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Olivia Cooke Makes a Surprise Return in the Trailer for Slow Horses Season 6

bekir August 18, 2026 3 min read 1 views

===SLOW HORSES RIDES AGAIN: Olivia Cooke Returns to MI5 in Season 6 Trailer!===

[Gary Oldman as Jackson Lamb delivers a scathing remark in the Slow Horses Season 6 trailer.]

Get ready for more espionage shenanigans! Apple TV+ just dropped the first trailer for Slow Horses Season 6, and it’s packed with twists, turns, and the shocking return of a fan-favorite character. Buckle up, because Sidonie Baker, played by the incredible Olivia Cooke (yes, the one from House of the Dragon!), is back in the game.

[Kristin Scott Thomas as Diana Taverner engages in a tense conversation with Gary Oldman’s Jackson Lamb.]

For those who don’t remember, Cooke’s Sidonie had a memorable but brief appearance in the first season, which premiered way back in April 2022. Her departure was… well, let’s just say it left viewers wanting more. Longtime fans of Mick Herron’s Slough House novels knew that closure for Sidonie was coming, and now, after years of speculation and fervent online petitions, the wait is finally over!

The new trailer kicks off with a classic scene: Jackson Lamb (Gary Oldman), the perpetually grumpy head of Slough House, MI5’s dumping ground for disgraced agents, trading barbs with Diana Taverner (Kristin Scott Thomas), the current head of MI5. It seems our “slow horses” are about to become prime targets, and Lamb is desperately trying to keep his ragtag team – both current residents and alumni – from getting themselves killed.

[Jack Lowden as River Cartwright confronts Hugo Weaving’s Frank Harkness in a tense standoff.]

But that’s not all! The trailer also teases the return of Louisa Guy (Rosalind Eleazar), who had previously vowed to leave the spy game for good at the start of Season 5. And, of course, we can expect another showdown between River Cartwright (Jack Lowden) and his utterly loathsome father, Frank Harkness (a particularly chilling performance by Hugo Weaving). Could this be the moment River finally breaks free from his father’s shadow?

[Olivia Cooke as Sidonie Baker makes a surprise appearance in the Slow Horses Season 6 trailer.]

And then… BAM! Olivia Cooke bursts onto the screen as Sidonie Baker, and the internet collectively gasped. What role will she play this time around? Will she be an ally or another complication for Jackson Lamb and his team? Only time will tell.

The trailer is a masterclass in suspense, perfectly capturing the dark humor and gritty realism that have made Slow Horses such a hit. It’s clear that Season 6 is going to be bigger, bolder, and even more dangerous than ever before.

[A montage of action sequences from Slow Horses Season 6.]

Slow Horses has become a yearly tradition on Apple TV+, with each season delivering fresh intrigue and compelling characters. This time around, the show will adapt not one, but two books from Mick Herron’s acclaimed series: Joe Country and Slough House. And for those already counting down the days, rest assured that Season 7 has already been greenlit!

Don’t miss the premiere of Slow Horses Season 6 on September 16th, exclusively on Apple TV+. New episodes will be released weekly. Get ready to dive back into the world of espionage, betrayal, and slow horses who are anything but slow when it comes to uncovering the truth.

Source: IGN Gaming

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