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Habib Marwan accelerates his timeline after realizing CTU has upgraded its technical defenses, making it harder for him to jam their satellite tracking. By the end of the hour, Jack Bauer and Curtis Manning track Marwan to a factory. Despite a fierce gun battle, they arrive seconds too late to stop the launch sequence; the episode ends with the team helplessly watching as a nuclear missile is fired toward an unknown target.

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 Habib Marwan accelerates his timeline after realizing CTU

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

The episode centers on two parallel conflicts: the physical hunt for terrorist leader and the political fallout from a raid on the Chinese Consulate .