Slow Horses season six brings Sid back amid deadly threat
Developed over time first seen 2 months ago
Apple TV+ has released the trailer for Season 6 of "Slow Horses", confirming the surprise return of Olivia Cooke's character Sid, unseen since Season 1 in 2022, alongside a deadly new threat facing the Slough House team. Gary Oldman reprises his role as the acerbic spymaster Jackson Lamb, who leads his misfit agents into hiding after discovering that former Slough House staff are being systematically hunted down and killed, describing the unfolding carnage as "a blood bath." The season builds on the show's growing critical standing, arriving as Season 5 sits nominated for nine Emmy Awards, including best drama series.
The new season, directed by Adam Randall and adapted by Gaby Chiappe from Mick Herron's spy novels, premieres on 16 September on Apple TV+ and will release weekly instalments through to 21 October. Its plot centres on Kristin Scott Thomas's Diana Taverner drawing the team into a high-stakes game of retaliation and revenge, with the trailer showing Lamb confronting her directly about the deaths. Returning cast members include Jack Lowden, Saskia Reeves, Rosalind Eleazar and Joanna Scanlan, alongside Christopher Chung, Aimee-Ffion Edwards, Samuel West, Ruth Bradley, Jonathan Pryce and Hugo Weaving, with BAFTA winner Lenny Rush joining the ensemble for the first time. The series remains produced by See-Saw Films.
- "Slow Horses" Season 6 trailer confirms Olivia Cooke's Sid returns after Season 1
- Slough House alumni being hunted and killed; premieres 16 September, weekly to 21 October
- Season 5 has nine Emmy nominations, including best drama series
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Slow Horses is a spy drama on Apple TV+ based on Mick Herron's novels, following a team of disgraced MI5 agents exiled to a dead-end unit called Slough House for their past failures. It stars Gary Oldman as Jackson Lamb, the unit's foul-mouthed but sharp boss, alongside Kristin Scott Thomas as senior MI5 figure Diana Taverner and Jack Lowden as agent River Cartwright. The show has built a strong reputation over its previous seasons, and its most recent run picked up nine Emmy nominations, including best drama series.
The sixth season centres on former Slough House staff being hunted down and killed, forcing Lamb and his team into hiding while trying to work out who is behind the killings. It also marks the return of Olivia Cooke's character Sid, who has not appeared since the first season in 2022, adding a mystery for long-time viewers around how and why she is back. Other returning cast members include Saskia Reeves, Rosalind Eleazar and Joanna Scanlan, alongside newcomer Lenny Rush.
This matters to fans because it signals the next chapter of one of Apple TV+'s most acclaimed original series, continuing its adaptation of Herron's book series. The season is set to premiere on 16 September, with new episodes released weekly through to 21 October.
More coverage
- The Hollywood Reporter — A Ghost From the Past Returns in New ‘Slow Horses’ Season 6 Trailer
- Deadline — Jackson Lamb’s Team Hunted Like Prey In ‘Slow Horses’ Season 6 Trailer; Olivia Cooke Returns
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Originally published by Variety as “‘Slow Horses’ Season 6 Trailer: Olivia Cooke’s Sid Makes a Surprise Return as Gary Oldman Warns Slough House Gang to Go on the Run”.