Apple TV releases the trailer for “Slow Horses” Season 6, setting up a new cycle of danger for Jackson Lamb’s Slough House team. Multiple outlets report that the Slough House members are hunted and forced to go underground as an unseen opponent targets the crew. Gary Oldman returns as Lamb, warning the team to stay dark and move into a more covert posture.
The trailer also points to major continuity beats. Deadline and Variety both say Olivia Cooke returns as a familiar character, described as making a surprise comeback. Metro similarly frames the update around Cooke’s long-awaited return. Across reports, the show’s escalation appears tied to a high-stakes retaliation and revenge dynamic involving Diana Taverner (Kristin Scott Thomas), creating a broader context for why the hunt begins and how the team’s situation changes.
