Olivia Cooke on Returning to ‘Slow Horses,’ On-Set Injuries and That Shocking Finale Cliffhanger: ‘I Want a Showdown!’

By Alison Herman

Alison Herman

TV Critic

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SPOILER ALERT: The following article contains plot details from “Judgement Day,” the Season 6 finale of “Slow Horses,” now streaming on Apple TV.

“Hello, River.”

Those two fateful words announced Olivia Cooke’s return to “Slow Horses” after a four-season absence from the Apple TV spy drama. Cooke’s MI5 agent Sidonie Baker made a brief but memorable appearance in Season 1, forging a flirty chemistry with inept spy River Cartwright (Jack Lowden) before dying from a gunshot wound to the head — or so River thinks.

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