Apple TV has been on absolute fire lately, and if you’re a fan of high-stakes spy thrillers, one of the best shows on any streaming service is officially coming back.
Slow Horses is returning for Season 6 next month, and Apple just dropped a brand-new trailer packed with insane surprises—including two major returning cast members, one of whom everyone assumed was written off for good.
Spoiler Alert: If you want to dive into Season 6 completely blind, stop reading right here!
Release Schedule & Streaming Info
Mark those calendars, because Slow Horses Season 6 officially premieres on Wednesday, September 16.
Apple is sticking to its signature weekly release model. You’ll get one episode right out of the gate on launch day, followed by new episodes dropping every single Wednesday through October 21.
| Release Detail | Specs & Timelines |
| Premiere Date | Wednesday, September 16, 2026 |
| Launch Episode | 1 Episode at Premiere |
| Release Cadence | Weekly on Wednesdays |
| Season Finale | October 21, 2026 |
The Major Character Reveals
While the trailer delivers plenty of trademark Slough House chaos and dark humor, two specific character returns steal the show:
- Sidonie “Sid” Baker (Olivia Cooke): Easily the biggest shocker of the trailer. We haven’t seen Sid since Season 1, where her fate was left looking grim and she was widely presumed dead. Seeing House of the Dragon star Olivia Cooke back in action completely recontextualizes what went down in the early days of the series.
- Frank Harkness (Hugo Weaving): The heavy-hitting Season 4 villain—who shares a deep, personal connection with River Cartwright—is officially back on the board to cause more mayhem.
How to Watch
You can catch up on all previous seasons right now and stream Season 6 when it drops this September exclusively on Apple TV.
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