- 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)
- Aimee-Ffion Edwards (Shirley Dander)
Slow Horses — S6E1
Episode: Circle of Life
Air Date: 2026-09-16
Runtime: 48 min
Overview
River braces for his grandfather's funeral. Lamb looks into the death of an ex–Slow Horse.