Slough House Spy Thriller Returns
Apple TV+ Announces Slow Horses Season 6 Premiere and New Showrunner Gaby Chiappe
Key Points
Apple’s new showrunner for Season 6, Gaby Chiappe, is also described as the creator of *The Beast Must Die*—a prior credit not mentioned in the summary.
Apple says Season 6 is produced for Apple TV by See-Saw Films, with multiple executive producers listed, including Jamie Laurenson, Hakan Kousetta, Julian Stevens, Iain Canning, Emile Sherman, Adam Randall, Gail Mutrux, Douglas Urbanski, and Gary Oldman.
The new season is based specifically on Mick Herron’s sixth and seventh novels—*Joe Country* and *Slough House* (not just generally “including” them).
Beyond the brief cast mention in the summary, Variety and others provide character-to-actor mappings for major returning roles (e.g., Jack Lowden as River Cartwright, Saskia Reeves as Catherine Standish, Aimee-Ffion Edwards as Shirley Dander, Rosalind Eleazar as Louisa Guy, Tom Brooke as J.K. Coe, Jonathan Pryce as David Cartwright, and Hugo Weaving as Frank Harkness).
9to5Mac highlights that the first-look promotion features Gary Oldman “in his iconic form as Jackson Lamb,” alongside the release-date announcement.
Apple TV+ has set September 16, 2026 as the premiere date for the sixth season of *Slow Horses*, its Emmy and BAFTA-winning spy drama. The six-episode run will conclude on October 21, with new episodes dropping every Wednesday. Broadway World confirmed the date alongside a first-look image release on June 11, 2026.
Gary Oldman returns as the shambling, brilliant Jackson Lamb, joined by a full ensemble of disgraced MI5 agents at Slough House. BAFTA winner Lenny Rush joins the cast in a closely guarded new role. Apple has already commissioned a seventh season, making *Slow Horses* one of the most secure franchises in streaming, according to Geektown.
Diana Taverner Unleashes a Lethal Game of Revenge
Season 6 follows the Slow Horses as they are pulled into a dangerous plot by Diana Taverner, played by Kristin Scott Thomas. Apple describes it as a "lethal game of retaliation and revenge" that forces the team to go on the run. The stakes are higher than any previous season, according to US Head Topics.
The season adapts two of Mick Herron's novels back-to-back: *Joe Country*, the sixth book, and *Slough House*, the seventh. This breaks the show's tradition of adapting one book per season. Geektown notes the six-book is set partly in Wales, while the seventh centers on a targeted campaign against the Slough House team in London.
Full Ensemble Returns, With One Notable New Face
The core Slough House team is back in full. Jack Lowden plays River Cartwright. Saskia Reeves returns as Catherine Standish. Aimee-Ffion Edwards plays Shirley Dander. Rosalind Eleazar returns as Louisa Guy, and Tom Brooke is back as J.K. Coe. Jonathan Pryce reprises the role of David Cartwright, and Hugo Weaving returns as villain Frank Harkness, per UK Head Topics.
Newcomer Lenny Rush, who won a BAFTA for his work in *Am I Being Unreasonable?*, joins in a role described as adding "a new layer of unpredictability" to the team. His exact character has not been revealed. Metro featured Rush prominently in the first-look images released alongside the premiere announcement.
New Showrunner Takes Over After Five Award-Winning Seasons
Gaby Chiappe, creator of *The Beast Must Die*, steps in as the new showrunner for Season 6. She replaces Will Smith, who led the series through its first five seasons and multiple major awards. Director Adam Randall, who helmed Season 4, returns to direct all six episodes of the new season, according to Broadway World.
Actor Christopher Chung, who plays Roddy Ho, said in a May 2026 interview that Season 6 has a "slightly different flavor" under Chiappe, but confirmed the show's signature dark humor is still intact. The season is produced by See-Saw Films, with Gary Oldman among the executive producers listed by Apple.
Season 7 Already in Production, Season 8 in Development
Apple has wasted no time securing the future of the franchise. Season 7 was greenlit in July 2025, before Season 5 even premiered in September of that year. Season 7 is already in production as of June 2026 and will adapt the novel *Bad Actors*, which centers on a mole inside the British government, according to Geektown.
Trade outlets report that Season 8 is already in active development at See-Saw Films. All five previous seasons of *Slow Horses* hold Certified Fresh status on Rotten Tomatoes, with Seasons 3 and 4 each scoring 100% from critics. The series earned nine Emmy nominations for Season 3 alone, including a win for Outstanding Writing, per US Head Topics.
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