Espionage Escalates
Slow Horses Season 6 Trailer Reveals Deadly Attacks and Sid Baker's Return on Apple TV+
Key Points
The trailer shows explicit deadly scenes: a spy is shoved from a canal boat, another is locked inside a flaming shipping container, and Moira is sprayed by masked figures—underscoring a brutal escalation against Slough House.
Frank Harkness, River Cartwright’s birth father and a key antagonist, played by Hugo Weaving, appears in the trailer, signaling a personal dimension to the threats surrounding Slough House.
Sid Baker (Olivia Cooke) makes a dramatic return and is shown in a tense moment with River Cartwright, implying a significant reunion plot thread.
Apple TV+ confirms a weekly rollout for Season 6, with episodes premiering starting September 16, 2026 and running through October 21, 2026.
New antagonists Jane and Jim (MyAnna Buring and Kyle Soller) are introduced as threats to both active and retired Slough House members, expanding the danger to the team.
Slough House is under fire — literally. Apple TV+ has released the official trailer for Slow Horses Season 6, and it promises the deadliest run yet for Gary Oldman's ragtag band of disgraced MI5 spies. The season premieres September 16, 2026, with weekly episodes running through October 21, 2026. Hello Magazine reports that the trailer confirms the dramatic return of Olivia Cooke as Sid Baker, a fan-favourite character believed dead since Season 1.
Diana Taverner, MI5's ruthless chief, warns Lamb of a kill list and an incoming "bloodbath." Lamb fires back with a quip about scientists and spies faking their deaths — nodding directly at Sid's return. The tone is clear: no one in Slough House is safe, and the team must go on the run to survive. Bleeding Cool calls the season "high-stakes" and notes it is set to run six episodes.
Sid Baker's Shocking Return Changes Everything
Olivia Cooke played Sid Baker in Season 1 before her character was left for dead. Now she's back. The trailer shows Sid in a tense, charged reunion with River Cartwright, played by Jack Lowden. Hello Magazine confirms Cooke's return is official, calling it one of the season's biggest surprises. Sid's reappearance adds a deeply personal thread to the larger threat bearing down on Slough House.
Her comeback also ties directly into Lamb's sardonic line about spies faking their deaths. It signals that Season 6 won't just be an action thriller — it will dig into the secrets and lies that hold Slough House together. Head Topics notes the reunion between Sid and River is a key plot thread for the new season.
A Kill List Targets Both Active and Retired Spies
The trailer makes clear that the threat is broad. New antagonists Jane and Jim — played by MyAnna Buring and Kyle Soller — are shown hunting down Slough House members past and present. The violence is graphic and specific: one spy is shoved off a canal boat, another is locked inside a burning shipping container, and Moira is sprayed by masked figures. These aren't warnings. They're executions.
Louisa Guy is also shown under direct threat, raising the stakes for the core ensemble. Head Topics reports that Lamb warns the entire Slough House gang to go on the run immediately. The season frames the attacks as a coordinated campaign of retaliation and revenge, not a random series of hits.
Hugo Weaving's Frank Harkness Adds a Personal Edge
Hugo Weaving appears in the trailer as Frank Harkness — River Cartwright's biological father and a key villain. His presence makes the danger personal for River, not just professional. Frank is not a random enemy. He is family, which raises uncomfortable questions about loyalty and motive. Bleeding Cool highlights Weaving's role as central to the season's antagonist structure.
The ensemble also includes Rosalind Eleazar and new addition Lenny Rush, broadening the Slough House roster heading into its most dangerous season yet. The combination of Frank's personal vendetta, Jane and Jim's external assault, and Sid's mysterious return gives Season 6 three distinct but interlocking threat lines.
Season 6 Premieres September 16 with Weekly Episodes
Apple TV+ confirmed a weekly release schedule for all six episodes. The first drops September 16, 2026, with the finale arriving October 21, 2026. Hello Magazine and Bleeding Cool both confirm the dates. The show has won Emmy and BAFTA TV Awards in previous seasons, and Apple is clearly treating this as a marquee fall title.
The trailer teases explosions, knife fights, and a deeper look at who is orchestrating the attacks on Slough House. Oldman's Lamb remains the dark, chaotic heart of the show — equal parts dangerous and darkly funny. Whether Slough House survives Season 6 intact is, based on this trailer, very much in doubt.
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