Slow Horses Season 5 – Release Date, Cast and Plot Guide

Slow Horses season 5 has arrived on Apple TV+, bringing the disgraced agents of Slough House back into the spotlight for six more episodes of espionage and intrigue. The new season premiered on September 24, 2025, continuing the storylines that have made the series a critical darling since its debut.

Based on Mick Herron’s fifth novel, London Rules, season 5 sees Gary Oldman’s Jackson Lamb and his team at the center of a destabilization plot that threatens to tear through London. With terror attacks, power struggles within MI5, and a glamorous stranger at the heart of Roddy Ho’s life, the stakes have never been higher for the Slow Horses.

Here’s everything you need to know about Slow Horses season 5, from release dates to cast details, episode breakdowns, and where to watch.

When Is Slow Horses Season 5 Releasing?

Slow Horses season 5 premiered on September 24, 2025, with the first episode titled “Bad Dates.” The season consists of six episodes released weekly every Wednesday, concluding on October 29, 2025. This weekly release pattern matches the approach taken by Apple TV+ for previous seasons of the series.

The season was officially announced in June 2025, with a teaser revealing the September 24 premiere date. Filming had been completed well before the announcement, and notably, production on season 6 had also wrapped by the time season 5 premiered, demonstrating Apple’s confidence in the ongoing series.

Key Insights About Season 5

• Apple TV+ has already renewed the series through season 7, ensuring the story continues well beyond season 5
• The season adapts London Rules, the 2018 fifth novel in Mick Herron’s Slough House series
• Season 5 is not the final season, contrary to some speculation during previous years
• The series is directed by Saul Metzstein, who has helmed multiple episodes across previous seasons
• Roddy Ho, previously a supporting character, takes on a larger role in season 5’s terror plot
• The show maintains its TV-MA rating, reflecting its mature themes and content

Slow Horses Season 5 Cast and Returning Characters

Gary Oldman leads the ensemble as Jackson Lamb, the foul-mouthed, politically incorrect head of Slough House. His sardonic leadership anchors the series as the team navigates increasingly dangerous situations throughout season 5. Jack Lowden returns as River Cartwright, whose relationship with Sidonie “Sid” Guthrie (played by Rosalind Eleazar) continues to evolve.

Core Returning Cast

• Gary Oldman as Jackson Lamb – The disgraced MI5 agents’ reluctant leader
• Jack Lowden as River Cartwright – The team’s most capable operative
• Olivia Cooke – Continuing her role in the espionage drama
• Rosalind Eleazar as Sidonie “Sid” Guthrie – River’s partner and fellow Slough House agent
• Kristin Scott Thomas – reprising her role in the MI5 power hierarchy

Supporting and Additional Cast

The supporting cast brings depth to season 5’s expanded narrative. Jonathan Pryce, Saskia Reeves, Christopher Chung, and Aimee-Ffion Edwards all return in various capacities. The season introduces new dynamics around Roddy Ho’s character, played by Christopher Chung, whose glamorous girlfriend becomes a source of suspicion for the team.

What Is the Plot of Slow Horses Season 5?

Season 5 drops viewers directly into chaos as a mass shooting rocks London, intensifying an already contentious mayoral race. The Slough House team finds itself caught in the middle of terror attacks that shake the United Kingdom, while internal power struggles within MI5 threaten to destabilize the agency from within.

Key Plot Elements

The season centers on several interconnected storylines. A compromised agent operates within the intelligence community, while bizarre incidents continue to plague London. The espionage theme of “London Rules” – essentially “cover your back” – permeates every interaction as trust becomes a scarce commodity.

Suspicion falls heavily on Roddy Ho’s glamorous girlfriend, whose true allegiances remain unclear throughout much of the season. This subplot, which shifts Roddy into the terror fallout in a way that differs from his book portrayal, adds personal stakes to the larger conspiracy.

Season 5 Story Arcs

• Terror attacks threatening UK stability and security
• Power struggles within MI5 leadership
• Roddy Ho’s relationship and its connection to the conspiracy
• Lamb’s team navigating enemies both external and internal
• Sabotage, missiles, and a destabilization plot targeting London

Is There a Trailer for Slow Horses Season 5?

Apple TV+ released multiple trailers and promotional materials ahead of season 5’s premiere. The campaign included a teaser on June 6, 2025, that highlighted Gary Oldman and teased both the September 24 release date and the mysterious plot involving Roddy’s girlfriend.

The official trailer, released on September 3, 2025, offered the most comprehensive look at the season. Running two minutes and fourteen seconds, it showcased scenes of a compromised agent, London’s destabilization, and the recurring paint can motif that has become a signature visual element of the series.

Available Promotional Materials

• Season 5 Teaser (0:26, June 6, 2025) – Features Gary Oldman, release date confirmation
• Official Trailer (2:14, September 3, 2025) – Comprehensive season preview
• Season 5 Trailer (1:59) – Additional promotional cut
• Episode 6 Sneak Peek (1:50) – Preview of the season finale

All trailers and promotional materials are available on Apple TV+’s official YouTube channel and the streaming platform itself. The official trailer notably incorporated the paint can motif that has appeared throughout the series, reinforcing continuity for longtime viewers.

Where and How to Watch Slow Horses Season 5

Slow Horses season 5 streams exclusively on Apple TV+, continuing the platform’s strategy of using the espionage thriller as a flagship original series. The service offers the entire season with new episodes releasing weekly every Wednesday.

Viewers can access the series through an Apple TV+ subscription, available through the Apple TV app across iPhone, iPad, Apple TV, Mac, and supported smart TVs and streaming devices. The platform offers a free trial period for new subscribers.

Platform Details

• Streaming Service: Apple TV+
• Release Schedule: Weekly, Wednesdays
• Content Rating: TV-MA (Mature Audiences)
• Genre: Drama, Thriller
• Availability: Global (Apple TV+ markets)

Episode-by-Episode Breakdown

Season 5 unfolds across six episodes, each building on the previous installment to deliver a cohesive seasonal narrative. Here’s the complete episode guide for the season.

1. “Bad Dates” – September 24, 2025: A mass shooting rocks London, intensifying the mayoral race. Shirley suspects a Slow Horse was specifically targeted.
2. “Incommunicado” – October 1, 2025: Lamb intercepts an assassin while Taverner gathers intel on the Abbotsfield shooting.
3. “Tall Tales” – October 8, 2025: Sabotage brings London to a halt. Taverner questions Roddy while Coe grows suspicious of the team’s movements.
4. “The Devil’s Choice” – October 15, 2025: A high-stakes operation puts the team in direct conflict with external threats.
5. “The Reckoning” – October 22, 2025: The destabilization plot reaches its climax as truths emerge about internal betrayals.
6. “London Rules” – October 29, 2025: The season finale brings resolution to multiple storylines while setting up future conflicts.

Frequently Asked Questions