19) Spooks – “Smoke and Mirrors” (2003)

In the season 2 finale of Spooks, "Smoke and Mirrors," the cliffhanger leaves audiences reeling due to tense events. The MI5 team's trust is shattered when a significant betrayal occurs within the ranks, leading to the assassination of one of the key team members. The episode ends on a shocking note, leaving the identities of the traitors unclear and the stakes, impossibly high. The show's intense and morally complex nature made the cliffhanger particularly gripping, with its consequences rippling through the following seasons and continuously challenging the idea of loyalty within the spy world.
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