The gritty spy thriller Slow Horses keeps delivering sharp twists, dark humor, and unforgettable performances, and fans are already buzzing about what’s next. With Season 5 wrapping up in late 2025, excitement builds for the upcoming sixth season on Apple TV+. Here’s the current scoop on release timing, returning stars, and hints about the story ahead.
Slow Horses Season 6 Release Date Speculations
Apple hasn’t dropped an exact premiere day yet. Most solid reports point to fall 2026, probably September or October, keeping the recent yearly rhythm going strong. Season 4 hit in fall 2024, Season 5 followed in fall 2025 — the pattern holds.
Some fans on Reddit swear it could land earlier, maybe May or June 2026, since Seasons 5 and 6 shot back-to-back and wrapped filming way back in early-to-mid 2025 (some say as early as February, others summer). Post-production takes time though, and Apple likes aligning drops with awards buzz, so autumn feels more likely than a sudden spring surprise.
Trailer-wise, expect something to surface in the next couple months — early 2026 footage has been the rumor for a while. Keep an eye on Apple TV+ announcements; they tend to build hype a few months out.
Bonus: Season 7 is already filming (kicked off late 2025), so the show is locked in for the long haul.
Slow Horses Season 6 Expected Cast
Gary Oldman is obviously returning as the legendary Jackson Lamb — disheveled, brilliant, and still the best thing on TV. The main crew should all be there:
- Jack Lowden — River Cartwright, forever chasing redemption
- Kristin Scott Thomas — Diana Taverner, now running the show at First Desk
- Saskia Reeves — Catherine Standish
- Rosalind Eleazar — Louisa Guy
- Christopher Chung — Roddy Ho (still insufferable in the best way)
- Aimee-Ffion Edwards — Shirley Dander
Jonathan Pryce, Tom Brooke, and the rest of the ensemble will likely pop up too. There’s chatter about fresh faces tied to the leaked Slough House mess, but nothing confirmed beyond the core group. The chemistry is what makes the show, and it doesn’t look like anyone’s getting written out just yet.
One big shift: Head writer Will Smith left after Season 5. New team stepped in, but early signs suggest the tone — sharp, cynical, messy — hasn’t changed.
Slow Horses Season 6 Potential Plot
Season 6 pulls from Mick Herron’s Joe Country and Slough House. Official word from Apple says the Slow Horses end up on the run while Diana Taverner drags everyone into a deadly game of retaliation and revenge.
After Season 5’s power shifts — Taverner at the top, Slough House scrubbed from the records — old scores come due. Enemies circle, grudges resurface, and yeah, the stakes feel higher than ever. Some team members might not survive the fallout. Expect the usual mix: Lamb’s savage one-liners, botched ops, MI5 backstabbing, and those slow builds that suddenly go full chaos.
It’s still the same show that makes you root for the screw-ups over the slick suits.