Returning Cast Members and Guest Stars Confirmed for ‘Slow Horses’ Season 6

The critically acclaimed espionage series ‘Slow Horses‘ continues to expand its world of covert operations, political maneuvering, and administrative exile. As the drama prepares for its sixth season, several notable actors are slated to make long-awaited returns while new guest stars enter the narrative to challenge Jackson Lamb and his team of sidelined operatives.

From familiar faces returning after extended absences to dangerous assassins and pivotal witnesses, the upcoming installment brings significant shifts to the ensemble. Here is every confirmed returning cast member and guest star appearing in season six of ‘Slow Horses’.

Olivia Cooke

Olivia Cooke portrays Sidonie “Sid” Baker, a highly competent and sharp MI5 operative first introduced in the debut season of ‘Slow Horses’. Despite her evident operational talent and professional promise, she was inexplicably assigned to Slough House alongside River Cartwright. Her character’s fate remained ambiguous following the dramatic events of the first season, leaving unanswered questions about her survival and status within the service. Cooke officially reprises her role as Sid in the sixth season of the acclaimed spy thriller.

Paul Higgins

Paul Higgins plays Struan Loy, an administrative officer who was exiled to Slough House in the opening season of ‘Slow Horses’. His career at Regent’s Park was derailed after he sent an inappropriate workplace email that breached intelligence protocol. Throughout his initial tenure under Jackson Lamb, Struan struggled to cope with the monotonous paper-sorting duties assigned to the service’s rejects. Higgins makes his return to the series in season six as Slough House becomes entangled in another high-stakes security crisis.

Harry Lloyd

Harry Lloyd joins the ensemble of ‘Slow Horses’ for season six as Damien Cantor. Cantor is introduced as an influential right-wing media mogul and the owner of a major news channel. His character plays a significant role in shaping public narratives and exerting political leverage across London. Lloyd’s inclusion brings a powerful media dimension into the narrative that complicates the clandestine operations of British intelligence.

Kyle Soller

Kyle Soller appears in season six of ‘Slow Horses’ as a lethal operative named Jim. Jim functions as a ruthless contract killer tasked with hunting down and eliminating agents stationed at Slough House. His presence introduces severe physical danger for Jackson Lamb’s team as they find themselves targeted in an organized manhunt. Soller brings intense suspense to the storyline as his character relentlessly pursues the vulnerable intelligence officers.

MyAnna Buring

MyAnna Buring enters the cast of ‘Slow Horses’ for season six as an assassin named Jane. Operating in tandem with her fellow killer Jim, Jane is dispatched to execute active hits against the personnel residing at Slough House. Her lethal mission forces the discarded MI5 operatives to fight for their lives while navigating hostile territory. Buring’s character elevates the stakes of the season as the protagonists attempt to discover who sanctioned the contract against them.

Dylan Smith

Dylan Smith features in the sixth season of ‘Slow Horses’ portraying Andrew Nesmith. Nesmith is a former member of the Dogs, the internal security and tactical enforcement unit of MI5. Having gone rogue from the service, he is on the run in possession of critical stolen intelligence that poses a major threat to national security. His actions trigger a frantic pursuit that draws both Slough House and hostile external forces into a dangerous confrontation.

Lenny Rush

Lenny Rush joins the cast of ‘Slow Horses’ for season six as Reece Nesmith. Reece is the son of rogue former operative Andrew Nesmith and gets caught directly in the crosshairs of the unfolding espionage conflict. As a key child witness with knowledge of critical events, he becomes a person of interest to multiple competing intelligence factions. Rush portrays the pivotal young character whose safety becomes closely tied to the survival of the Slough House team.

Share your thoughts in the comments on which returning character or new guest star you are most excited to see in season six of ‘Slow Horses’.