Apple TV’s Best Spy Thriller Is Resurrecting a Fan-Favorite Character in Its Most Explosive Season Yet

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Apple TV’s Best Spy Thriller Is Resurrecting a Fan-Favorite Character in Its Most Explosive Season Yet

Through its first five seasons, it’s been clear that Apple TV’s Slow Horses refuses to rest on its laurels, with each new installment even twistier and more shocking than the last. Whether we’ve had to mourn several beloved Slough House agents or gasp at the way their thrilling adventures unfold, the spy drama never fails to keep us on the edge of our seats. Now, with a Season 6 trailer that dropped this week, Slow Horses is demonstrating through one character’s return that it has no intention of playing it safe.

‘Slow Horses’ New Trailer Reveals the Return of a Season 1 Fan-Favorite

The protagonist of Slow Horses is River Cartwright (Jack Lowden), an agent relegated to MI5’s Slough House because of a disastrous training exercise. In Season 1, he meets Sidonie Baker (Olivia Cooke), another Slough House agent who helps to uncover clues about the kidnapping of a student by extremists. In Episode 2, River decides to follow a lead, and Sid tags along. She ends up confessing to River that the only reason she’s at Slough House is to keep an eye on him, and she received that assignment from MI5 boss herself, Diana Taverner (Kristin Scott Thomas). Before she can explain further, Sid is shot in the head by a masked man. River later visits a comatose Sid in the hospital, clearly feeling guilty that he got her mixed up in a more dangerous plot. Later in the season, Taverner tells Jackson Lamb (Gary Oldman) that Sid has died, but we never actually see her death or her body, or even get true confirmation that she’s gone. In fact, we learn that all information about Sid has been completely erased from MI5’s servers — almost as if she never existed in the first place.

Several seasons of Slow Horses have passed, and even though Sid hasn’t resurfaced, many viewers have wondered if she could still be alive. The trailer for Season 6 reveals that the agents of Slough House are being hunted. After Lamb makes a snarky comment about how all spies have “faked their deaths at one time or another,” the trailer jumps to River walking up a stairway where none other than Sid, looking very alive and well, is standing at the top. She greets River, and the clear shock of her presence registers on his face. Anyone who has read the book series by Mick Herron knows that Sid would likely return, but for most viewers, her reappearance is wildly surprising.

‘Slow Horses’ Season 6 Is Sure To Be a Twisty Thrill Ride

Previously, it was announced that Season 6 would adapt two of Herron’s novels, promising even more drama over just six episodes. With the intriguing premise of the Slough House agents, both past and present, being hunted and executed, this puts all of our favorite characters in danger, including Louisa (Rosalind Eleazar), who is also back this season. What seems most thrilling is what else the show could have in store. If Apple TV was willing to put such a gigantic shocker as Sid’s return in the Season 6 trailer, it certainly seems like there will be even bigger twists and turns to come. Frank Harkness (Hugo Weaving), River’s father, also pops up in the sneak peek, which already guarantees a lot more chaos. Who knows which other characters will return, or how the Slow Horses will actually get themselves out of the danger they’re in?

Because Season 6 doesn’t drop until next month, there’s plenty of time for fans to rewatch and jog their memories about Sid’s role in the Slough House drama, as well as all the trials and tribulations the agents have gone through. One thing is certain: seeing the brilliant Cooke (currently slaying on HBO’s House of the Dragon) back on Slow Horses is an exciting prospect, and Season 6 is already looking like a fantastic reentry into Apple TV’s spy world.

Seasons 1-5 of Slow Horses are available to stream on Apple TV in the U.S., with Season 6 set to premiere September 16.