'Slow Horses' Season 4 Adds A-Listers Including Hugo Weaving & Joanna Scanlan

Slow Horses will add several new faces to the cast when it returns for Season 4. No, that's not a typo; I said Season 4, even though Season 2 only aired in December 2022, and Season 3 does not yet have a release date to stream on Apple TV+. However, Apple's executives made the unusual move after seeing how critics received Season 1 in April 2022 and decided to go all in on the series, greenlighting Seasons 3 and 4 before Season 2 was even ready to come to the small screen. The two new seasons are being filmed back to back, and with Season 3 now complete, Season 4 is underway.

The new cast includes several significant A-list gets, starting with Hugo Weaving, who made a name for himself by starring in The Matrix, The Lord of The Rings, and the Marvel big screen franchises back-to-back-to-back before moving to TV for series like Patrick Melrose. He'll be joined by The Larkins' Joanna Scanlan and Battlestar Galactica's James Callis, fresh off his star turn in Picard Season 3. Rounding out the new additions are Ruth Bradley, who PBS viewers will know from Guilt, and the always-recognizable Tom Brooke, who has been in everything from Sherlock to Bodyguard to The Crown.

Season 3 will be based on Mick Herron's third novel in the Slow Horses series, Real Tigers, but without it having aired, it's hard to know how many, if any, of these new cast members are adding themselves to the Slough House team. Though the series cast has remained relatively stable, the show has proved it is not above killing off the occasional lead (RIP Min Harper). But with Apple keeping the casts' new roles under wraps for now, fans will have to wait and see the cause for their arrival.