1第 1 集

在Abu Fayed发动恐怖袭击的四年后，CTU被政府解散了。Jack Bauer在参议员Mayer所主审的参议听证会上被称使用了酷刑等非法手段来防止恐怖袭击。FBI在首席安全工程师Michele Latham被绑架后知道他们要入侵国家基础设施计算机。因为Jack曾与本次行动的策划者之一的Tony Almeida共事过，被传唤并要求他参与帮助这次的调查。而Latham被迫要给恐怖分子修理CIP装置。Jack和Renee审问一个和Tony有关的中间商时，那人被狙击手杀害了。

2第 2 集

为了表明修补好的CIP装置可以进入国家电脑系统，Tony对航空中心实行了控制。总统Taylor和首相Matobo对派兵援助Sangala而进行磋商，第一先生Henry寻找与他儿子死因有关的线索。其间，一个FBI中的内奸帮助那名狙击狙击手逃脱了追捕。Jack和Walker探员跟踪着那个狙击手到快艇上，在那里逮捕了Tony。然而，CIP装置在此前被转到了Emerson一帮人的手中。

3第 3 集

当Tony被FBI审问时，他暗中给Jack一个联系Bill Buchanan的电话。Bill Buchanan后证明Tony是卧底。他们和Chloe一起试图阻止一场涉及CIP装置在内的政府阴谋。Henry和他儿子的前女友Samatha见面。Colonel Dubaku拿到了CIP装置，威胁美国政府从Sangala撤军。为了让Tony继续做卧底,Jack在Chloe和Bill帮助下解除了Renee的武装，让Tony从FBI的手中逃跑。

4第 4 集

Buchanan takes Jack to "CTU", a secret hideout where he and Chloe had been working with Tony to uncover the conspiracy within the US government. Tony had been undercover with the terrorists aiding Juma to discover the moles. Jack agrees to help get Tony back in play by joining Emerson's crew himself. Taylor is forced to meet with Matobo to inform him that she may be required to withdraw her forces from Sangala to protect American lives. Her Chief of Staff Ethan Kanin agrees with this decision, but Taylor is not yet convinced. Henry meets with Samantha, Roger's former girlfriend, who tells him that Roger was indeed murdered and provides him with proof.

5第 5 集

As the threat of terrorism escalates, Jack Bauer is forced to take matters into his own hands to avert the imminent crisis facing the country. Meanwhile, lives are on the line as conflicted Agent Renee Walker copes with the volatile investigation, and FBI honcho Larry Moss is forced to keep a closer eye on his team as the nation's security is in jeopardy. At the White House, international stakes are raised and the First Gentleman proceeds with his personal mission.

6第 6 集

As Dubaku presses President Taylor to comply with his devilish demands, she contemplates if the administration should negotiate to avert a disastrous terror attack. Meanwhile, away from the White House and the threatening international crisis, the determined First Gentleman struggles with his ongoing domestic mission, and perilous FBI Agent Walker diverts the attention of her tense colleagues. With national security on the line, Jack Bauer has a formidable plan in hopes of shielding the country in the “Day 7: 1:00-2:00 PM” episode.

7第 7 集

As U.S. troops remain in position outside of Sangala, Dubaku seeks another high-value target using the CIP module. While the entire NSA scrambles to locate the breach, the situation rapidly escalates. Paranoid FBI Agent Janis Gold commands from her post, while Jack, Tony, Renee, Chloe and Buchanan follow leads.

8第 8 集

As the country reels from the recent terror attacks and faces the mounting global ramifications, the administration refuses to acquiesce and presses on with their disapproval of the Juma regime. As Jack Bauer and team head to the White House for a pivotal meeting with President Taylor, Dubaku raises the stakes when he threatens the First Family

9第 9 集

After eight hellacious hours of this terrible day have elapsed, the country remains on edge. President Taylor struggles with the painful circumstances facing the First Family, including her daughter Olivia (guest star Sprague Grayden). Meanwhile, a huffy Chloe faces-off against paranoid FBI Agent Janis Gold, while Jack and Agent Walker track leads through Washington, D.C. to eliminate the threat of another ruthless terror attack

10第 10 集

Jack and Renee Walker pursue Dubaku through the streets of Washington, D.C., with a little cyber help from Chloe. Meanwhile, the first family and the FBI are left reeling from incidents involving turncoat agents.