Warning: Contains MAJOR SPOILERS for Slow Horses, seasons 1, 2, and 3Since its debut in 2022, Slow Horses has been widely acclaimed as one of the best spy-thrillers on TV, with all 18 episodes receiving plaudits. Given the consistent quality and pace of the storytelling, ranking all Slow Horses episodes is far less straightforward than it is for other series that might suffer a dip from season to season. Nevertheless, while every Slow Horses episode has its merits, some still stand up better than others.