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In the 21st episode of Season 4, titled "Day 4: 3:00 a.m. – 4:00 a.m.," the tension reaches a breaking point as the domestic threat of a nuclear launch converges with a major international diplomatic crisis. Plot Summary: Domestic and International Crises

This episode marks the first appearance of Cheng Zhi (played by Tzi Ma), who becomes one of Jack's longest-running and most significant adversaries throughout the series. Watch 24 4x21 1

The sight of a nuclear missile launching on American soil remains one of the most iconic and high-stakes moments in the show's history. Air Date May 9, 2005 Director Bryan Spicer Key Death Paul Raines (confirmed dead at the start of the hour) Major Reveal In the 21st episode of Season 4, titled "Day 4: 3:00 a

The two continue to manage the tactical operations at CTU, with Michelle struggling to balance the professional necessity of the mission against the personal tragedy involving Paul and Audrey. Critical and Fan Reception The sight of a nuclear missile launching on

Critics and viewers often highlight this episode for its relentless pacing and high-stakes "cliffhanger" ending.