Slow Horses returns to Apple TV on September 16, 2026 with a six-episode sixth season. The first episode will be available at launch, followed by one new episode every Wednesday until October 21. 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, the MI5 unit where those whose mistakes have derailed their careers are relegated. This sidelined team, led by the seasoned yet irascible Jackson Lamb, often finds itself tangled in cases that go beyond the assignments they're given.
In season 6, the Slough House agents themselves become fugitives. Diana Taverner, played by Kristin Scott Thomas, drags them into a game of retaliation and revenge with potentially deadly consequences. The season adapts Joe Country and Slough House, the sixth and seventh novels by Mick Herron; Gaby Chiappe handles the adaptation and Adam Randall returns to directing.
The season 6 trailer:
The cast also features Saskia Reeves, Christopher Chung, Aimee-Ffion Edwards, Rosalind Eleazar, Joanna Scanlan, Samuel West, Ruth Bradley, Tom Brooke, Jonathan Pryce and Hugo Weaving. Lenny Rush joins the series for these new episodes.
Olivia Cooke returns prominently in the role of Sidonie “Sid” Baker. A familiar face since the first season, the agent had disappeared from Slough House after a serious injury. The first footage shows her with River Cartwright, with the exact circumstances of her return not yet revealed.
Launched in 2022, the series has gradually adapted Mick Herron’s novels. Season 5, inspired by London Rules, wrapped up in October 2025 and earned nine Emmy nominations for 2026. Saul Metzstein won the award for best dramatic directing for his episode “Scars,” a distinction tied to this season 5. Apple TV has already ordered a saison 7, adapted from Bad Actors, with no date announced.
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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