Slow Horses Season 6 Cast – Story, Trailer & Release Date: Slow Horses Season 6 is almost here. The Apple TV+ spy drama has become one of the platform’s most popular shows since it first premiered in 2022.
The series has also followed a rare yearly release schedule. Season 2 arrived in 2022, followed by Season 3 in 2023, Season 4 in 2024, Season 5 in 2025 and Season 6 in 2026. Gary Oldman returns as Jackson Lamb in the new season, alongside several familiar faces.
In this article, you will find the confirmed Slow Horses Season 6 cast, characters, story, trailer and release information.
Slow Horses Season 6 Cast
Below is confirmed cast list for Slow Horses Season 6.
| Actor/Actress | Character |
|---|---|
| Gary Oldman | Jackson Lamb |
| Jack Lowden | River Cartwright |
| Olivia Cooke | Sid Baker |
| Jonathan Pryce | David Cartwright |
| Kristin Scott Thomas | Diana Taverner |
| Freddie Fox | James “Spider” Webb |
| Rosalind Eleazar | Louisa Guy |
| Christopher Chung | Roddy Ho |
Slow Horses Season 6 Cast & Character Details
Below is the characters details for Slow Horses Season 6.
Gary Oldman as Jackson Lamb
Gary Oldman returns as Jackson Lamb. Lamb leads the group of MI5 agents working at Slough House. These agents were sent to the department after making career mistakes. Despite their poor reputation, they often become involved in serious intelligence cases.
Lamb is known for his rough personality and sharp sense of humor.
Jack Lowden as River Cartwright
Jack Lowden plays River Cartwright. River is one of the MI5 agents working at Slough House. He is ambitious and wants to prove that he belongs in the main intelligence service.
Olivia Cooke as Sid Baker
Olivia Cooke returns as Sid Baker. Sid has been an important part of the series since the beginning. Her fate has remained uncertain for a long time, but the Season 6 trailer confirms her return.
Jonathan Pryce as David Cartwright
Jonathan Pryce plays David Cartwright. David is a senior intelligence figure and also River’s grandfather. His experience and knowledge of MI5 make him an important character in the story.
Kristin Scott Thomas as Diana Taverner
Kristin Scott Thomas returns as Diana Taverner. Diana is one of the most powerful people in MI5. In Season 6, she pulls the Slough House team into a dangerous situation involving revenge and retaliation.
Freddie Fox as James “Spider” Webb
Freddie Fox plays James “Spider” Webb. Spider is another MI5 officer who has a complicated relationship with the Slough House team.
Rosalind Eleazar as Louisa Guy
Rosalind Eleazar returns as Louisa Guy. Louisa is one of the agents working at Slough House. She has been involved in several major missions throughout the series.
Christopher Chung as Roddy Ho
Christopher Chung plays Roddy Ho. Roddy is the team’s technology expert and one of the more unusual members of Slough House.
Slow Horses Season 6 Story
Slow Horses follows a group of British spies who work at Slough House. They are sent there after making mistakes in their jobs. But their new work soon puts them in dangerous situations.
In Season 6, the entire team finds itself on the run. Diana Taverner pulls the group into a dangerous game of revenge and retaliation. Jackson Lamb and his team must deal with the growing threat while trying to stay alive.
The new season will once again mix espionage, danger and dark comedy.
Slow Horses Season 7
Slow Horses Season 7 is already in the works. The seventh season will be based on Bad Actors, a novel from Mick Herron’s Slough House book series. The story will follow Lamb and his team as they search for a mole inside the British government.
Christopher Chung has also suggested that Season 7 could arrive in 2027, continuing the show’s yearly release pattern.
Slow Horses Season 8
Apple TV+ has also renewed Slow Horses for Season 8. The eighth season is expected to be based on Clown Town, the ninth book in Mick Herron’s series. Season 8 will focus on another major confrontation between Jackson Lamb and Diana Taverner.
Slow Horses Season 6 Trailer
Watch the trailer for Slow Horses Season 6 here.
Slow Horses Season 6 Release Date
Slow Horses Season 6 premieres on September 16, 2026, on Apple TV+. New episodes will be released weekly on Wednesdays.
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FAQs: Slow Horses Season 6
Q1. When Can We Watch Slow Horses Season 6?
Slow Horses Season 6 premieres on 16 September, 2026.
Q2. Does Olivia Cooke Return in Season 6?
Yes, she does. Olivia Cooke reprises her role as Sid Baker as Season 6 trailer makes clear.
Q3. How Frequently Are the New Episodes of Season 6 Released?
New episodes of Slow Horses Season 6 will come out every Wednesday.
Q4. Is There Gonna Be a Season 7 of Slow Horses?
Yes, there is. Slow Horses Season 7 is set to be released in 2027, although the precise date remains unknown for now. This season is based on Mick Herron’s novel Bad Actors.
