The Slow Horses are leaving the barn again. Apple TV’s Emmy- and BAFTA-winning spy comedy-drama returns for season six on Wednesday, September 16, 2026 — one episode that night, then weekly through October 21. Adapted from Mick Herron’s Joe Country and Slough House, the six-episode run keeps Gary Oldman’s Jackson Lamb in the filthy driver’s seat of MI5’s dumping ground.
Kristin Scott Thomas returns as Diana Taverner, Jack Lowden as River Cartwright, and the usual Slough House misfits clock back in for another round of dry British chaos. The reunion fans have waited for: Olivia Cooke reprises Sidonie “Sid” Baker. Lenny Rush joins the ensemble, while Jonathan Pryce and Hugo Weaving continue as David Cartwright and Frank Harkness. Early framing teases a fatally high-stakes game of retaliation that forces the Slow Horses onto the run — classic Herron: bureaucratic knives, bad coffee, worse odds.
Apple’s August trailer kept the vibe intact: mordant jokes, rain-soaked London, and Oldman weaponizing a cigarette. Weekly drops instead of a binge dump keep the watercooler alive through mid-October, which suits a show that thrives on cliffhangers and office politics as much as gunfights.
If demoted spies still make the best television — messy, mean, and weirdly comforting — season six looks ready to prove it again. For cast returns, episode cadence, and how the novels map onto the run, check the season preview before the 16th premiere. Mark the calendar; Slough House sarcasm does not wait.
