Apple TV+ has released the first full trailer for Slow Horses season 5, and it sets up another tense chapter for the team of disgraced MI5 operatives at Slough House. The series, led by Gary Oldman as the disheveled Jackson Lamb and Jack Lowden as River Cartwright, has built a reputation as one of the platform’s strongest dramas, balancing espionage thrills with dark humor.
The new season, arriving September 24, wastes no time in raising the stakes. Following a deadly attack that leaves 11 people dead, Slough House is forced into lockdown. From there, the trailer hints at a race against time as the agents attempt to contain an escalating threat, one that appears to reach far beyond their usually grim but small-scale cases.
Joining the returning cast is Hannah Waddingham, best known for her Emmy-winning role in Ted Lasso. Her appearance adds a fresh layer of intrigue, and her presence in the trailer suggests she may play a significant role in the unfolding crisis. While the exact nature of her character remains under wraps, her inclusion underscores Apple’s investment in keeping the ensemble both dynamic and unpredictable.
The trailer also teases a broader scope for the series. Where earlier seasons often focused on tightly contained operations and the personal failings of its characters, season 5 appears to widen its lens to national security at large, hinting at sinister forces pulling strings behind the attack. For a show that thrives on political murk and the incompetence of bureaucracy, this escalation feels like a natural progression.
With a sixth season already confirmed, Apple TV+ is signaling continued confidence in Slow Horses. Its mix of sharp writing, strong performances, and a willingness to portray espionage work as messy and often pathetic has set it apart from glossier spy dramas. Season 5 looks to push those strengths further while raising questions about just how much chaos Jackson Lamb and his outcasts can endure before the system breaks them completely.
