The Slow Horses are about to leave the barn again. Apple TV confirmed season six of the Emmy- and BAFTA-winning spy drama premieres globally on Wednesday, September 16, 2026 — one episode that night, then weekly through October 21.
Adapted from Mick Herron’s novels 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 — Saskia Reeves, Christopher Chung, Aimee-Ffion Edwards, Rosalind Eleazar, Tom Brooke — clock back in for another round of dry British chaos.
The big reunion fans have been waiting for: Olivia Cooke reprises Sidonie “Sid” Baker. Newcomer Lenny Rush joins the ensemble, while Jonathan Pryce and Hugo Weaving continue as David Cartwright and Frank Harkness. Early press framing teases a “fatally high-stakes game of retaliation and revenge” that forces the Slow Horses onto the run — classic Herron: bureaucratic knives, bad coffee, worse odds.
Apple dropped the season-six trailer in August, and the vibe is intact: mordant jokes, rain-soaked London, and Oldman weaponizing a cigarette. Weekly drops (not 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 you’ve been waiting for the next hit of Slough House sarcasm, mark the 16th. Season six looks ready to prove that demoted spies still make the best television — messy, mean, and weirdly comforting.