Season 3 of "Slow Horses" aired on Apple TV+ starting in November 2023
Slow Horses season 3 premiered on Apple TV+ on November 29, 2023. The season ran for six episodes, with new episodes released weekly on Wednesdays through January 3, 2024. If you have an active Apple TV+ subscription, you can stream all six episodes now — they are no longer behind a weekly release schedule and are available to watch in any order.
The season follows the MI5 agents at Slough House as they navigate a new crisis involving a missing Russian dissident and a potential security breach. Gary Oldman returns as Jackson Lamb, the slovenly but brilliant head of the dumping ground department where MI5 sends its worst performers. The plot picks up directly after season 2, so watching the earlier seasons first is necessary to understand the characters and their relationships.
Key Takeaways
- All six episodes of season 3 are available to stream on Apple TV+ if you have a current subscription, with no weekly wait required.
- The season aired from November 29, 2023, through January 3, 2024, with one new episode each Wednesday during that period.
- Gary Oldman, Kristin Scott Thomas, and the main cast return for the third season alongside new characters tied to the Russian dissident storyline.
- Season 4 has already been ordered by Apple TV+, though no premiere date has been announced yet.
- You need an active Apple TV+ subscription to watch; the service costs $9.99 per month with ads or $12.99 per month ad-free.
How to watch season 3 right now
You need an active Apple TV+ subscription to watch season 3. If you already subscribe, open the Apple TV app on your device, search for "Slow Horses," and select the show. All six episodes are available to watch when ready, though watching from episode 1 of season 3 onward makes the most sense for following the plot and character arcs.
Apple TV+ costs $9.99 per month for the standard plan with ads, or $12.99 per month for ad-free viewing. Some Apple device bundles and other services include Apple TV+ as part of a package deal, so check whether you already have access through another subscription or a device purchase. The app works on iPhones, iPads, Mac computers, Apple TV devices, and most smart televisions.
What happens in season 3
Season 3 centers on a Russian dissident named Katya Chubb who goes missing in London. Jackson Lamb and his team at Slough House are drawn into the investigation, which pulls them into a larger geopolitical conflict involving espionage, betrayal, and the messy reality of intelligence work. The season introduces new characters and raises the stakes for the existing cast, delivering the same blend of dark humor, tense action, and character-driven drama that made the first two seasons popular.
The plot involves multiple layers of deception and competing agendas within MI5 itself. Without spoiling specific moments, the season explores how Lamb's unconventional methods clash with official channels, and how his team members navigate loyalty, survival, and their own moral compromises. The Russian dissident storyline serves as the central thread that connects the various character arcs and conflicts throughout the six episodes.
The cast returns for season 3
Gary Oldman leads the ensemble as Jackson Lamb, the chain-smoking, perpetually hungover spymaster whose sharp mind and crude exterior mask genuine intelligence work. Kristin Scott Thomas plays Diana Taverner, the ambitious MI5 official who often finds herself at odds with Lamb. Jack Lowden, Sophia Brown, Royce Pierreson, and the rest of the Slough House team return in their roles, bringing continuity and depth to characters viewers have followed since season 1.
New cast members join for season 3, including Ruth Bradley and others who play characters connected to the Russian dissident plot and the larger intelligence operation. The show maintains its reputation for strong acting across the board, with Oldman's performance as Lamb remaining the centerpiece. The chemistry between returning cast members and the introduction of new faces keeps the ensemble fresh while maintaining the show's tone and style.
Season 4 is already in the works
Apple TV+ ordered season 4 of "Slow Horses" before season 3 even finished airing, a sign of the show's popularity on the platform. However, no premiere date has been announced yet. Based on the gap between previous seasons, season 4 will likely arrive sometime in 2024 or 2025, though that timing is not confirmed by Apple TV+ or the production team.
The show is based on Mick Herron's Jackson Lamb novels, and there is enough source material for multiple additional seasons if Apple TV+ and the production team choose to continue. The books provide a deep well of storylines and character development that could sustain the show for several more years, depending on how closely the television adaptation follows the source material.
Where to find information about future seasons
Apple TV+ announces new premiere dates through its official website and social media accounts on platforms like Instagram, Twitter, and Facebook. You can also check the "Slow Horses" page within the Apple TV app itself — it will display information about upcoming seasons once dates are set. Following Apple TV+ on social media or checking entertainment news sites will keep you informed about when season 4 arrives and what to expect.
The Apple TV app also sends notifications to subscribers about new releases and upcoming premieres if you enable notifications in your account settings. This is often the fastest way to learn about season 4 the moment Apple TV+ makes an announcement.
Frequently Asked Questions
Do I need to watch seasons 1 and 2 before season 3?
Yes. Season 3 continues directly from the events of season 2 and assumes you know the characters, their relationships, and the ongoing plot threads. Watching the first two seasons first will make season 3 much more enjoyable and easier to follow.
How many episodes are in season 3?
Season 3 has six episodes, each roughly 50 to 60 minutes long. All six are available to watch whenever you want if you have an Apple TV+ subscription.
Can I watch season 3 for free?
No. "Slow Horses" is exclusive to Apple TV+, and you need a paid subscription to watch it. Apple TV+ does not offer a free tier, though some Apple device purchases or bundles include a trial period.
Is season 3 the last season?
No. Apple TV+ has ordered season 4, so the show will continue. A premiere date for season 4 has not been announced yet.
Where was season 3 filmed?
Like the previous seasons, season 3 was filmed primarily in London and other parts of the United Kingdom. The show uses real London locations to ground the spy thriller in an authentic setting.