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Slow Horses season 6: MI5’s misfits face a killer who isn’t their own incompetence

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  • September 21, 2026
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Slow Horses season 6: MI5’s misfits face a killer who isn’t their own incompetence

Apple TV’s espionage comedy is back for Season 6, and Slough House is as gloriously dysfunctional as ever.

No collection of blundering intelligence operatives on television is quite as magnificently useless as the residents of Slough House. Over five seasons, Jackson Lamb, River Cartwright and the rest of MI5’s human refuse pile have survived bombings, kidnappings, botched extractions, terrorist plots, Russian skulduggery, rogue agents, internal coups and political cover-ups.

Yet six seasons in, almost nothing has changed — and that’s a compliment. Slough House is still populated by its spectacular clown car of disgraced spies, except the bodies turning up around them this season suggest their latest disaster might actually have nothing to do with their own incompetence.

For once, somebody other than the Slow Horses may be trying to kill the Slow Horses.Season 6 opens with David Cartwright dead and River (Jack Lowden) preparing for his funeral. Slough House gets no time to process before the bodies start piling up.

When Struan Loy, the incompetent sad sack Lamb (Gary Oldman) fired back in Season 1, is the first to turn up dead, they soon realise his death is connected to a series of killings targeting former Slow Horses.

Two assassins, played by Kyle Soller and MyAnna Buring, are working their way through the old personnel, while MI5 has quietly scrubbed the victims — and the entirety of the existing Slough House — from its records.