Series 8 premiered on December 22, 2022, with a Christmas special, with the remaining five episodes airing from April 2023. Following series 9, the show is set to enter an indefinite hiatus. After the finale, the BBC announced that they had commissioned two further series of the show, bringing it to nine series. The sixth series aired in 2021, followed by a seventh series in 2022.

There was a one-off Halloween special live episode in October 2018, and the fifth series was shown in 2020. The fourth series followed in early 2018. Series three began with a Christmas special in December 2016, followed by five more episodes starting February 2017. The second series, again consisting of six episodes, was shown in 2015. The first series was shown in 2014 and featured six regular episodes, alongside a special online-only cinemagraph-based webisode. 9 from an episode of Psychoville, a previous project, which was filmed in a single room - this in turn was inspired by Alfred Hitchcock's Rope. Pemberton and Shearsmith took inspiration for Inside No. Themes and tone vary from episode to episode, but all have elements of comedy and horror or perverse humour, in addition to a plot twist. The stories are linked only by the number 9 in some way, typically taking the form of a door marked with the number 9, and a brass hare statue that is in the background of all episodes. 9 to attract a number of well-known actors. Aside from the writers, each episode has a new cast, allowing Inside No. Each 30-minute episode is a self-contained story with new characters and a new setting, and all star Pemberton or Shearsmith (usually both). It is written by Reece Shearsmith and Steve Pemberton and produced by the BBC. 9 is a British black comedy anthology television programme that first aired in 2014.

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