Season 7, Episode 8: Season Finale
With tensions between America and Russia at an all-time high, the team discovers that Britain is being used as a pawn in an international game of chess. Intelligence brought back from Moscow by Lucas reveals that Russia is planning an attack on London (codenamed Tiresias) and that it is scheduled to take place today. Tiresias is a network of silent saboteurs who have infiltrated all areas of British governance. Tiresias has a sole purpose: to cripple the United Kingdom when activated.