Olivia Cooke Returns for Slow Horses Season 8, and Says It Is the Last
Olivia Cooke is coming back for Slow Horses Season 8, and she has called it the show's last season. Speaking to The Times, she said "I am shooting the last season!" Deadline reported her comments on 15 November 2026.
Cooke first appeared in the Apple TV spy drama as MI5 agent Sidonie "Sid" Baker, in a three-episode arc in Season 1. She reprised the role in Season 6. Her return for the next series means a familiar face is back for the show's final run.
She did not close the door completely. Cooke added "never say never" when asked about the future of the series. She also said Season 8 feels like the show is ending.
No official decision on a season beyond Season 8 has been announced. That leaves the show's long-term future open, with no date or plan given for anything after the next run.
The renewal history is worth knowing. Apple gave Slow Horses an early renewal for Season 8 in September, a day before the Season 6 premiere. A renewal is a platform's order for another season, and an early one means the decision came before the current run had finished airing. Season 7 had already been ordered before that.
Season 8 will adapt Mick Herron's novel Clown Town, the ninth book in his Slough House series. The books follow a team of spies who have been pushed aside, and the show is built on them. Herron's novels are the source material for every season.
For viewers, the immediate news is simple. Cooke is returning, and the series has a set number of seasons ahead of it, with Season 8 the one currently confirmed.
