Olivia Cooke reveals 'really bad' Slow Horses set injury after hearing a terrifying 'snap'

Olivia Cooke has opened up about suffering what she called a "really bad" injury while working on Slow Horses, revealing that she heard a disturbing "snap" during the incident. The 32-year-old actor discussed the mishap as she returned to the Apple TV spy drama in the role of MI5 agent Sidonie Baker. Cooke's comeback carries an added twist for viewers because Sidonie appeared to have died after being shot in the head during the first season. The character had also developed chemistry with River Cartwright, played by Jack Lowden. According to the source, Sidonie's unexpected reappearance is not simply a television invention: her return also takes place in Mick Herron's novels, on which the series is based. Speaking to Variety, Cooke looked back at the uncertain circumstances surrounding the programme's beginnings. She recalled that the first season was filmed towards the end of 2020 and was one of the earliest productions to resume work after lockdown. At that point, she said, there were already "whispers" that Sidonie might ultimately return, although Cooke was unsure whether the relevant book revealing that development had yet been released. The actor said the atmosphere at the time was uncertain, not only because of the wider circumstances but because Slow Horses itself was still on its first series. Years later, the character has now made the dramatic comeback that had once existed only as a possibility around the production. That return has put Cooke back at the centre of the spy series, but her account also reveals that filming came with a painful setback. The source describes her injury as serious enough for Cooke herself to label it "really bad," with the sound of a snap making the moment especially alarming. Her revelation adds an uncomfortable behind-the-scenes detail to a comeback that was already designed to surprise viewers.