The sixth season of Slow Horses, which premiered globally on Apple TV on 16 September 2026, marks a significant turning point for the espionage drama. For the first time, the series proceeds without the guiding hand of Will Smith, the writer whose earlier work on The Thick of It and Veep gave this spy saga its characteristically sharp comic sensibility. The absence of Smith's distinctive drollery becomes apparent in a more straightforward narrative approach, yet the underlying challenge runs deeper: this is a creative work beginning to show signs of natural creative fatigue.
The fundamental tension that has always defined Slow Horses remains intact. The staff of Slough House—a backwater division of MI5 where underperforming agents and troublemakers are relegated to tedious assignments rather than dismissed outright—consistently outmaneuver supposedly superior operatives despite their own incompetence and dysfunction. River Cartwright, portrayed by Jack Lowden, embodies this contradiction: he possesses the appearance and some of the technical abilities of a conventional spy protagonist, yet he is simultaneously brittle, unlucky, and prone to self-pity, requiring rescue from near-fatal situations with regularity. The show's comic elements have historically allowed viewers to overlook the implausibility that such a dysfunctional unit would survive repeated encounters with genuine threats, and the decision to set traditional espionage narratives against decaying British urban landscapes continues to offer refreshment. However, sustaining this delicate balance becomes progressively more difficult with each passing season.
The creative decline became visible during season five, Smith's final outing, which relied on a formulaic plot centered on generic terrorist antagonists delivering consequences for British foreign policy misadventures. The show simultaneously fell victim to a common pitfall affecting acclaimed ensemble dramas: the temptation to elevate beloved supporting characters into more prominent roles often proves irresistible, yet these performers do not always possess the range to sustain expanded screen time. This fate befell Roddy Ho, the computer-bound technician played by Christopher Chung, whose earlier sardonic commentary from his workstation gave way to an insufferable central role. Even Gary Oldman, the series' marquee star, might have benefited from remaining in the background as Jackson Lamb, the physically repugnant yet intellectually formidable head of Slough House. Oldman's portrayal remains a brilliantly conceived and expertly executed caricature, but by season five his presence had begun to lose its potency.
New lead writer Gaby Chiappe, whose previous credits include the understated dramas Veep and The Thick of It, inherits a production facing multiple creative pressures. Her response involves repositioning Slow Horses as a more conventional thriller, with geopolitical complexity largely relegated to the background, while the Slough House ensemble encounters unexpected reappearances from the past. The season's central plot device involves the systematic elimination of former team members. Struan Loy, played by Paul Higgins, returns only to meet a gruesome death in the characteristically bleak Slow Horses setting of a shipping container abandoned on a desolate estuary mudflat. When two ruthlessly efficient assassins, portrayed by MyAnna Buring and Kyle Soller, demonstrate no intention of limiting their targets to forgotten operatives from the show's early seasons, the entire unit finds itself in flight.
Beyond Loy's tragic reappearance, the season resurrects several characters whose departures had seemed final. Rosalind Eleazar returns as Louisa, Joanna Scanlan reprises her role as Moira, and Hugo Weaving reappears as Frank, the morally vacant mercenary who is also, somewhat implausibly, River's biological father—a character arc that appeared to reach satisfying closure in season four. While none of these returns feels actively unwelcome, the pattern of cycling through familiar faces carries an unmistakable suggestion of creative resource depletion.
The central narrative weakness, however, lies in the plot itself, which essentially amounts to an extended pursuit sequence. The assassins maintain their offensive while the Slow Horses operatives, primarily River, flee in disorganized fashion—a dynamic that frequently requires the trained killers to inexplicably lose their competence to prevent the story from concluding prematurely. The sharp verbal exchanges that once defined the series have lost their edge, and contemporary political parallels—aside from references to Russia—no longer carry the same resonance. This diminishment makes the appearance of familiar thriller conventions, such as elite assassins who cannot execute basic marksmanship, increasingly conspicuous. Despite casting performers of Buring and Soller's caliber in the antagonist roles, the production curiously never develops these characters with any depth. Harry Lloyd similarly struggles to register as a malevolent media proprietor who blackmails MI5 director Diana Taverner, played by Kristin Scott Thomas, never receiving sufficient narrative space to demonstrate his evident potential.
The season does benefit from the addition of Lenny Rush, an actor whose mere presence elevates any production in which he appears, cast here as a civilian inadvertently caught in the year's chaos. The six-episode season adapts material from the sixth and seventh novels in Mick Herron's Slough House series, with episodes released weekly rather than in a binge format. Despite its continued technical polish and assured execution, the series gives the impression of having exhausted its creative possibilities.
What happens next
The season unfolds across six weekly installments. Following the premiere episode, titled Circle of Life, subsequent episodes titled Daddy Issues, Resurrection, Lost and Found, and Sayonara will arrive on 23 September, 30 September, 7 October, and 14 October 2026 respectively, with the season finale scheduled for 21 October 2026.
Key Facts
- Season six marks the first season without original showrunner Will Smith, whose previous work on political satires gave the series its distinctive comedic voice
- The season adapts material from Mick Herron's sixth and seventh Slough House novels, representing a new adaptation point for the series
- New lead writer Gaby Chiappe has repositioned the show as a more conventional thriller with reduced emphasis on political satire and comic banter
- The season features returning cast members including Rosalind Eleazar, Joanna Scanlan, and Hugo Weaving alongside new antagonists played by MyAnna Buring and Kyle Soller
- Episodes release weekly on Apple TV through 21 October 2026 rather than in a complete binge drop
