Capaldi Joins London Mystery
Peter Capaldi Joins Only Murders in the Building Season 6, Expanding Doctor Who Reunion in London
Key Points
Season 6 marks Only Murders in the Building's first-ever move outside the United States, with production underway in London (the UK) as of May 2026.
The London-based ensemble features a broad guest list beyond the Doctor Who alumni, including Derek Jacobi, Jane Horrocks, Richard Ayoade, Lesley Nicol, Anjana Vasan, Jamie Demetriou, Martin Freeman, and Geri Halliwell-Horner, among others.
Rumored Season 6 victim is Cinda Canning, the podcaster played by Tina Fey, signaling a high-profile twist for the London mystery.
Peter Capaldi is joining as a recurring guest star, continuing the Doctor Who reunion with Tennant and Whittaker; Capaldi is the actor who portrayed the Twelfth Doctor, and he has also been noted for roles such as Malcolm Tucker in The Thick of It.
Only Murders in the Building Season 6 has confirmed a third Doctor Who star for its cast. Peter Capaldi, who played the Twelfth Doctor, is joining as a recurring guest star, according to Digital Spy. He joins fellow Time Lords David Tennant and Jodie Whittaker in what is shaping up to be a major Doctor Who reunion on screen.
The show is leaving New York behind for the first time in its history. Season 6 is filming in London, with Steve Martin, Martin Short, and Selena Gomez continuing as the leads, per Comic Book. Ten new episodes are in production for Hulu and Disney+.
Three Doctors Now Confirmed for the London Season
Peter Capaldi is the third former Doctor Who lead to sign on for Season 6, Yahoo Entertainment reported. Tennant played the Tenth Doctor. Whittaker played the Thirteenth. Capaldi's Twelfth Doctor ran from 2013 to 2017. All three are now recurring guest stars on the same show at the same time.
Jim Broadbent is also part of the cast. He played an alternate version of the Eleventh Doctor in a 2013 Doctor Who special, adding a fourth link to the BBC sci-fi series, according to Head Topics. The Doctor Who connection appears to be a deliberate creative choice for the London setting.
A Star-Packed British Ensemble Assembled for London
The guest cast goes far beyond the Doctor Who alumni. The show has added Olivia Colman, Martin Freeman, Nicola Coughlan, Simone Ashley, Jennifer Saunders, Richard Ayoade, Derek Jacobi, Jane Horrocks, Lesley Nicol, Anjana Vasan, Jamie Demetriou, and Geri Halliwell-Horner, per Comic Book.
Capaldi is well known beyond Doctor Who. He played the sharp-tongued spin doctor Malcolm Tucker in The Thick of It, a beloved British political comedy. That role made him a household name in the UK long before he stepped into the TARDIS, Digital Spy noted.
Tina Fey's Character May Be the Season's Murder Victim
Season 6 may have a high-profile victim at its center. Reports suggest the season's murder target is Cinda Canning, the true-crime podcaster played by Tina Fey. Fey has been a recurring presence in the show and her character's death would mark one of the biggest twists yet.
The core trio — Martin, Short, and Gomez — will travel to London to solve the case. Their Arconia-based podcast operation goes international for the first time. Production is underway in 2026, with the show set to return to Hulu and Disney+ later this year, according to Yahoo Entertainment.
Season 6 Marks the Show's First Shoot Outside the US
London is not just a backdrop. It is a full creative shift. Only Murders in the Building built its identity around New York's Arconia apartment building. Moving to London for an entire season is the biggest structural change the show has ever made, Digital Spy reported.
The show is produced by 20th Television. It has been one of Hulu's most consistent hits since its 2021 debut. With five seasons already aired and an Emmy-winning track record, Season 6's London gamble comes from a position of strength. Filming is in progress as of May 2026.
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