The Slow Horses season 6 trailer is here, and it ends on a face the show has not used since 2022: Olivia Cooke as Sid Baker. The six-episode season premieres 16 September on Apple TV.
The trailer opens with Jackson Lamb (Gary Oldman) in Diana Taverner’s garden, asking why his people keep turning up dead (Deadline). Someone is targeting anyone who has ever worked at Slough House, and Lamb’s orders are short:
“I cannot emphasize this enough: Stay dark. No phones.”
Jackson Lamb, in the Slow Horses season 6 trailer
The instruction does not survive contact with Roddy Ho, who is shown on the phone to Lamb moments later.
Warning! Spoilers for Slow Horses follow…
What the Slow Horses season 6 trailer shows
Lamb has an explanation for the surprise, delivered to Catherine Standish before the trailer’s final beat:
“We’re spies. We’ve all faked our own death at one time or another.”
Jackson Lamb, in the Slow Horses season 6 trailer
Sid Baker was shot in the head at the end of season 1 and has been presumed dead since. She is last seen greeting River Cartwright (Jack Lowden) at the top of a flight of stairs. “Hello River.”
When does Slow Horses season 6 premiere?
Season 6 adapts Joe Country and Slough House, the sixth and seventh novels in Mick Herron’s series — two books in six episodes. The regulars are back, Hugo Weaving returns as River’s father Frank Harkness, and Lenny Rush joins the cast. The earlier announcement confirmed the season sees the Slow Horses on the run as Taverner embroils them in a game of retaliation and revenge.
It premieres Wednesday 16 September, one episode a week until the finale on 21 October. Season 5 collected nine Primetime Emmy nominations, including drama series, part of Apple TV’s 2026 nominations run. All five earlier seasons are streaming on Apple TV now, and UAE viewers get each episode the same day as the global release.
When does Slow Horses season 6 premiere?
Wednesday 16 September 2026, with the first episode. New episodes follow weekly until the finale on 21 October.
Who is Sid Baker in Slow Horses?
Sidonie “Sid” Baker is an MI5 agent and River Cartwright’s former partner and love interest. She was shot in the head at the end of season 1 and presumed dead; Olivia Cooke reprises the role in season 6.
Where can I watch Slow Horses in the UAE?
On Apple TV, which is available in the UAE. All five earlier seasons are streaming now, and season 6 episodes arrive weekly from 16 September, the same day as the global release.
