Slow Horses Brings Back Olivia Cooke's Sid Baker in Season 6
Olivia Cooke's Sid Baker, shot in the head in season 1, returns in Slow Horses season 6, episode 2 — and reveals who planted her at Slough House.
Slow Horses has brought back a character fans long assumed was gone for good. Olivia Cooke's Sid Baker resurfaced at the end of season 6, episode 2, an installment titled "Daddy Issues."
Sid's return closes a loop that began early in the Apple TV+ series, which premiered in 2022. She was shot in the head in the show's second episode, leaving her fate uncertain for years.
Her comeback comes with a revelation: Sid admitted she had been planted at Slough House by Diana Taverner to spy on River Cartwright. The confession reframes her earlier time alongside Gary Oldman's Jackson Lamb and the rest of the Slough House team.
The episode also ties into River's personal history, with his father identified as Frank Harkness. As reported by Screen Rant, the hour pairs Sid's reappearance with that family thread.
What Sid's Return Means
Sid's admission that she was working for Taverner adds a new layer to her relationship with River, whose loyalties have been tested repeatedly across the series. Her reappearance also revives a thread left dangling since season 1.
Quick answers
Does Sid Baker return in Slow Horses?
Yes. Olivia Cooke's Sid Baker returns at the end of Slow Horses season 6, episode 2, titled "Daddy Issues."
What happened to Sid Baker in Slow Horses?
Sid was shot in the head in the show's second episode. She later admitted she had been planted at Slough House by Diana Taverner to spy on River Cartwright.
Who plays Sid Baker in Slow Horses?
Olivia Cooke plays Sid Baker.