"Slow Horses" Season 2, Episode 6, "Old Scores," acts as the high-stakes finale to the "Dead Lions" storyline, resolving the Russian "Cicada" sleeper agent mystery and the plot against Jackson Lamb. The episode follows the team as they stop a terrorist threat and a digital heist, with critical praise for the resolution and performances. For more information, visit Slow Horses Wiki . "Slow Horses" Old Scores (TV Episode 2022) - IMDb