Gary Oldman returns in Slow Horses season 6 on September 16, 2026, and Apple TV+ is spacing the run across six weekly episodes. That gives the series a longer runway than a one-night drop, with the finale set for October 21, 2026.
The season’s six-episode rollout keeps the show visible for more than a month, which is the kind of release pattern streaming services use when they want a title to stay in the weekly conversation. Oldman reprises Jackson Lamb, and Lenny Rush joins the cast for a season that keeps the core ensemble in play.
Oldman and Jackson Lamb return
Gary Oldman’s return as Jackson Lamb is the anchor here, because the show still depends on that central performance to carry the odd-couple rhythm of the Slough House setup. Jack Lowden, Kristin Scott Thomas, Saskia Reeves, Aimee-Ffion Edwards, Christopher Chung, and Joanna Scanlan are part of the returning cast around him.
Lenny Rush joins for Season 6, but the role is not disclosed. That keeps the casting news useful without pretending the production has already revealed how he fits into the story.
Mick Herron source material
Mick Herron’s Joe Country and Slough House feed the new season, and the adaptation pulls from the sixth and seventh novels in the Slough House series. That source range gives Apple TV+ room to widen the season’s conflict without having to treat the rollout like a standalone detour.
The official logline says, “Season 6 sees the Slow Horses on the run as Diana Taverner embroils them all in a fatally high-stakes game of retaliation and revenge.” That places Diana Taverner back at the center of the pressure, with Jackson Lamb and the group pushed into motion rather than left to sit inside Slough House.
Season 7 and Season 8
Apple TV+ has renewed Slow Horses for Season 7, and reports suggest that Season 8 is also in development. At the same time, Season 7 has reportedly completed production, which means the franchise already has more runway than the September 16 launch alone might suggest.
For viewers of Slow Horses and the returning cast, the practical takeaway is simple: the next stretch starts on September 16, runs for six weekly episodes, and ends on October 21, 2026. What role Lenny Rush will play in Slow Horses Season 6 is still the detail worth watching when the first episode lands.
