Anyone who’s binged through the twisted world of Slough House knows Slow Horses delivers that rare mix of biting humor, brutal action, and characters you can’t help rooting for despite their flaws. Gary Oldman’s Jackson Lamb – greasy, rude, and secretly brilliant – anchors the whole thing. Season 5 just wrapped with major shake-ups at MI5, and that teaser at the end left jaws on the floor. The misfits are back in deeper trouble than ever.
Release Date Speculation for Slow Horses Season 6
No exact date locked in yet, but the track record screams fall 2026. Seasons 4 and 5 both hit in September (2024 and 2025), and filming for season 6 finished way back earlier this year. Post-production’s had plenty of time to polish things up.
That quick teaser rolled right after the season 5 finale, keeping the hype alive. Gary Oldman and others have pointed to another autumn drop, likely September or October 2026. Apple sticks to yearly releases for this one, so nothing suggests a delay.
Slow Horses Season 6 Expected Cast
The Slough House gang stays mostly together, with that messy dynamic everyone loves:
- Gary Oldman back as the disgusting-yet-sharp Jackson Lamb
- Jack Lowden as River Cartwright
- Kristin Scott Thomas as the ambitious Diana Taverner
- Saskia Reeves playing Catherine Standish
- Rosalind Eleazar as Louisa Guy
- Christopher Chung as tech whiz Roddy Ho
- Aimee-Ffion Edwards as Shirley Dander
- Tom Brooke as J.K. Coe
- Ruth Bradley likely continuing as Emma Flyte
Hugo Weaving returns as Frank Harkness – spotted in the teaser causing chaos again. Jonathan Pryce and Joanna Scanlan should pop up too. New faces join the hunt, ramping up the danger.
Slow Horses Season 6 Potential Plot
This season pulls from Mick Herron’s Joe Country and Slough House – first time combining two books. Apple’s logline hits hard: the Slow Horses go on the run while Diana Taverner drags them into a deadly game of retaliation and revenge.
After season 5’s power shifts, Taverner’s in charge, but the teaser shows a stolen file with all their names, turning the team into targets. Expect personal hits, betrayals, chases, and Lamb’s savage one-liners amid the darkness. Revenge threads weave through loss and survival, staying loyal to Herron’s style.
