Ep 20. Day 4: 2:00 A.M.-3:00 A.M

Day 4: 2:00 A.M.-3:00 A.M. is the twentieth episode of the fourth season of the hit television series 24. As the title suggests, the events of the episode take place between the hours of 2:00 A.M. and 3:00 A.M. on Day Four of Jack Bauer's fight against terrorism.

The episode opens with the CTU (Counter-Terrorist Unit) team determined to track down the terrorist mastermind Habib Marwan, who has been using a network of sleeper cells across the United States to carry out his attacks. Jack Bauer leads the team, but his personal connection to Marwan – who was responsible for the death of Jack's lover, Audrey's husband – threatens to cloud his judgment.

Meanwhile, President John Keeler is still reeling from a devastating attack on Air Force One, which left him gravely injured and his Vice President the acting Commander-in-Chief. When the Vice President's policy of aggressively targeting known terrorist locations in the Middle East leads to another deadly retaliation on American soil, Keeler begins to reconsider his options.

As tensions rise, Bauer and his team gain a critical lead on Marwan's whereabouts. They discover that he is hiding in a train underbelly somewhere in Los Angeles, and quickly mobilize to intercept him. But Marwan's sleeper cells are always a step ahead, and the CTU team soon finds themselves battling their way through a maze of traps and ambushes.

In addition to this tense action, the episode also delves deep into the personal lives of several characters. Audrey begins to realize that her own loyalty to Jack may be blinding her to his increasingly reckless behavior. President Keeler's daughter, who has been kidnapped by Marwan's organization, receives a glimmer of hope when a surprising ally comes to her rescue. And CTU analyst Chloe O'Brian takes matters into her own hands when her boyfriend's life is put in danger by her coworkers' mistakes.

Ultimately, all of these threads come together in a heartbreaking final scene that sets the stage for the dramatic conclusion of the fourth season. The episode is a thrilling ride from start to finish, packed with pulse-pounding action, emotionally resonant character moments, and surprising plot twists.