Black Mirror went on hiatus after its fifth series was released in 2019. Its executive producers,
Charlie Brooker and
Annabel Jones, departed from the production company House of Tomorrow and joined Broke and Bones, leading to negotiations for production rights. During this time, Brooker took a break from
Black Mirror and worked on projects that were more comedic. In May 2022,
Netflix announced that a sixth
Black Mirror series was in development. Broke and Bones produced the series, while House of Tomorrow's parent company,
Banijay, retained ownership. "Demon 79" is the last of the five episodes in series six, though it was the first to be written. The series was released on 15 June 2023. The episode was written by Brooker and
Bisha K. Ali. Ali is the only co-writer of the sixth series; she created the series
Ms. Marvel (2022). Ali also received a credit as executive producer of the series six episode "
Joan Is Awful". Brooker noted that, since
Black Mirrors 2011 debut, dystopian sci-fi with technological themes had gone from rare to common, so he aimed to write horror fiction and
period dramas. He conceived of "Demon 79" as the first episode of a companion retro-themed horror anthology series called
Red Mirror. Inspired by "Demon 79", other episodes in the series are set in the past: "
Beyond the Sea" was changed from a near-future story to one in 1969 and "
Mazey Day" is set in the mid-2000s. with additional cast members Katherine Rose Morley and
David Shields revealed in May 2023. Nicholas Burns, who plays Keith Holligan, starred in
Nathan Barley (2005), which was co-created by Charlie Brooker. Vasan is one of the few actors to appear in multiple
Black Mirror episodes; she had a small role in "
Nosedive", wearing silver paint and credited as "Space Cop" and made a cameo as a gamer in series 7 episode "
USS Callister: Into Infinity". Her other roles include Amina in
We Are Lady Parts (2021–) and Stella in
A Streetcar Named Desire, characters that are underestimated, like Nida. "Demon 79" was the second episode directed by
Toby Haynes, after "
USS Callister". Brooker said it was made as "a lost corner of the late 70s that's shot through with a sort of modern sensibility". The local newspaper
Harrow Online reported that it was filmed in
Harrow, London, in June 2022, under the code name "Project Red Book". Exterior shots of Possetts were sighted in
Greenhill, Harrow. Udo Kramer designed sets for all series six episodes. Kramer said that much research was done on 1970s department stores; the furniture and fixtures were made specifically for the episode and the colour palette was chosen to match the period. NVIZ Studio worked on the news reports that show Smart's rise to fascist leader, with iterations of Britannia Party messaging over three decades. Additional black-and-white photography was taken by
David Hurn. The soundtrack was composed by
Christopher Willis and released on 21 July 2023. Ali and Vasan, both immigrants, spoke about the racial themes of the episode during the production process. Vasan could relate to Nida as an Indian-born woman who moved to Singapore in childhood and Britain in adulthood. Vasan's first question to the writers was over Nida's comment "people said my mum was mad". This is left unexplained, so Vasan speculated that Nida's mother may have been "loud and eccentric" and, unlike Nida, not tried to
assimilate to England. This contrasts with the interpretation that Nida's mother had mental health issues and Nida imagined Gaap. Vasan thought that Nida herself questions whether she is "just going insane". Essiedu saw the political themes of "Demon 79" as having contemporary relevance, as the episode features an active political party and "the same kind of campaign slogans" as modern politicians. Vasan drew parallels to modern politicians using the anti-immigration slogan "stop the boats". Essiedu saw the ending as "quite hopeful", choosing to show Nida and Gaap leaving Earth rather than the reality of spending forever together. According to the production, the decision to have Gaap teleport wherever Nida looks when she is trying to run away was made on the day of filming, with Essiedu crouching and running to minimise the "camera trickery". Haynes discussed with Vasan what it would feel like to Nida when Gaap shows a horrifying vision—like a panic attack or the inability to breathe—and Vasan experimented with her reactions on set. == Analysis ==