billie Piper were also left off the advance cast list. Nicholas Briggs is also not credited as the voice of the Vlinx for the first time since this character's introduction.
Jonathan Groff as Rogue was also omitted from the advance cast list. His cameo was filmed during the production of the 2024 story "Rogue" in May 2023.
As part of a scheme set up by Bad Wolf Productions to address the under-representation of women of colour in directing, Avril Evans was brought on as a placement director mainly during the pre-production stages. She shadowed Alex Sanjiv Pillai for three months and also was able to direct a few scenes herself. One such scene was when The Rani was picked up and eaten by Omega.
The title of this story's first episode was revealed on official social media on the 22nd March 2025.
In an interview with TV Choice magazine, published on the 8th April 2025, Russell T Davies revealed that this story would have ‘some great physical creations and some great CGI creations’. He also revealed that it would feature a location known as the ‘Bone Palace’.
This story includes archive footage from the 1972 Third Doctor story "Day of the Daleks". This footage comes from the 2011 special edition, that was released on DVD, as it includes Nicholas Briggs's dubbing of the Dalek voices and the new version of the Dalek's interrogation screen. This is the second time that footage from a special edition of a television story is used, following the 2024 story "The Legend of Ruby Sunday/Empire of Death", making use of footage from the Tales of the TARDIS edition of "Pyramids of Mars". This was coupled with a purposely filmed Dalek moving across the foreground as the director wanted to work with a Dalek.
Russell T Davies posted that filming for this story and season wrapped on the 25th May 2024.
The Doctor Who: Unleashed episode for the second part of this story covered The Doctor saying goodbye to Belinda and Poppy. It covered almost entirely the production of material from the final half hour of the second episode, including Jodie Whittaker's appearance, The Doctor's regeneration, and the final scene in UNIT Tower, which was indicated to be the last scene to be filmed. This final scene is after Belinda and Poppy emerge from the Zero Room, where characters other than The Doctor and Belinda have changed costumes and hairstyles, Sienna-Robyn Mavanga-Phipps (Poppy) is much older, and Rose Noble is absent with no explanation. The UNIT Tower set in the Unleashed episode features several slight upgrades, such as new visuals for the screens and the Vlinx having more pronounced lighting for its tubes.
The Rani mentions a past encounter with The Doctor at the Siege of Persephone, where she claims that they danced together as a city burned.
When John Smith remembers that he is really The Doctor, clips of previous incarnations of The Doctors are seen. These are: the Abbot of Amboise (from "The Massacre of St. Bartholomew's Eve")], the Second Doctor ("The Three Doctors"), the Third Doctor ("Day of the Daleks"), the Fourth Doctor ("The Invasion of Time"), the Fifth Doctor ("The Five Doctors", the Sixth Doctor ("Vengeance on Varos"), the Seventh Doctor ("The Curse of Fenric"), the Eighth Doctor ("The Power of The Doctor"), the War Doctor ("The Day of The Doctor"), the Ninth Doctor ("Rose", the Tenth Doctor ("Silence in the Library/Forest of the Dead"), the Eleventh Doctor ("The Wedding of River Song"), the Twelfth Doctor ("Under the Lake/Before the Flood"), the Thirteenth Doctor ("The Ghost Monument"), the Fugitive Doctor ("Fugitive of the Judoon") and the Fourteenth Doctor ("The Power of The Doctor").
While looking for The Doctor, Anita Benn sees the Eleventh Doctor playing live chess ("The Wedding of River Song"), the Third Doctor being interrogated by a Gold Dalek and his subordinates ("Day of the Daleks") and the Fifteenth Doctor dancing with Rogue ("Rogue").
In Ruby Sunday's bedroom she has posters for the band HL3. Another HL3 poster was seen in "The Robot Revolution".
The Rani recognises Melanie Bush from their encounter on Lakertya in the 1987 Seventh Doctor story "Time and The Rani".
The Fifteenth Doctor and the Thirteenth Doctor discuss her feelings for Yasmin Khan, as established in the 2022 Thirteenth Doctor stories "Eve of the Daleks" and "Legend of the Sea Devils".
Carla Sunday once again turns against her daughter Ruby in an alternate reality. As in "73 Yards" Ruby's experience with the alternate timeline in that story allows her to be aware that something is not right in this story.
Susan Triad becomes a tea lady identical to the Angel of Death encountered by The Doctor and Ruby in 1963 (see "The Devil's Chord").
Susan Triad recalls her being born from the TARDIS a year prior, as established in the 2024 story "The Legend of Ruby Sunday/Empire of Death".
With the reveal at the end of the previous story ("The Interstellar Song Contest") that Mrs Flood (as played by Anita Dobson) is actually The Rani - or rather ‘a Rani’ as in this story she becomes one half of the newly bi-generated duo. Mrs Flood emerged from this bi-generation immediately subservient to an apparently more dominant version of herself (played by Archie Panjabi) who announced that she is the definitive article.
The Rani made her debut in the 1985 Sixth Doctor story "The Mark of The Rani" and had previously only been portrayed on-screen by Dynasty legend, Kate O’Mara.
The return of The Rani has been long awaited. Ever since the revival of Doctor Who in 2005, every time a mysterious female character appeared there was the inevitable chorus from fans of ‘It’s The Rani!’. But now, as has been widely remarked, The Rani is just like a bus, you wait forever for one and then two of them turn up at once.
During the mid-credits scene at the end of "The Interstellar Song Contest" The Rani announced ‘As for The Doctor... I will bring him absolute terror!’.
The Rani though is more than just a female version of The Master. She was portrayed as a scientist first and foremost, carrying out experiments that the Time Lords deemed too barbaric. She cared little for the collateral damage that lay in her wake, and her callousness apparently earned her a spot just below The Master on the Time Lord’s most wanted list.
The Rani mentions that the old Gallifrey didn’t appreciate her, alluding to her exile first established in 1985 Sixth Doctor story "The Mark of The Rani". In order to preserve the true personality of the 1980s Rani, she remained a cold-blooded scientist with a thirst for knowledge who viewed The Doctor as completely beneath her contempt, rather than an arch-nemesis that must be destroyed at all costs.
The character was created by husband and wife writing duo, Pip and Jane Baker. The producer of Doctor Who at the time, John Nathan-Turner, proposed bringing in a Time Lord adversary in addition to The Master. It was Pip and Jane who suggested that this should be a female character.
The Rani made her final appearance in the 1993 Children in Need special "Dimensions in Time", where she terrorised the residents of Albert Square, in a Doctor Who/EastEnders cross-over which included Anita Dobson (who played the iconic Queen Vic landlady Angie Watts) - so creating the ultimate clue to Mrs Flood’s true identity.
When The Rani is reminding The Doctor of their previous adventures, clips are shown (with the aspect ratio changed and footage visually extended) from "Dimensions in Time", "The Mark of The Rani" and "Time and The Rani". This marks the second time footage from "Dimensions in Time" has been used within the show, following a picture of the Third Doctor that is seen in "Rogue".
Mrs Flood is heard to refer herself and her successor as ‘The Two Ranis’ and used the catchphrase of ‘that's goodnight from me!’ - mimicking the comedy sketch duo The Two Ronnies.
The Doctor calls The Rani, Conrad Clark and Desiderium: ‘The Unholy Trinity’.
This story is set on a version of Earth dictated entirely by the whims of Conrad Clark. Having abducted the infant God of Wishes, part of the all-powerful Pantheon, The Rani uses its abilities - combined with Conrad's warped imagination and 'a web of titanic power' created by The Doctor's vindicator - to shape an idyllic world which is in fact anything but.
There is a sinister seam running through Conrad's world and anyone who does not fit with his ideals is made quite literally invisible. Eventually, everyone from Belinda - recast as the wife to The Doctor's alter ego John Smith - to Ruby Sunday and former UNIT Scientific Adviser, Shirley Anne Bingham, begin to doubt the legitimacy of Conrad's world... but this is all part of The Rani's plan. As Mrs Flood states 'The doubts are not the problem. The doubts are the whole point'.
As The Rani explained: 'If you question hard enough, then doubt can crack open the world and if ordinary doubt cracks open the world, then a Time Lord's doubt rips open up the structure of reality itself'. In short, The Rani created the Wish World with the intention of destroying it - because the resulting break in reality will open up a realm called the Underverse, where 'the one who is lost' dwells. This being revealed as... Omega. And, as explained by Conrad, 'Omega, the first Time Lord. The creator of the Time Lords. The greatest and most terrifying Time Lord of all'.
Omega is a legendary Time Lord, renowned for his role in harnessing the power of a star to enable time travel, effectively laying the foundations of the Time Lord civilisation. However, during this experiment, Omega was thought lost in a black hole, where he survived in an antimatter universe, consumed by bitterness and madness. Believing he had been abandoned, Omega became a tragic villain, seeking revenge against the Time Lords.
Omega was first introduced in the 1972 Tenth Anniversary story "The Three Doctors", starring Jon Pertwee, Patrick Troughton and William Hartnell, where they discover that Omega is responsible for a mysterious energy force that begins attacking UNIT headquarters and is draining power across the universe. The Time Lords, facing a crisis, break their own rules to unite the First Doctor, the Second Doctor and the Third Doctor to confront Omega. There it is discovered that his existence in the antimatter realm makes it impossible for him to return to the real universe and so he uses the energy of a black hole to try to escape and take revenge. But ultimately, Omega is tricked into destroying himself by having him handle a physical object (the Second Doctor's Recorder) which is something impossible in his realm, thus causing his antimatter world to collapse.
Omega would not be seen again for another 10 years, eventually reappearing in the 1983 Fifth Doctor story "Arc of Infinity" when Omega again schemes to return to the real universe, by bonding with The Doctor (played by Peter Davison). Omega, now resembling The Doctor, travels to Earth but his stolen body begins to decay and in a final confrontation, The Doctor is forced to use an antimatter converter to banish Omega back to his universe.
The Fifth Doctor encountered Omega again in the Big Finish Production audio story "Omega". Omega also briefly controlled The Sixth Doctor in the Make Your Own Adventure with Doctor Who novel "Search for The Doctor".
Kate Lethbridge-Stewart is heard to mention her father (The Brigadier)'s encounter with Omega in "The Three Doctors".
It is unclear if the 'Underverse', referred to by The Rani in this story, is the same antimatter realm where we last left Omega or if he has somehow been transported to a new domain since the events of "Arc of Infinity".
The actor Stephen Thorne originated the role of Omega in "The Three Doctors", appearing throughout as a masked figure - with Omega's physical body eventually revealed to have been evaporated by his time spent in the antimatter realm. The role was recast for "Arc of Infinity", with Ian Collier in a redesigned version of the villain. Peter Davison also played the part of Omega when he assumed The Doctor's physical form.
In this story it is not clear if this is the last we shall see of Omega as when the Wish World is destroyed and the gateway to the Underverse cracks open, we hear a voice boom 'Long live Omega! Omega shall be free!'.
Omega's lines were taken from the Gallifrey audio story "Intervention Earth", marking the first time archive audio from Big Finish Productions has been used in a televised Doctor Who story.
Omega is shown to be associated with a symbol which previously appeared on Omega's medallion in "Arc of Infinity".
The villains of this story have been dubbed 'The Unholy Trinity', but Russell T Davies confirmed on Instagram that both incarnations of The Rani counted as one member, Conrad Clark counted as another, whilst ‘the third is lying in wait, exactly 160 years away’ - this story revealed this to be Desiderium, who was born in 1865, 160 years prior to 2025 when most of this story is set.
Both The Doctor and The Rani note that the Time Lords are sterile as a result of the genocide of the Time Lords, which occurred sometime prior to the events of "Spyfall". This gives a secondary source to the Time Lords sterility after Pythia's Curse as learnt by the Seventh Doctor in the Virgin Books' The New Adventures novel "Cat's Cradle: Time's Crucible".
This is one of eleven television stories in which the TARDIS does not appear at all. The others being: "Mission to the Unknown", "Doctor Who and the Silurians", "The Mind of Evil", "The Dæmons", "The Sea Devils", "The Sontaran Experiment", "Genesis of the Daleks", "Midnight", "The Lie of the Land" and "The Woman Who Fell to Earth".
The room Conrad Clark is broadcasting from is confirmed to be a TARDIS console room, although this is not revealed until the second episode.
The Thirteenth Doctor notes the changed TARDIS control room and states that she does not like it. The Second Doctor and the Tenth Doctor made similar remarks to their successors in "The Three Doctors" and "The Day of The Doctor", respectively.
The Rani is seen to use a Time Ring to get to Earth. A Time Ring was first seen in the 1975 Fourth Doctor story "Genesis of the Daleks". The Doctor is heard to call The Rani a ‘poor baby’ and the two share a laugh over the idea of her not using a TARDIS. The Tenth Doctor had a similar dismissive attitude towards time travelling without a TARDIS during the 2007 Tenth Doctor story "Utopia" - specifically via the use of a vortex manipulator, which was described by Missy as being ‘cheap and nasty time travel’ during the 2015 Twelfth Doctor story "The Magician's Apprentice/The Witch's Familiar".
Throughout this story, Conrad Clark reads books from the Doctor Who series. These were; Doctor Who and the Last Time War, Doctor Who and the English Rose, Doctor Who and the Big Bad Wolf, Doctor Who and the Runaway Bride, Doctor Who and the Pandorica, Doctor Who and the Timeless Children and Doctor Who and the Deadly Wish.
In Russell T Davies' episode guide, that was published in the 12th - 18th April 2025 issue of the Radio Times, he teased that this story would feature ‘Bone Beasts’, ‘The Dispossessed’, and have Mrs Flood ‘hiding in the sky’.
The treatment of those with disabilities in this story is similar to what occurred in the Big Finish Productions audio story "Girl in a Bubble", where the Sixth Doctor encountered an alternate timeline of Earth caused by Patricia McBride, where his disabled companion Hebe Harrison (played by Ruth Madeley) was made to live in the fringes of society due to her disability.
The building seen next to the UNIT Tower is a Gestetta building. Gestetta were a mining company from "The Well".
A Zero Room first appeared in the 1982 Fifth Doctor story "Castrovalva" - a special room (which in "Castrovalva" was located in the TARDIS) that was described as a neutral environment, cut off from the rest of the universe that is used by the Time Lords after a difficult regeneration.
The Doctor says he may see Belinda and Poppy again, ‘but not like this’. The Ninth Doctor used the same phrase when speculating if he would take Rose Tyler to Barcelona, before his regeneration in "Bad Wolf/The Parting of the Ways".
This story saw the unannounced final appearance of Ncuti Gatwa as the Fifteenth Doctor, leaving after just two seasons, sixteen stories and eighteen episodes. It also marked the departure of his companions - Millie Gibson, as Ruby Sunday, and Varada Sethu, as Belinda Chandra.
At the end of this story included the return of Jodie Whittaker as the Thirteenth Doctor for a brief multi-Doctor scene.
Another surprise return happened with The Doctor's regeneration, as he regenerated, seemingly, into a new incarnation played by Billie Piper – who previously played the part of travelling companion Rose Tyler.
Billie Piper though is not credited as any named role, with her credit being ‘and introducing Billie Piper’. Previously both Ncuti Gatwa and Jodie Whittaker were credited as ‘The Doctor’.
Like in "The Power of The Doctor", Billie Piper's introductory credit is shown after the other actors playing The Doctor and not at the end of the cast list.
The Doctor regenerates in the light of Joy Almondo’s star (see "Joy to the World").
Following this story's broadcast, various pieces of evidence came to light which suggested that its conclusion - including the surprise departure of Ncuti Gatwa - was the result of last minute reshoots, that were put out in place of an alternate ending which would have not only secured the continuation of the Fifteenth Doctor's tenure, but set up plot threads for the proposed following season.
This story contains an error in the clip that was intended to be of the First Doctor. It was actually taken from the coloured version of "The Daleks" which was not of the First Doctor, but that of the Abbot of Amboise (who appeared in the 1966 story "The Massacre of St. Bartholomew's Eve").
It was announced prior to broadcast that, unlike the previous stories in this season, the final episode of this two-part story would premiere simultaneously on BBC One, iPlayer and Disney+, as well as in select cinemas in the UK and Ireland. The reason for the scrapping of the early iPlayer release, that fans had come to expect from recent stories, was to allow viewers to experience the climactic end to this season at the same time.
When Doctor Who became a co-production between the BBC and Disney+, a new release strategy was implemented in which stories were released first on Saturday mornings on the BBC iPlayer - prior to their television broadcast that evening. This though stirred up controversy among fans, who feared that pivotal moments would be spoiled online before some people could have a chance to tune in, detracting from the community element of the experience.
Despite Russell T Davies defending this strategy, when it was first announced, this was relented for "The Reality War" meaning that fans reached the end of this season together. In a statement, Russell T Davies teased: ‘The Doctor is doomed, Belinda is lost, Ruby is trapped, UNIT is powerless, the Unholy Trinity rule supreme and the Underverse is rising. And now we can all experience this devastating climax together, all at the same time, with a unique worldwide premiere. I can promise shocks, scares and revelations off the scale. Come and have fun!’
The cinema screening for "The Reality War" included: an advert for various programmes on BBC iPlayer, including Doctor Who, an advert for the Whoniverse on BBC iPlayer (showing footage from all major eras of the show), a trailer for The War Between the Land and the Sea and a special introduction presented by Varada Sethu, who introduced herself as normally playing Belinda Chandra, but saying that in the "Wish World" she was Belinda Smith. She recapped the ending of "Wish World" before telling audiences to enjoy "The Reality War". She also stated that the episode's feature length was 68 minutes long. The UK version of "The Reality War" was actually 66 minutes and 40 seconds long.
The BBC promised that "The Reality War" would represent one of The Doctor's 'most terrifying and monumental battles to date', although very little was revealed before broadcast about the precise nature of the threat that he would face. There were however, plenty of theories flying around, with some fans anticipating a major reveal in the vein of Season Forty One (New Series 14)'s Sutekh moment or at the very least some kind of payoff to the perplexing scheming of Mrs Flood.
This was the first time that The Doctor's regeneration was not announced prior to broadcast.
A promotional image for this story showed The Doctor and Belinda partying at a club. This scene though did not appear in this story.
This story was the last story to be produced and broadcast under partnership with Disney+, with the conclusion of this partnership being officially announced five months later. A Christmas special was due to be made and aired for the end of 2026. But this was subsequently cancelled in an announcement on the 10th June 2026.
Carole Ann Ford appeared as Susan in the previous story "The Interstellar Song Contest" and the first episode of this story, but was not in the second part "The Reality War". Carole Ann Ford was in the Doctor Who: Unleashed episode for "The Interstellar Song Contest" wearing a grey costume which did not appear in either of these two stories. Scooper Daniel Richtman stated that ‘Susan would have appeared in a "Five Doctors"-esque look (grey trenchcoat) overlooking the party that The Doctor are at’, in what he said was the original ending for this story. ‘She would have been standing with Poppy to... Susan says, 'Let’s go Mum', before cutting to the end credits. This was to be explored during the following season but this was shelved once the next season did not go ahead as planned, and Russell T Davies wanted to give the Poppy storyline an ending instead of having to pick it up in a later season with a new Doctor’.
On the 16th April 2024, Ncuti Gatwa said in an interview with Entertainment Weekly that he would be ‘so angry’ if he never got to face a Dalek, following hearing talk about him never facing one, adding ‘What on earth would be the point of me being Doctor Who without facing a Dalek!’.
On the 11th October 2024, Ncuti Gatwa appeared on The Graham Norton Show and said, ‘It is all going well. We did the second series this year, the Christmas special is coming up, and we are filming a third series next year’. However, according to Deadline's understanding, this quote was cut from the broadcast edit to ‘liven up’ Ncuti Gatwa's interview, and the BBC reiterated in a statement that no decision on the future of Doctor Who would be made until after the release of this season.
On the 12th October 2025, at an event hosted by The Sirens of Audio at the Parramatta Club in Sydney for the Doctor Who Club of Australia, it has been revealed that Katy Manning asked Carole Ann Ford: ‘Did you know who your mummy was?’ in relation to Susan's origins - where Carole Ann Ford answered: ‘You didn’t see the episode which was to sort of introduce my coming back, where I was holding hands with a little - beautiful little tiny black child, three years old. And we were watching through the window somewhere where the audience wasn’t supposed to know where we supposed to be. And we were watching by newly-embodied grandfather, who was now Ncuti, and watching him have a wonderful time singing and dancing in a party in a shop opposite where we were. And obviously I, my character Susan, was longing to just go there and fling her arms around her grandfather and say, “Grandfather, how lovely to see you after all this time and how did you survive your floating about in space... and why have you changed?”’. Carole Ann Ford also said, ‘Anyway, that was unfortunately not to be - for reasons I know and will not disclose’.
On RadioTimes.com part of an interview with Bonnie Langford and Carole Ann Ford on 1st November 2025 was published. Bonnie Langford said that she ‘didn't have a scooby’ about Billie Piper's part, and that the end of this story ‘was quite different to how we had filmed it. We'd filmed it the year before, and I had to pop back and do some extra filming, which I couldn't do with everybody else, which I was really disappointed about - I was in America at the time’. Carole Ann Ford said, ‘I think enough people out there know by now that something extra was filmed and wasn't shown... So yes, of course there were a couple more scenes which, because of some changes that had to be made, didn't make sense once the changes have been made. So they obviously had to film something else that went with those changes... Shame though - I'd love to have done it, and the bit I did do, I really enjoy doing, and I love seeing it. I sort of looked as if I was floating in space. And you've still got to find me, grandfather! I'm waiting for that!’.
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The Firsts:
The first Doctor Who story to be directed by Avril Evans.
The first appearance of Jodie Whittaker, as the Thirteenth Doctor, since the 2022 story "The Power of The Doctor".
The first appearance of Billie Piper since the 2013 story "The Day of The Doctor".
The first appearance of Bonnie Langford, as Melanie Bush, since the 2024 story "The Legend of Ruby Sunday/Empire of Death".
The first appearance of Omega since the 1983 Fifth Doctor story "Arc of Infinity".
The first-time archive audio from Big Finish Productions has been used in a televised Doctor Who story.
The first time that The Doctor's regeneration was not announced prior to broadcast.
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The Lasts (Subject to Future Stories):
The last story of Season Forty Two (New Series 15).
Ncuti Gatwa's last story as the Fifteenth Doctor.
Varada Sethu's last appearance as companion Belinda Chandra.
The last Doctor Who story to be produced and broadcast under partnership with Disney+.
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