Slow Horses Season 6 brings its biggest shock yet as Sid Baker returns alive while Jackson Lamb's agents become targets in a deadly revenge hunt.
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Current and former Slough House agents are being killed, forcing Lamb to uncover who is behind the attacks before a member of his team dies.
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Olivia Cooke returns as Sid Baker for the first time since Season 1, shocking River Cartwright and reopening one of the show's oldest unanswered mysteries.
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With killers closing in, Lamb orders the agents to disappear, avoid phones, and stay hidden while the team searches for answers behind the deadly attacks.
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Frank Harkness, Louisa Guy, and Moira Tregorian appear again as the crisis grows, while the trailer keeps the identity of the attackers hidden from viewers.
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Slow Horses Season 6 premieres September 16, 2026, on Apple TV with six weekly episodes, ending with the finale on October 21 for viewers worldwide.
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Want every Sid Baker clue, returning character, trailer moment, book connection, and release detail? Read the full article for the Slow Horses Season 6 breakdown.
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