Slow Horses
Wednesday
7
October 2026
S6E4 · Lost & Found
Follow a dysfunctional team of MI5 agents—and their obnoxious boss, the notorious Jackson Lamb—as they navigate the espionage world's smoke and mirrors to defend England from sinister forces.
Slow Horses Season 6 Episode 4 airs Wednesday, October 7, 2026. Track your progress and get a reminder before air time — free, no ads.
Cast
- Gary Oldman — Jackson Lamb
- Jack Lowden — River Cartwright
- Kristin Scott Thomas — Diana Taverner
- Hugo Weaving — Frank Harkness
- Saskia Reeves — Catherine Standish
- Christopher Chung — Roddy Ho
- Rosalind Eleazar — Louisa Guy
- Aimee-Ffion Edwards — Shirley Dander
Season schedule
Season 1
6 episodes
—
Season 2
6 episodes
—
Season 3
6 episodes
—
Season 4
6 episodes
—
Season 5
6 episodes
—
Season 6
6 episodes
October 7, 2026