Slow Horses returns to Apple TV on September 16, 2026 with a sixth season of six episodes. The first installment will drop at launch, followed by new episodes every Wednesday through October 21, 2026. Gary Oldman reprises his role as Jackson Lamb alongside Jack Lowden and Kristin Scott Thomas.
The British espionage series follows the agents at Slough House, a unit of MI5 where intelligence officers whose mistakes have jeopardized their careers are reassigned. Led by Jackson Lamb, as seasoned as he is irascible, this marginalized team routinely finds itself at the center of cases that go beyond the scope of the missions it’s meant to handle.
In season 6, the operatives at Slough House find themselves on the run. Diana Taverner, played by Kristin Scott Thomas, pulls them into a cycle of retaliation and vengeance with potentially lethal consequences. This new plot flips their usual role: rather than investigating from the margins of MI5, they must now elude a system that is targeting them head-on.
The season adapts Joe Country and Slough House, the sixth and seventh novels in Mick Herron's literary series. The television adaptation is helmed by Gaby Chiappe, while Adam Randall returns to directing after previously working on the show.
The ensemble features Gary Oldman, Kristin Scott Thomas, Jack Lowden, Saskia Reeves, Christopher Chung, Aimee-Ffion Edwards, Rosalind Eleazar, Joanna Scanlan, Samuel West, Ruth Bradley, Tom Brooke, Jonathan Pryce, and Hugo Weaving. Lenny Rush also joins the series for this new season.
Season 6 primarily signals the return of Olivia Cooke in the role of Sidonie "Sid" Baker. Having appeared since the first season, the agent had vanished from Slough House after being badly injured. The first footage shows her alongside River Cartwright, with the exact circumstances of her return still unclear.
Launched in 2022, Slow Horses has steadily brought to screen the novels centered on MI5’s disgraced agents. Season 5, drawn from London Rules, wrapped up in October 2025. It earned nine Emmy nominations, including for Outstanding Drama Series, Outstanding Lead Actor for Gary Oldman, and Outstanding Supporting Actor for Jack Lowden.
The series is set to continue beyond these new episodes: a seventh season has already been ordered by Apple TV+. It will be adapted from Bad Actors, the eighth novel in Mick Herron’s series, but no air date has been announced yet.
To go further, also take a look at our picks for September’s Apple TV+ releases, our guide to streaming titles across all platforms, and today’s streaming pick: What to watch today on streaming.
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