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Reviewers on IMDb praised the episode's "masterful build-up of suspense" and the kinetic energy provided by the cinematography.

Their relationship hits its lowest point following the death of Audrey's husband, Paul Raines . Audrey blames Jack for forcing a doctor to prioritize a terrorist suspect's surgery over Paul's, and she tells Jack she cannot be near him. Watch 24 4x21 1

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. Reviewers on IMDb praised the episode's "masterful build-up

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

Habib Marwan has an actual nuclear missile, not just a portable warhead Day 4: 3:00am-4:00am - Wiki 24 | Fandom