The Legend of Ruby Sunday

"The Legend of Ruby Sunday" is the seventh and penultimate episode of the fourteenth series of the British science fiction television series Doctor Who. It was simultaneously released on Disney+ in the United States on 14 June 2024 and on BBC iPlayer in the United Kingdom on 15 June. A BBC One broadcast followed later in the day. The episode is the first in a two-part story written by Russell T Davies and directed by Jamie Donoughue. The story was concluded with "Empire of Death", which was broadcast the following week on 22 June. The entire two-part story was also given a limited theatrical release.

In the episode, the Fifteenth Doctor (Ncuti Gatwa) and his companion, Ruby Sunday (Millie Gibson), seek UNIT's help in determining the identity of the mysterious woman who has appeared in many of their adventures, as well as the identity of Ruby's mother. The episode also reintroduces the villain Sutekh, following his only previous television appearance in the 1975 serial Pyramids of Mars. It was filmed in July 2023 along with the following episode.

Plot
The Doctor arrives at UNIT Headquarters, meeting up with their leader Kate Lethbridge-Stewart and several other members of UNIT. The Doctor asks them to try and identify the mysterious woman who has appeared as various other faces in his previous adventures. UNIT is able to identify her as Susan Triad, who is the head of S Triad Technology. The group believe S Triad to be an anagram of TARDIS, and believe it to be a trap. The Doctor additionally believes that Triad may be his granddaughter Susan Foreman. Ruby leaves with Rose Noble in order to retrieve a VHS containing security footage from the night Ruby was abandoned, with the Doctor and Ruby hoping to identify Ruby's mother through the usage of UNIT's technology.

Ruby and Rose return to Ruby's apartment, where Ruby's mother Carla joins them; they have their neighbour Mrs Flood look after Carla’s mother, Cherry. After they leave, Mrs Flood suddenly treats Cherry with contempt and observes an incoming storm, stating "he waits no more". Ruby and Rose return to UNIT headquarters, where they use a "Time Window" in order to recreate the night Ruby was abandoned, entering it alongside UNIT colonel Chidozie. A hooded figure, believed to be Ruby's mother, points at the Doctor, who asks Chidozie to see if there was anything else the figure could have been pointing at. Chidozie sees nothing, and as the figure disappears, a mysterious swirling vortex appears where Chidozie stood. After asking him questions, the Window overloads, leaving behind Chidozie's dead body.

The Doctor goes with Mel to talk to Triad as she prepares for an international technology launch broadcast. The Doctor does not recognise Triad as his granddaughter, and realises that she experiences dreams of her other existences. UNIT view the vortex on the VHS and, using image enhancing technology, are able to determine that the TARDIS was at the centre of the vortex. UNIT identifies a being surrounding the TARDIS as it begins to groan. Harriet Arbinger, a member of UNIT, is revealed to be a harbinger of The One Who Waits, who materialises around the TARDIS and reveals himself as Sutekh, the god of death. Triad breaks down over the memories of her dreams during the broadcast, before Sutekh possesses her and attempts to kill the Doctor.

Development
The episode was written by Doctor Who showrunner Russell T Davies. Davies said he first got a rough idea for the episode 40 to 50 years earlier. Davies gave a list of five previous stories that he suggested viewers watch before the episode released. The episode draws together many loose threads and story arcs that appeared throughout the series. Some of these storylines also continued to explore that surrounding the Timeless Child, which previous showrunner Chris Chibnall introduced during his era. Davies originally intended the episode to begin with a cold open at an American coffee bar in 1947. The episode had a working title of "Chrysalis".

The story re-introduces Sutekh to Doctor Who after his only previous televised appearance in the 1975 serial Pyramids of Mars, where he battled against the Fourth Doctor (Tom Baker). Sutekh is based on the Egyptian deity Set, which accords with Davies's goal of bringing more gods to the programme. He was also revealed to be "the one who waits", mentioned to the Doctor by the Toymaker in "The Giggle" (2023), and the leader of the Gods of Chaos, other members of which were encountered in "The Giggle" and "The Devil's Chord" (2024). It is the first episode in a two-part story, concluding in the following week's episode, "Empire of Death". The two episodes were bridged by an episode of Tales of the TARDIS, presenting Pyramids of Mars with updated special effects.

Filming
"The Legend of Ruby Sunday" was directed by Jamie Donoughue, who compared the two-part finale to a feature film. It was produced in the series's fifth production block, along with the following episode, in June and July 2023. To create the scene of the TARDIS crashing into the UNIT headquarters, a tennis ball was rolled down the aisle on the set to allow for interaction with the performers. The TARDIS was later added using visual effects.

Hoping to create a more realistic look in the time window scene, the production team opted not to use a green screen. Instead, a team returned to St Mary's Church in Nash, Newport, which was previously used as a location in "The Church on Ruby Road" (2023). Once there, they used lidar or photogrammetry scanning to create a three-dimensional model of the church. After applying effects to the model in Unreal Engine, it was projected onto the wall and camera tracked.

Millennium FX designed the mask for Twist's character with the goal of accentuating her bone structure but without suggesting the appearance of a zombie. Codenames were used while filming in public to keep the episodes' antagonists a secret. Some filming for the story occurred at One Central Square in Cardiff in June 2023.

Casting
Numerous performers reprised their roles after appearing earlier in the fourteenth series and throughout the 2023 specials. Jemma Redgrave reprised her role as Kate Lethbridge-Stewart, while Bonnie Langford guest-starred as former Sixth and Seventh Doctor companion Mel Bush. Langford had returned to Doctor Who in "The Giggle" (2023) after a 36-year absence. Langford described her role in the episode as "camp as hell". Additionally, Yasmin Finney returned as Rose Noble, the daughter of former companion Donna Noble, following her introduction in "The Star Beast" (2023).

Susan Twist made an appearance as Susan Triad, the head and founder of the fictional company S Triad Technology. Twist first appeared in "Wild Blue Yonder" and made a further appearance in "The Church on Ruby Road" before appearing in every episode of the fourteenth series as seemingly disparate characters. These roles were ultimately connected in the episode, with "S Triad" an anagram for "TARDIS" and "S Triad Technology" (as in Susan Triad Technology) was abbreviated to "Sue Tech", which is a homophone of "Sutekh". References to "Triad Technology" had been planted in Doctor Who as early as "The Giggle", where the company was mentioned in dialogue, as well as "The Church on Ruby Road", where a fictional advertisement appeared on a bus. Davies originally had three additional roles planned for Twist that would have featured in the episodes cold open. These included a nanny pushing a stroller in 1946 Pennsylvania, a blue-skinned extraterrestrial working in an alien diner as a waitress who would have served the Doctor and Ruby, and a "human astronaut addressing a colony of giant ants". The scene in Pennsylvania would have also featured inventor Albert Einstein and activist Paul Robeson.

Nicholas Briggs voices the Vlinx. Other returning cast members include Alexander Devrient, Michelle Greenidge, Anita Dobson, Angela Wynter, and Aidan Cook. Lenny Rush appeared in the episode as Morris Gibbons, a scientific advisor for UNIT. Rush was originally cast to voice the character Eric in the series opening episode, "Space Babies". However, the producers were impressed with his performance during the read-through and early days on set that they chose to recast him as Gibbons instead. Gabriel Woolf, at the age of 91, additionally appears as the voice of Sutekh, reprising his role from Pyramids of Mars. The remainder of the guest cast included Genesis Lynea, Fela Lufadeju, Tachia Newall, and Jasmine Bayes.

Broadcast
"The Legend of Ruby Sunday" was released on BBC iPlayer in the United Kingdom on 15 June 2024 and followed by a broadcast on BBC One later in the day. Disney also handled international distribution of the episode outside of the United Kingdom and Ireland, with it being released on Disney+ worldwide, simultaneously with the iPlayer release.

The episode was shown the following week in select cinemas in the United Kingdom alongside the series finale "Empire of Death".

Ratings
The episode brought in overnight viewing figures of 2.02 million viewers, slightly lower than that of the previous episode, "Rogue". The episode holds the lowest viewing figures of the fourteenth series.

Critical reception
Robert Anderson of IGN responded positively to the episode, praising the performance of Langford as Mel as well as the episode's tone, its presentation, and several of its scenes. He criticized the episode's cramped narrative and lack of character work between Ruby and the Doctor. Rebecca Cook of Digital Spy felt that the fantasy aspects of the episode worked well towards its narrative, believing that having Sutekh take the TARDIS allowed for the episode to become more menacing than it would have been otherwise. David Opie of GamesRadar+ praised the Time Window sequence and Langford's and Gatwa's performances together, though he felt the character of Ruby was underused in the episode.

Martin Belam of The Guardian felt that while the episode showed Gatwa's strengths as the Doctor, he felt the episode lacked many chilling moments along the way because of how the episode spent most of its time building to the climax. Stefan Mohamed of Den of Geek had a mixed response to the episode; while he believed the setup would be confusing to those unfamiliar with the show or uninvested in the characters, he felt the episode and plot "just about works" because of strong acting performances and major moments in the episode.