The Secret Lives Of Slow Horses Stars: What Gary Oldman, Jack Lowden & Co. Are Doing Now (2025 Updates)

The "Slow Horses" cast, known for their brilliantly flawed portrayals of MI5’s disgraced agents, continues to captivate global audiences. As of December 10, 2025, the buzz around Slough House is louder than ever, with Season 5 on the horizon and major career developments for the ensemble. This article dives deep into the latest updates, recent projects, and full profiles of the stars who bring Mick Herron’s acclaimed *Slough House* novels to life. The show's success on Apple TV+ has propelled its core cast into a new echelon of fame, yet they remain grounded in diverse and challenging roles outside of their spy work. From directorial debuts to major stage returns and a Knighthood, the stars of the dysfunctional spy thriller are anything but "slow" in their professional lives.

The Slough House File: Complete Cast Biographies and Profiles

The heart of *Slow Horses* lies in its ensemble of "joes," the MI5 rejects led by the cynical and flatulent Jackson Lamb. Here is a detailed look at the core cast, their essential details, and career highlights.

Gary Oldman (Jackson Lamb)

• Role: Jackson Lamb, the slovenly, brilliant, and perpetually dissatisfied head of Slough House.
• Born: March 21, 1958, in New Cross, London, England.
• Career Highlights: Academy Award winner (Best Actor, *Darkest Hour*), BAFTA winner, Golden Globe winner. Known for iconic roles as Sid Vicious (*Sid and Nancy*), Sirius Black (*Harry Potter* series), Jim Gordon (*The Dark Knight* trilogy), and George Smiley (*Tinker Tailor Soldier Spy*).
• Recent Update (2025): Oldman was made a Knight Bachelor by King Charles III in the 2025 Birthday Honours for his services to drama. He is also set to return to the stage to star in Samuel Beckett's one-act masterpiece, *Krapp's Last Tape*, in Spring 2025.

Jack Lowden (River Cartwright)

• Role: River Cartwright, the ambitious, high-achieving MI5 agent exiled to Slough House after a spectacular blunder.
• Born: June 2, 1990, in Chelmsford, Essex, England (grew up in Oxton, Scotland).
• Career Highlights: Olivier Award winner for his stage work. Notable film roles include *Dunkirk*, *Mary Queen of Scots*, and playing war poet Siegfried Sassoon in *Benediction*.
• Personal Update: Lowden recently married his *Mary Queen of Scots* co-star, actress Saoirse Ronan, in a private ceremony in Edinburgh.

Kristin Scott Thomas (Diana Taverner)

• Role: Diana Taverner, the Deputy Director-General of MI5, a formidable, ruthless, and impeccably dressed figure often referred to as "Lady Di."
• Born: May 24, 1960, in Redruth, Cornwall, England.
• Career Highlights: Oscar nominee (*The English Patient*), BAFTA winner, five-time Olivier Award nominee. Known for films like *Four Weddings and a Funeral*, *Gosford Park*, and *Darkest Hour* (alongside Oldman). She holds both British and French citizenship.

Key Supporting Cast

• Saskia Reeves (Catherine Standish): Lamb’s long-suffering, recovering alcoholic administrative assistant and confidante. Born August 16, 1961.
• Rosalind Eleazar (Louisa Guy): A former MI5 agent with a strong moral compass and exceptional field skills, navigating the complex dynamics of Slough House. Born August 29, 1989.
• Christopher Chung (Roddy Ho): The arrogant, socially awkward, yet indispensable computer expert and hacker. He was nominated for a BAFTA for his performance.

What the Slow Horses Stars Are Working on Right Now (2024–2025 Projects)

The cast’s commitment to varied and high-profile projects demonstrates their immense talent beyond the world of Slough House. Their recent and upcoming work in 2024 and 2025 is a testament to their status as some of the industry’s most sought-after actors.

The Big Screen and Stage Returns

While Gary Oldman continues to be the anchor of the series, his recent activities have focused on major artistic endeavors. His return to the theatre in 2025 for *Krapp's Last Tape* marks a significant move back to the stage, showcasing his versatility beyond cinema and television. Similarly, Dame Kristin Scott Thomas has recently branched out into directing and writing, with her deeply personal film *My Mother's Wedding* serving as her directorial debut. The film, which she also co-wrote and starred in, was a major project for her in 2024 and 2025, with her also preparing for a new French film role.

Jack Lowden, the star who plays the perpetually frustrated River Cartwright, is currently one of the busiest actors in the cast. His filmography for 2024 and 2025 is packed, including roles in the highly anticipated films *The Outrun* (2024), *Tornado* (2025), and *Ella McCay* (2025). Lowden's continuous work in independent and major films solidifies his position as a leading man in British cinema.

Television Thrillers and New Leads

The supporting cast members are also landing major leading roles in other television projects.

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• Rosalind Eleazar’s Netflix Lead: Rosalind Eleazar (Louisa Guy) has taken on a major lead role in the Netflix adaptation of Harlan Coben’s thriller novel, *Missing You*. The series premiered in early 2025 and sees her take center stage in a high-stakes drama, a significant move for the actress.
• Saskia Reeves in *The Outrun*: Saskia Reeves (Catherine Standish) also appeared in the 2024 film *The Outrun* alongside Lowden, demonstrating a continued collaboration among the *Slow Horses* family. She also earned an Olivier nomination for her work in the stage play *Separation*.
• Christopher Chung’s Dual Life: Christopher Chung (Roddy Ho), who was nominated for a BAFTA for his role, has revealed that despite his success on the show, he continues to work as a personal trainer for a group of clients, maintaining a surprising and grounded second career.

Future of Slough House: Seasons 5 and 6 Updates

Fans of the espionage series have much to look forward to, with Apple TV+ confirming not only Season 5 but also an unprecedented Season 6, securing the future of the *Slow Horses* franchise for years to come.

Season 5: New Faces and Core Cast Return

Season 5 is set to adapt the fifth book in Mick Herron’s series, *London Rules*, which sees the Slough House team investigate a series of cyber attacks. The core cast—including Gary Oldman, Jack Lowden, Kristin Scott Thomas, Saskia Reeves, Rosalind Eleazar, and Christopher Chung—are all confirmed to return.

The upcoming season will introduce new talent to the Slough House ecosystem, adding fresh dynamics to the already complex narrative. Notable new cast members for Season 5 include:

• Nick Mohammed: The *Ted Lasso* star joins the cast in an undisclosed role, generating significant fan speculation.
• Cherrelle Skeete: She will debut as Devon Welles, an MI5 Deputy Dog, a new figure likely to clash with Diana Taverner and the Slough House crew.

The premiere of Season 5 is currently anticipated to be around September 24, 2025, continuing the show’s tradition of high-octane, witty spy drama.

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Season 6: Adapting the Final Books

The announcement of Season 6 is particularly exciting, as it confirms the show's intent to adapt the subsequent books in Herron’s series, *Joe Country* and *Slough House*. This commitment ensures that the story of Jackson Lamb and his "slow horses" will get a comprehensive and satisfying arc, following the complex political and personal fallout of their previous missions.

The continued success of the series, driven by the superb performances of its cast and the sharp writing, proves that even the most disgraced agents can become television's most compelling heroes. The stars of *Slow Horses* are clearly enjoying a career high, with a steady stream of acclaimed projects ensuring they remain at the forefront of British drama, both inside and outside the murky confines of Slough House.