Slow Horses Season 7 is expanding its cast as Jackson Lamb prepares to hunt a mole inside the British government. Apple TV has announced that Varada Sethu, Ethan Moorhouse, Tuppence Middleton, Merab Ninidze and Joshua McGuire are joining the spy drama’s seventh season, with James Callis also returning.
Gary Oldman leads the series as Lamb, the abrasive intelligence veteran in charge of Slough House’s sidelined agents. The casting update arrives as Season 6 approaches its finale this week, with an eighth season already announced.
Who Is Joining the Slow Horses Season 7 Cast?
The five newcomers bring experience across espionage dramas, period pieces and comedy. Apple’s announcement identifies the following additions:
- Varada Sethu, whose credits include The Other Bennet Sister, Andor and Doctor Who.
- Ethan Moorhouse, known for The Moment, Ludwig and MobLand.
- Tuppence Middleton, whose credits include Downton Abbey: A New Era and Mank.
- Merab Ninidze, known for Homeland and The Courier.
- Joshua McGuire, whose credits include The Gold and Anatomy of a Scandal.
Callis’ return is part of the same announcement. Character names and descriptions for the new arrivals were not included, leaving their places in the next investigation under wraps.
Season 7 Adapts Mick Herron’s Bad Actors
The seventh season is adapted from Bad Actors, part of Mick Herron’s Slough House book series. This time, Lamb and his team must locate and neutralize a mole at the heart of the British government before the infiltrator can bring down the state.
That premise puts the agents’ next assignment inside the political establishment. It also gives the casting news a compelling backdrop: a growing ensemble is joining a story built around the search for someone operating from within.
The announcement offers that central threat without revealing how the newcomers connect to it. Fans following the television adaptation can look ahead without needing to know the novel’s twists or the outcome of the current season.
Ben Vanstone Adapts Season 7, With Robert McKillop Directing
Ben Vanstone is adapting Season 7 for television and serves as an executive producer. Robert McKillop is set to direct.
See-Saw Films, part of the Mediawan group, produces Slow Horses for Apple TV. The executive producers also include Jamie Laurenson, Hakan Kousetta, Iain Canning, Emile Sherman, Dan Hassid, Helen Gregory, Mick Herron, Gail Mutrux, Douglas Urbanski and Oldman.
The series follows MI5 agents assigned to Slough House after mistakes derail their careers. Under Lamb, their supposedly marginal department repeatedly finds itself caught up in dangerous intelligence operations, with office resentments and institutional maneuvering feeding the show’s dark humor.
When Will Slow Horses Season 7 Premiere?
Apple TV’s casting announcement does not include a Season 7 premiere date. The series’ future is already taking shape beyond that installment: Apple has also renewed it for an eighth season. Read our Slow Horses Season 8 renewal report for more on that announcement.
For now, the complete first five seasons are streaming on Apple TV, with the sixth-season finale arriving this week. Catch up before Lamb and his team take on their next assignment.
More Slow Horses Coverage
Visit our Slow Horses coverage hub for episode photos, recaps, reviews, trailers and the latest casting news.
Thomas Miller is the founder and Editor-in-Chief of Seat42F, covering television, movies and streaming entertainment. He launched Seat42F in 2007 and has spent nearly two decades covering the entertainment industry.
