Set in New York City, Jack Bauer is unwillingly drawn back into action just as President Allison Taylor negotiates international security with Omar Hassan, a determined Middle Eastern leader visiting the U.S. on a peacemaking mission. As the new day unfolds, an upgraded CTU operates under the command of M.B.A.-schooled, razor-sharp head honcho Brian Hastings, who supervises quirky Chloe O'Brian, expert data analyst Dana Walsh and systems analyst Arlo Glass. Written by FOX Publicity

CTU detains a reporter it suspects of helping assassins, while Jack and Chloe start their own investigation.

Chloe and Jack continue to look for the person that planted documents on Meredith's laptop. Close to the target, Jack gets tased by a cop who thinks Jack killed his colleague. Dana is visited at the CTU by an old boyfriend and is scared that he'll expose her deep dark secret. Jack is beaten up by a mad cop while the real perpetrator goes on with his plan of assassinating president Hassan. Hastings takes false intel as evidence and makes a bad leadership decision. Written by Andreea D

CTU wants ex-FBI agent, Renee Walker, to infiltrate a Russian gang which is selling weapons-grade enriched uranium to the assassination plotters.

Four explosive hours after being unwillingly drawn back into action, Jack Bauer re teams with a risky Renee Walker to track some very dangerous leads. Meanwhile, back at CTU, a desperate Dana Walsh faces tense and untimely circumstances when her ex-con boyfriend from her home in Texas shows up and threatens to reveal her past life to her employers unless she does some things for him. Elsewhere, emotions escalate when President Taylor learns of a larger looming threat that jeopardizes the peace accord with President Hassan. Also, Sergi Bazhaev, the Russian arms dealer, agrees to let his son, Josef, try to get medical treatment for his other son whom has radiation poisoning. Written by FOX Publicity

Undercover Agent Renee Walker confronts her painful past when attempting to broker a deal with a ruthless, but very well-connected German arms dealer. When CTU shifts its focus from the perilous circumstances surrounding Jack and Renee, lead analyst Dana Walsh comes up with a plan to quell her situation and Chloe O'Brian puts Arlo Glass in his place. As Jack and Renee's undercover mission takes unexpected turns, the Hassan family turmoil has President Taylor reeling as the peace agreement is jeopardized. Written by FOX Publicity

Despite averting the assassination attempt on peacekeeping leader Omar Hassan, Jack Bauer's day intensifies when he is forced to go deeper undercover to secure the unsecured enriched nuclear materials. As international delegates reconvene at the United Nations, President Taylor's goodwill comes into question and CTU races against time to assist with the mission. Written by Fox Publicity

While nuclear materials are en route to Kamistanis attempting a coup, Kayla confronts her father, Dana makes a decision, and Jack endures torture.

The White House wants a fall guy, Jack tries to protect that person, Dana goes after her ex, Cole follows her, and CTU gets help from an unlikely source.

As the terror threat continues, the Hassan family turmoil fans the flames of the increasingly urgent situation. When Jack closes in on a person of significant interest, an already tense meeting between President Taylor and Omar Hassan takes an unexpected turn. Written by Fox Publicity

A mother wants to save her son, an estranged couple reconnects to look for their daughter, and Jack races against the clock to dissuade a suicide bomber.

Nuclear fuel rods await transport into Manhattan, Jack pursues a lead to a hotel, Kayla is in danger, and a Southern probation officer wants information from Dana.

As the imminent terror threat nears and CTU copes with the day's explosive events, the onerous NSA intervenes. Conditions at CTU remain tenuous and field operatives find intense action when Jack Bauer leads them on a risky mission. Meanwhile, Chloe and Dana make game-changing moves. Written by Fox Publicity

Kamistani rebels give President Taylor an hour to turn over Hassan, sedition strikes Taylor's administration, CTU harbors a traitor, and Jack walks into an ambush.

As dawn breaks over New York, President Taylor endures a game-changing setback as the threat of mass destruction looms. Meanwhile, President Hassan makes a shocking decision that surprises his loved ones. But before long, trusted confidantes will become enemies of the state, and it's only the beginning of the betrayals that are to come as the race against time ticks on. Written by FOX Publicity

A traitor makes a deal for immunity, while Jack and Renee race uptown to rescue a hostage.

As the country reels from the day's devastating events, stalwart President Taylor attempts to resuscitate the peace agreement, the cornerstone of her administration. Much to her dismay, she is forced to solicit the services of disgraced former President Logan. Meanwhile, Jack Bauer makes an unprecedented emotional move that triggers the unthinkable, and back at CTU, Chloe is charged with new responsibilities. Written by Fox Publicity

With only seven hours left in the series' final harrowing day, Jack Bauer sets out to avenge the tragic life-changing events that he has endured. As things become even more personal for Jack, he heads to CTU for an intense meeting after learning of a devastating development. Meanwhile, on the verge of achieving peace on a scale that has eluded the world for generations, President Taylor becomes deeply conflicted when former President Logan sits down at the bargaining table. Written by FOX Publicity