Slow Horses (2022)
Old sins cast new shadows.
Overview
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.
StatusReturning Series
TypeScripted
Original LanguageEnglish
Network
Seasons
Season 1
2022 | 6 Episodes
Season 1 of Slow Horses premiered on April 1, 2022
When a young man is kidnapped and threatened with beheading, the slow horses find themselves unexpectedly embroiled in a dangerous case that forces them to prove their worth.
Season 2
2022 | 6 Episodes
Season 2 of Slow Horses premiered on December 2, 2022
Long-buried Cold War secrets emerge which threaten to bring carnage to the streets of London. When a liaison with Russian villains takes a fatal turn, our hapless heroes must overcome their individual failings and raise their spy game in a race to prevent a catastrophic incident.
Season 3
2023 | 6 Episodes
Season 3 of Slow Horses premiered on November 29, 2023
A romantic liaison in Istanbul threatens to expose a buried MI5 secret in London. When Jackson Lamb and his team of misfits are dragged into the fight, they find themselves caught in a conspiracy that threatens the future not just of Slough House but of MI5 itself.
Season 4
2024 | 6 Episodes
Season 4 of Slow Horses premiered on September 4, 2024
In season 4, a bombing detonates personal secrets, rocking Slough House's already unstable foundations.
Season 5
2025 | 6 Episodes
Season 5 of Slow Horses premiered on September 23, 2025
In season five, everyone is suspicious when resident tech nerd Roddy Ho has a glamorous new girlfriend. When a series of increasingly bizarre events occur across the city, it falls to the Slow Horses to work out how everything is connected. After all, Lamb knows that in the world of espionage, the London Rules — cover your back — always apply.
Casts
Gary Oldman
Jackson Lamb
Jack Lowden
River Cartwright
Kristin Scott Thomas
Diana Taverner
Saskia Reeves
Catherine Standish