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A high-octane Fox thriller that premiered November 2001, starring Kiefer Sutherland as CTU (Counter-Terrorism Unit) agent Jack Bauer. Each season depicts a single continuous 24-hour day with one episode per hour, complete with a ticking on-screen clock and split-screen "meanwhile" shots. The show's relentless pacing, cliffhangers, and post-9/11-era terrorism plots made it a cultural phenomenon that redefined the thriller format for television.