Apple TV+'s hit spy series Slow Horses is coming back for a fourth season, and there have already been several exciting updates about the cast, story, and release date. Debuting in 2022 and based on the novel series Slough House by Mick Herron, the show follows a misfit band of MI5 agents as they try to protect England from threats both foreign and domestic, while also dealing with their strange boss. Anchored by legendary character actor Gary Oldman, Slow Horses turns the spy genre on its ear with humor without sacrificing any pulse-pounding thrills.

From the outset, Slow Horses was a critical darling, and each season has scored well above 90% on Shows like Slow Horses are a rare breed, and it is clear that Apple TV+ has been pleased with its performance as one of their crowning jewel original programs. With that in mind, Slow Horses season 4 is coming sooner than expected.

Slow Horses Season 4 Latest News

A Trailer For Season 4 Is Revealed

After a few funny and exciting action sequences, the trailer implies that one team member isn't making it out of season 4 alive.

With the release date for the fourth season getting closer, the latest news comes in the form of a trailer for Slow Horses season 4. The enticing tease opens with a recap of Jackson Lamb's position at Slough House and the rough-and-tumble nature of his team. The trailer then showcases a car bombing at a busy shopping mall and introduces Hugo Weaving's new villain character, a ruthless terrorist. After a few funny and exciting action sequences, the trailer implies that one team member isn't making it out of season 4 alive.

Slow Horses Season 4 Release Date

The Slough House Agents Return In September

Proving that streaming-exclusive shows don't need multiple years between seasons, Slow Horses season 4 will arrive less than a year after the debut of season 3. Apple TV+'s spy hit will debut two new episodes on Wednesday, September 4, 2024, before returning to the weekly episode format. The reason for the quick turnaround is that Apple TV+ renewed the show for seasons 3 and 4 simultaneously, which allowed both them to shoot back-to-back.

Slow Horses season 3 debuted on November 29, 2023.

Slow Horses Season 4 Cast

All The New & Returning Faces For Season 4

Unlike other shows that merely announce a future season but provide little else by way of information, much is currently known about the cast of Slow Horses season 4. Several new faces will be appearing in the fourth season's cast including Hugo Weaving (The Matrix), Joanna Scanlan (Notes on a Scandal), James Callis (Battlestar Galactica), Ruth Bradley (Guilt), and Tom Brooke (Empire of Light). Though they have been announced, nothing is known about who their new characters will be.

The entire main ensemble was also announced to be reprising their roles in season 4 as well, with Gary Oldman leading the charge as the slovenly leader of Slough House, Jackson Lamb. Jack Lowden will also be back as younger agent River Cartwright, ed by the likes of Kristen Scott Thomas as Diana Taverner and veteran character actor Jonathan Pryce as David Cartwright.

The entire known cast of Slow Horses season 4 includes:

Slow Horses Season 4 Potential Story

Season 4 Adapts The Book "Spook Street"

That rather vague description sounds a lot like the plot of Mick Herron's novel Spook Street, which seems to suggest that each season is tackling a single book.

Along with the announcement that Slow Horses season 4 was happening, audiences were given the smallest of hints about what the episodes would be about. Season 4 will "open with a bombing that detonates personal secrets, rocking the already unstable foundations of Slough House". That rather vague description sounds a lot like the plot of Mick Herron's novel Spook Street, which seems to suggest that each season is tackling a single book.

In the aforementioned book, a former spy begins to slowly lose his mind, which sends him on a deadly rampage of destruction, including the bombing of a crowded shopping mall. This personal connection will probably be the heart of season 4, as the of Slough House must begin to reckon with their own failures, and look inward at what being an MI5 Agent really means. It is unclear how closely Slow Horses season 4 will follow the book, but it already promises to be the most enthralling outing yet.

Slow Horses Season 4 Trailer

Watch The Full Trailer Here

In anticipation of the show's September release date, Apple TV+ has unveiled a full-length trailer for Slow Horses season 4. Catching back up with Jackson Lamb and his team of cast-offs at Slough House, the trailer kicks into high gear with a car bombing at a shopping mall. Hugo Weaving's new terrorist villain is behind the attack and has assembled a hit squad to cause more deadly havoc. Things continue to get out of hand as the action escalates and it's implied that one team member won't make it out of Slow Horses season 4 alive.