Jack takes his fight directly to the President as he attempts to force a confession from him that will prove his involvement in the day's events. Martha vents her hatred for her husband in front of the press as Logan gives a eulogy over Palmer's body. Jack and Audrey share a tender moment when it seems the crisis has subsided, but Jack finds that his problems have only begun as his past catches up with him.

As the missile speeds toward its destination, Mandy cuts a deal with Jack and the President to give up Marwan's location in exchange for a full pardon on all of her crimes. Tony and Michelle share a happy reunion, but Jack finds his relationship with Audrey shattered as she makes her feelings known. Logan's advisor suggests a drastic course of action when the Chinese government demands that Jack be handed over to them for trial. Palmer tries desperately to warn Jack of the danger against him. Jack's life changes forever as Tony, Michelle and Chloe help him to evade the trap set for him by Secret Service.

Emotions run high as the harrowing day climaxes with resolute President Taylor closing in on a world-changing peace treaty and a vengeful Jack Bauer taking matters into his own hands for one last and unforgettable job.

When Jack arrives at Drazen's location, he calls and asks to speak to Kim. Andre angrily refuses and says that they known Palmer is not really dead. Stunned, Jack hangs up and immediately calls Nina to tell her there's still a traitor inside CTU. Momentarily uncertain how to proceed, Jack is suddenly shocked into action when Nina calls back with tragic news.

Palmer, Mike and Lynne discuss various ways to dispose of the ticking bomb. They conclude that the desert is the best place to set it off. Jack determines that one man must pilot the plane carrying the bomb. He chooses to fly the plane himself and bids a tearful goodbye to his daughter. Tony and Michelle become suspicious of a Middle Eastern diplomat who is asking questions about the evidence against Syed Ali. Palmer departs for Los Angeles so he can be on hand when news of the nuclear bomb reaches the public.

The Russian and US Presidents are set to sign an anti-terror treaty when assassinations rock Los Angeles, a call from a distressed Chloe forces Jack into action and President Logan's wife believes there may be a conspiracy.

The clock ticks toward the final seconds of Jack Bauer's most heroic day. As the world teeters on a terror plot of mass proportions, Jack and the team reunite one last time to avert an imminent international crisis. With little time left and the fate of the free world on the line, Jack is faced with an unthinkable and grave decision. Lives will be lost and the American administration will grapple with the day's most devastating news as the clock stops.

Jack and Sherry Palmer prepare for a dangerous meeting with the head of the war conspiracy at the L.A. Coliseum; David Palmer sits in as the Cabinet waits for confirmation of the Cypress Chip's invalidity; the air strike on the Middle East draws nearer; the conspiracy goes to an old agent to put Palmer out of play.

Jack Bauer and President Heller endure the unthinkable to thwart the terror attacks of mastermind Margot Al-Harazi. Meanwhile, CIA agent Jordan Reed faces a life-or-death struggle and Kate takes drastic measures to track down Margot before it's too late.

Jack and Chase must make a powerful sacrifice when dealing with the virus. Tony is able to help Jack one last time before he is taken into custody, while an angry victim seeks vengeance on Saunders. Palmer makes a surprising career choice in the wake of Sherry's death.

Chloe is unexpectedly thrust into fieldwork when a woman reports that her boyfriend may be part of the terrorist conspiracy. Jack and Curtis find their latest efforts to trap Marwan thwarted by the Secret Service, who have orders to arrest Jack for insubordination. Mike calls on ex-President David Palmer for help as Logan continues to display a lack of leadership.

Jack and Chase race against time to capture Saunders before the deadline, while Chappelle plans an escape. Michelle begins a frantic search when she learns that an infected hotel guest may have slipped through her fingers.

As the clock ticks toward the climactic series finale, three hours remain and a ruthless Jack Bauer is on an unwavering mission to uncover the truth, which only complicates circumstances for President Taylor as she prepares for a signing ceremony. Meanwhile, President Logan comes face-to-face with a formidable foe, and Chloe leads CTU on a high-stakes collision course with Jack Bauer.

Jack and Chloe are on the trail of a hacker who might lead them to whoever is behind an assassination attempt on President Heller... but Kate is hot on Jack's trail.

The terror threat escalates as Jack heads for the U.S. Embassy with the CIA closing in on him. Meanwhile, Margot asserts her authority with unthinkable force; President Heller makes an impassioned speech to Parliament; and Kate takes matters into her own hands.

After Logan authorizes Palmer to take charge of the crisis, Palmer sanctions Jack and Curtis to infiltrate the Chinese Embassy on a covert operation to capture a suspect. Tony and Michelle continue to bump into each other's personal lives, while Buchanan expresses anger at being kept out of the mission. Jack faces Audrey's wrath when a medical dilemma places Paul's life in jeopardy.

Jack takes Henderson to CTU for questioning. Once there, he faces an unhappy reunion with his daughter, Kim. Mike appeals to Martha for help as Logan faces pressure from his Vice-President to declare martial law on L.A. Lynn connects the theft of his keycard to an impending strike on CTU, but his warning comes too late to stop a terrorist from infiltrating the building.

CTU raids Marwan's hideout, but he manages to slip through their fingers. Luckily, Jack locates a lead that may help him identify Marwan's next target. Tony becomes suspicious of Michelle's personal life, while Audrey reunites with Paul and learns the extent of his injuries. Anderson closes in on his quarry, as President Keeler searches for words that will comfort the American public.

Jack Bauer's harrowing day crescendos as he pursues final leads at all costs. The emotional toll of the day's events escalates when Kate Morgan learns the truth about her husband and Audrey confronts Boudreau about his duplicity. Making matters incredibly worse, the scope of the terror threat widens and the potential devastation reaches new heights.

Mandy uses Tony as leverage to try to force Michelle to aid in her escape. A Chinese security operative captures and interrogates one of the CTU agents involved in the raid on the embassy. Palmer and Logan argue over the option of evacuating all major cities that may be targets for the missile.

Presented with the evidence of Olivia's actions, President Allison Taylor is forced to make a decision between her family and the Presidency. Thanks to Kim Bauer, Janis, Renee and Chloe are able to save Jack and arrest Tony before he can kill Alan Wilson. With Wilson refusing to talk and Jack about to die, the fight is no longer in the field, it's for the hearts and souls of Jack and Renee.

After four years off the grid, Jack is apprehended in London by the CIA – on the very day that President James Heller arrives. As the President faces political pressure over a US drone program run from a UK-based base, only disgraced agent Kate Morgan suspects that Jack's capture was all too easy.

Emotions run high as the harrowing day climaxes with resolute President Taylor closing in on a world-changing peace treaty and a vengeful Jack Bauer taking matters into his own hands for one last and unforgettable job.

Jack and Henderson wage an assault on the submarine as Bierko prepares to launch an attack against L.A. Chloe brings in someone from her past to aid her. Martha and Aaron enlist Mike's help in their plans to expose Logan.

With Tony in custody, Jack leads his interrogation, but is shocked when a code word Tony whispers in his ear leads to old friends and a plot much deeper than anyone in the FBI anticipated. Jack once again takes the law into his own hands when he breaks Tony out of the FBI's custody to deliver him back to the terrorist faction. Renee asks FBI technician Janis Gold to try to uncover a possible leak in the agency, but Janis is terrified when her discoveries point to fellow analyst Sean Hillinger. Colonel Dubaku sends a message to President Taylor, insisting that the US withdraw its forces from Sangala or risk a terrible attack on their soil.

Jack and Tony clash as the time for the hostage exchange draws near. Keeler meets with Palmer and demands his resignation, while Wayne begins a secret operation against Sherry.

While Jack has problems with Curtis, CTU discovers a nuclear threat and raids a terrorist warehouse, and a shocking explosion shakes LA.

As the smoke clears after the devastating events of the first five hours, tensions between President Heller and Prime Minister Davies boil over, and one of them decides to take matters into his own hands. In the meantime, Jack proposes a plan to locate Margot by using someone unexpected as his unsuspecting bait. Back at the CIA in London, Jordan raises suspicions about Kate's husband.

The siege on the White House reaches an explosive end after Jack and Bill work together to try and save President Taylor. Meanwhile, Jonas Hodges makes moves to cover his own tracks, starting with Ryan Burnett.

Jack pushes the envelope in an attempt to force Saunders to disclose the location of the missing vials. Sherry meets with David to discuss her terms, while Wayne breaks into her home to find the incriminating evidence. Tony finds himself facing a harsh penalty because of his efforts to save Michelle.

Jack Bauer is forced to help Tony escape from custody, only to find Tony plans to use Jack to reconstitute the pathogen. Aaron Pierce and Ethan Kanin work together and discover Olivia's role in Hodges' murder. Kim Bauer takes down her captors, and works with Renee Walker to find her father.

Jack and Chloe have a plan in place to eliminate the terrorist threat before any more attacks rock London. With no time to spare and lives on the line, Jack and Kate pursue crucial leads in an attempt to gain the upper hand on the incredibly intense circumstances. Meanwhile, key players reveal their true colors. intense circumstances. Meanwhile, key players reveal their true colors.

An unlikely duo joins forces to forestall an impending attack. The terrorist reveals her demands. The President orders a military lockdown, but it may be too late.

Audrey pursues diplomatic channels to try to prevent a full-scale war. Meanwhile, Jack Bauer leads Kate Morgan and Mark Boudreau on a mission to locate their target before it's too late and the world is changed forever.

To find the remaining suitcase bombs, both Jack and the President set up bluffs.

Mike pushes for the Vice-President to be sworn into office as the White House waits for news of Keeler's fate. Two innocent bystanders are dragged into the fight as Jack and Marwan both pursue a briefcase that contains the launch codes for America's nuclear arsenal.

Juma and his men take the White House by storm, killing most of the Secret Service and trapping Taylor and Jack in the saferoom. His efforts to extract her are thwarted until he is informed that the President's daughter is in the White House as well. Renee and Larry try to convince Vice President Hayworth to let them rescue the President, but Hayworth will not budge until the FBI can produce proof that she is not in imminent danger.

CTU scrambles to forge an alibi when a Chinese representative produces evidence of American involvement in the raid on their embassy. Audrey gives Jack the cold shoulder, while Palmer and Logan clash over the consequences of Palmer's decisions. Jack and Curtis close in on Marwan as the countdown for the missile launch moves ahead.

Jack returns to CTU and has an emotional reunion with Audrey, while Curtis tracks the Russians and the stolen nerve gas. Walt sends in a hit man to silence Jack. Chloe discovers that Spencer has his own agenda at CTU. Walt convinces Logan to have Martha institutionalized when she tells them of the attack on her.

Jack and Chase track Amador in the hopes that he can lead them to the man behind the virus attack. Michelle faces a mob riot when the hotel is quarantined. Sherry extorts Palmer, forcing him to manufacture her alibi for the police.

Jack Bauer endures the elements and fights on to prevent an attack that could change the country forever. As the catastrophic blow to the nation nears, Tony Almeida operates from the field and Kim Bauer, who was last seen in Season Five, returns. Meanwhile, the stakes are raised when the administration is faced with a blackmail scenario.

After stowing away aboard the flight containing Henderson's contact and the incriminating recording, Jack finds himself having to deal with a pilot who refuses to cooperate. Martha begins to break down, and Mike becomes suspicious of what she is hiding from him, while Logan tries to calm his financial backers.

Jack shows Heller the incriminating recording in the hopes that he will help them take down Logan, but Heller has plans of his own that will save face for the presidency. Miles tricks Chloe into leading CTU to Jack and Audrey. Mike and Martha both become more suspicious of Logan's actions, while Heller confronts the president with an ultimatum.

With only four hours left, a rogue Jack Bauer stops at nothing to determine who is behind the day's most devastating events, and he uncovers an unexpected lead.

Jack contacts Mike and asks for a secret meeting in hopes of gathering evidence against Walt. Martha begs Aaron for help, while a desperate Walt tries to force Logan to aid him in his complicity with the terrorists. Buchanan butts heads with Lynn over a decision to violate the president's orders, while the Russians attempt to escape with the nerve gas.

Jack rushes toward his nephew and his oldest antagonist, as a Chinese sub and F-18s race for the same destination. Chloe faints. Can Jack find any peace?

George pits Bob against Reza in hopes of learning which one is working with Second Wave. Sherry and Lynne clash over Palmer's speech to the press. Kate is interrogated by Syed Ali, who believes she knows too much about the bomb. Jack and Nina fight off a group of renegade soldiers while waiting to be rescued from the crash site. They nearly escape when Nina takes Jack hostage and demands to speak to the President.

Jack and Lynn must take action when they discover that the nerve gas is breaking through the protective seals that are keeping the CTU survivors alive. Chloe wrestles with her grief over Edgar's death, while Tony contemplates revenge against Henderson. Martha bolster's Logan's spirit as he wavers under more political pressure from Gardner.

Jack and Wayne locate a recording that definitively proves Logan's involvement in the terrorist conspiracy, but Henderson corners them in the hopes of destroying the incriminating tape. Logan tries to cover his tracks by issuing a warrant for Jack's arrest. Audrey contacts her father for help, while Chloe gives her cover while helping Jack evade CTU.

Jack captures Henderson and attempts to force him to hand over the recording, but Henderson targets Heller to buy himself more time. Logan confesses his involvement in Palmer's assassination to a distraught Martha. Miles traces Chloe to Buchanan's home, but Hayes finds herself questioning Logan's motives as CTU closes in.

Jack and Tony are able to trace Dina's location, but Behrooz slips through their fingers. Dina demands a full pardon for her son in exchange for information on the override device. Edgar wrestles with his emotions when his mother is trapped in the path of the nuclear fall-out. Behrooz turns to his uncle for help, but Navi closes in on him before he can get away.

Two traitors are uncovered. One is the mole in the Palmer administration who is working with Stanton. The other is the member of the Warner family who helped Syed Ali to bring the bomb into the country. Jack learns of Ali's location and tries to rescue Kate. Kim and Miguel hatch an escape plan to stay out of LA, but the results are disastrous.

Jack and Kate race to save the life of a player tied to the terror threat; Jordan faces a perilous mission; President Heller engages Margot to put an end to her attacks.

Ramon holds Jack hostage as he flies to Mexico. Ramon plans to kill Jack, but Jack manages to hold him at bay until the plane lands. Ramon then learns that Jack and Hector are working together to break him out of prison. Gael is captured while trying to escape from CTU. Chappelle interrogates Gael but is interrupted by Tony, who claims that Gael is part of a bigger plan. Anne is given a chance to clear Palmer's name, while Chase heads for Mexico to rescue Jack.

With only five hours left, the clock races toward the climactic series finale as Jack stops at absolutely nothing to avenge the emotional setback of losing his beloved partner Renee Walker. Meanwhile, the administration attempts to keep the historic and pivotal peace agreement on track as undermining forces surface.

Tony interrogates Nina about Alvers' location, while Chappelle orders Jack to undergo a medical examination in light of his drug use. Kim and Chase have a conversation about the baby. Palmer confronts Sherry about Alan Milliken's death, while Julia begs Wayne for help.

Jack conceals himself inside the airport hanger and surveys the Russian separatists, feeding information to Curtis and his assault team. The terrorists begin executing hostages in an attempt to make Logan cave into their demands. Martha discovers that all traces of her conversation with Palmer may not have been erased.

Malevolent mastermind Jonas Hodges emerges as Jack Bauer's latest adversary as the long, terrifying day ticks deeper into the night. Jack yields results from a surprise meeting, and the fight to avert additional terror attacks continues.

Jack arrives at Palmer's hotel with a phone on which Drazen will call and ask Palmer to unfreeze $200,000,000 of his assets. When Palmer tells Jack that Drazen knows that's impossible, Jack grabs the phone and throws it off the balcony. It explodes seconds later. Realizing Drazen will never give up, Jack suggests having the television report that Palmer died in the explosion, leaving Jack to offer himself up in exchange for Kim.

Jack is captured by the terrorists, who use Derek as leverage to force him to compromise CTU's assault operation. Logan refuses to give into the terrorist demands as the time of the co-signing of the treaty draws near. Martha tries to tell her husband of the evidence she uncovered about her phone call with Palmer, but Walt interferes with her efforts. A new representative from District arrives at CTU and begins to undermine Buchanan's authority.

Tony works to free Jane from CTU before Saunders can harm Michelle, but Chloe and Jack become suspicious of his activities. Sherry meets with Palmer's political rival and proposes a deal to blackmail him.

Jack learns that one of the assassins, Alexis Mecir, is actually Victor Drazen's son and has become intimate with one of Palmer's aides. In an attempt to find the man ordering the assassinations, the aide agrees to plant a tracking device in Alexis' wallet. Back at the safe house, Teri and Kim discover their location is no longer secret or safe.

For the first time in New York City, Jack Bauer is reluctantly drawn into action as President Allison Taylor negotiates plans for international security with Middle Eastern leader Omar Hassan. As the 8th day keeps unfolding, we learn that CTU, now upgraded and operated by M.B.A.-schooled Brian Hastings, still has Chloe O'Brian, but also expert analyst Dana Walsh and systems analyst Arlo Glass.

Against his family's wishes, Senator Palmer decides to go public about the secret scandal surrounding his family. Even as Alexis' brother, Andre, sends another assassin to the Bauer residence in hopes of finding Teri and Kim, a confused and scared Teri meets Dr. Parslow, a man who says they are good friends. Unaware of the danger Teri is in, he offers to give her a ride home.

Jack and Chase quarrel over Chase's relationship with Kim. Meanwhile, they learn of a lead to the possible whereabouts of the virus after raiding a crack-house. Linda breaks up with Kyle when she learns that he is planning to make a drug delivery. Wayne approaches Palmer with information about his girlfriend that could damage his chances for re-election, while a CTU employee is not what he seems.

When a new boss, Alberta Green, takes over the CTU, Nina secretly continues to help Jack locate Teri and Kim while Jack tracks down investment banker Ted Cofell, a man who is mentioned on the decrypted key card. A shocked Senator Palmer learns that one of his associates may be willing to commit murder in order to protect his campaign.

During their escape from the safe house Teri and Kim become separated, and the traumatic events of the day result in Teri passing out and then awakening with amnesia. Assuming her mother has been re-kidnapped, Kim conducts her own search for information concerning her mother's abductors. When the plan to track Alexis backfires, Jack pretends to be Alexis in order to keep a rendezvous with one of Alexis' contacts.

Jack is back, this time in New York City spending time with his granddaughter. However, when a former contact comes to him with vital information on an upcoming terrorist assassination attempt, Jack has no choice but to become involved and take the man to CTU. But to get to CTU, they first need to survive a whole bunch of terrorists all trying to kill them. Meanwhile, Chloe struggles to settle in at her new position at the upgraded CTU, and President Allison Taylor negotiates with Middle Eastern leader Omar Hassan over weapons inspections... unaware that Hassan is the assassins' target. Also, a journalist named Meredith Reed is suspected to have direct ties with the on-going terrorist crisis.

Jack's fears are proven true when Andre Drazen breaks into the underground facility to rescue his father. With Jack as his prisoner Victor calls CTU, but Mason tells him he doesn't negotiate with terrorists. Desperate to buy some time, Jack tells Victor that his son, Alexis, is still alive. Back at the police station the police finally let Kim go, but her drive to CTU doesn't go as planned.

As Jack's day enters the early morning hours, the nation remains vulnerable, and President Taylor presses on with her international peace process. With the possibility of colossal failure facing CTU, attention turns to who is to blame, and things get personal when operatives take matters into their own hands.

Moments after discovering his daughter, Kimberly, has snuck out of the house, Jack Bauer is called into work. As head of the CIA's Los Angeles Counter Terrorist Unit office he's told that an assassination attempt will be made within the next 24 hours on the life of presidential candidate David Palmer and it's up to his team of agents to keep Palmer alive. Meanwhile, Jack's wife, Teri, sets out to find their daughter.

Jack follows the arrested shooter to the police station in hopes of interrogating him only to find that Mason has arrived and taken control of the situation. But when the shooter says he will talk only to Jack, Jack learns he must break the shooter out of jail in order to learn who has kidnapped Kimberly. Back at the hotel, Senator Palmer learns more about the threatened news leak that could hurt his campaign.

While Jack is questioned at the CTU, Teri and Kim are taken to the clinic to be examined. Meanwhile, certain he recognizes the name Jack Bauer, Palmer has Jack's background investigated. When he discovers that Jack was the sole survivor of a secret mission that he authorized two years ago, Palmer becomes convinced Jack is out for revenge and insists on talking to Jack face to face.

Four explosive hours after being unwillingly drawn back into action, Jack Bauer reteams with a risky Renee Walker to track some very dangerous leads. Meanwhile, back at CTU, a desperate Dana Walsh faces tense and untimely circumstances, and emotions escalate when President Taylor learns of a larger looming threat that jeopardizes the peace accord with President Hassan.

Convinced Jack needs to be relieved of his command, one of his team members, Tony, calls George Mason who arrives and puts the CTU under lock-down. With the help of his second-in-command, Nina, Jack slips out and heads for an address listed on the key card. Once there he encounters a shooter who hints that Kimberly's disappearance is part of a bigger plan. Meanwhile, the two boys deliver Kimberly to a man named Ira Gaines.

It's been a year since Jack lost his wife, and the emotional toll includes estrangement from his daughter Kim, who is now a live-in au pair for a troubled family. Jack is no longer with CTU, and no longer interested in that line of work - until he's summoned directly by President Palmer. The situation: terrorists have planted a nuclear device somewhere in Los Angeles and plan to detonate it within 24 hours.

A missing computer circuit board: the Russians get wind of Chinese espionage, the White House must find a leak, and CTU interrogates an unlikely witness.

With only six hours left, the clock races toward the series finale as President Allison Taylor faces impossible choices and much to the dismay of CTU, she enlists a private security firm to complete a sensitive task led by Mark Bledsoe. Meanwhile, Jack calls in a favor to his old friend Rick Vickers before he embarks upon a crucial mission of his own.

After Jack convinces Palmer he is not trying to kill him, they go over the "Operation Nightfall" file. The goal of the operation was killing a man named Victor Drazen, and a startling piece of information in the file convinces Jack and Palmer that they are both being targeted. Meanwhile, a scare at the clinic results in Teri and Kim being whisked away to a safe house.

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.

Jack and Michelle question Syed Ali, who claims that the audio recordings are false. Palmer prepares to wage war against the three countries who were involved in the nuclear strike. Kim gets caught in a hostage situation. Jack is contacted by a man who wants to exchange information for Kate Warner.

Jack reestablishes his undercover identity to join a crew of suspected terrorists that may know something about the nuclear device planted in Los Angeles. Posing as career criminal Jack Roush, his only hope in proving his loyalty to them lies in the package he's carrying. Meanwhile, President Palmer deals with a curious press, including one particularly skeptical reporter; Kim tries to protect Megan from her father; and Kate Warner follows up on suspicions about her sister's fiancé.

Three years have passed since the events of Day Two. A van deposits a dead body outside the LA Health Unit. The body is infected with a deadly virus. Tony, now in charge of CTU, learns that this is a blackmail tactic to get the US government to release a drug lord, Ramon Salazar, whom Jack has just brought down, before Salazar's brother releases the virus into LA. Jack and his new partner, Chase Edmunds, prepare to sign a deal with Salazar at the prison. Salazar delivers a mysterious warning to Jack before killing his lawyer. Palmer is alive and well, and has returned to LA for the first time since the attack three years ago. He is running for re-election and is preparing for an important debate with a rival senator. He is accompanied by his brother, who happens to be his chief of staff and his doctor, who also happens to be his girlfriend.

Jack is captured and tortured by men who want the chip. Kate and Yusuf run into a group of angry rednecks before they can deliver the chip to CTU. Tony and Michelle share a tender moment after her brother flips out. Palmer leans towards holding off the attacks, while Lynne discovers a secret operation that the Vice-President is planning against Palmer.

Kimberly and Janet realize they are in danger after it becomes clear that their two dates have kidnapped them. Despite the threat on his life, Senator Palmer sneaks out of his hotel to meet a reporter who has damaging information that could affect his campaign. Back at the office, Jack has Jamey, a member of his team, decrypt the key card.

Jack meets with the surviving Coral Snake Commando, who demands Kate Warner in exchange for evidence about the recordings. Tony and Carrie spy on Michelle when he suspects that she is working with Jack. Mike and the Vice-President turn up the pressure on Palmer, when he expresses his doubts about the impending war.

Despite averting the assassination attempt on foreign peacekeeping leader Omar Hassan, Jack Bauer's day intensifies when he is forced to go further 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.

Although he prevents Palmer's assassination, Jack is taken into custody where his story of his kidnapped wife and daughter is not believed. Knowing his family will only be kept alive if he is free to help Gaines, Jack knows he must escape. Back at Gaines' compound, Teri and Kimberly struggle to stay alive, while at CTU the traitor reveals that the whole unit has been wired so Gaines can watch their every move.

George refuses to allow Jack to assist in Nina's interrogation. Jack resorts to blackmail to change George's mind. Palmer and Stanton meet with a Middle Eastern ambassador who may be in league with Second Wave. Tony visits the Warner home and questions Reza about his possible connection with Syed Ali.

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, a tense meeting between President Taylor and Omar Hassan takes an unexpected turn as the global security stakes are raised.

President Taylor pressures CTU for progress while Jack's perilous plan has operatives panicked. As the scope of the looming threat expands, the dynamic at CTU changes and the ongoing crisis worsens.

While the newly-upgraded CTU is challenged by some unexpected and complicated circumstances, Jack Bauer becomes even more involved in preventing an upcoming assassination attempt on Omar Hassan, a visiting President. Meanwhile, international security is jeopardized by an explosive event, and Jack is reunited with agent Renee Walker.

Teri receives a phone call from Alan York who says his daughter, Janet, is a friend of Kimberly's and is also missing, so the two parents join forces to try and find the girls. Even as Jack is secretly called out of the office and given an encrypted key card containing information on the Palmer hit that could lead him to a dirty agent within his organization, the explosion of a 747 over the Mojave Desert becomes yet another piece in the puzzle.

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.

Jack's search takes him to the home of an old enemy, while a bomber slips into the White House.

Jack locates the man who forged the audio evidence, but his efforts to break him down are sabotaged by Sherry Palmer, who has a hand in the conspiracy. Kim returns to the Matheson home, where she discovers that her problems are far from over. Palmer searches for an ally who will help him get a message out to CTU. Tony and Michelle take Chappelle out of action when he hinders their efforts to help Jack.

A man named Andre Drazen contacts Gaines. Clearly disappointed that the morning's events did not go as planned he threatens to relieve Gaines of his assignment. Across town, Jack kidnaps Cofell and, after hearing Cofell's Serbian accent, has Nina break into an old case file profiling a secret mission Jack was on in Belgrade and Kosovo two years ago. Then Jack meets Cofell's contact: the man who claimed to be Alan York.

Jack finds himself confronting his father while the lead terrorist needs help if he's to explode the remaining bombs.

Alexis' contact turns out to be a power company worker who was being paid to shut off the electricity to a power grid out in the middle of an empty field. As Jack and Mason follow up on that lead, Kim's search for information lands her in jail, even as Palmer's press conference disclosure could ultimately put his own son in jail.

Four more "suitcase nukes" are out there, and Jack's only lead takes him to the home of his brother.

Palmer clears Anne's name with the press, but he finds that he is facing a new problem when his biggest campaign contributor reveals a startling secret about Wayne. Kim and Michelle worry about Tony's mental ability when he continues to make mistakes. Jack and the Salazars meet with Amador, but the deal turns sour when Nina Myers appears on the scene and competes for the virus.

Jack pushes Driscoll to reinstate him in the wake of Heller's kidnapping. He finds himself working as a subordinate when the Field Ops team goes to pick up Andrew. Behrooz finds himself torn between his loyalty to his parents and his feelings for his girlfriend as he is sent on his first assignment. Heller tries to comfort his daughter as his captors broadcast their intentions on the Internet.

Jack has Nina connect Victor Drazen to a hospital phone so he can talk directly to Alexis. Nina then advises Palmer of the situation. Palmer urges Mason to arrange the exchange Drazen proposed: the return of Jack for the return of Alexis. Although Alexis is delivered, Drazen holds onto Kim and tells Jack he needs to do one last thing if he wants to see his daughter again.

President Taylor's vision of global peace has been foiled over the last 13 hellish hours, and the situation worsens when the imminent threat of mass destruction clarifies. As her idealistic nature becomes a point of contention, she tasks Jack Bauer with a crucial mission, and advisor Ethan Kanin returns in the heart-stopping.

Kim and Miguel are arrested and the police plan to take them back to LA. Tony questions Bob Warner at CTU and learns more about his government connections. Palmer discovers a traitor in his ranks when the journalist whom he was holding is set free. Nina pulls a deadly countermove, setting herself up as the main player in the search to locate the bomb.

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 over two pulse-pounding hours.

Jack enlists the help of an autistic man in the search for Gredenko, and Sandra Palmer makes a fateful decision.

The clock races into the middle of the night when the threat of a devastating nuclear attack accelerates as Jack tracks an informed terror suspect who has an explosive strategy. Back at CTU, a key player grapples with being demoted, and the day takes an unexpected stressful turn when pesky parole officer Bill Prady enters the picture.

Jack begins his interrogation of Nina and pushes all boundaries in order to force her to divulge the name of her contact. Palmer is surprised and suspicious when his ex wife Sherry returns and claims to have information about a conspiracy against him from within his own administration. Kim and Miguel plan to kidnap Megan from the hospital in order to take her out of LA and away from the nuclear threat.

Jack's search takes him to the Russian Consulate, while the Vice President contemplates a sweeping executive order.

Claudia manages to free Chase from his captors, but she pays a high price for her efforts. Wayne turns to Julia, while Palmer calls on Sherry for help against Milliken. Jack and Ramon make plans to get to Nina, in the hopes of intercepting the virus. Chloe's work at CTU is disrupted when she is forced to take care of her baby.

Jack attempts to use Saunders' daughter as leverage to gain control of the virus, while Palmer must deal with the discontented press. Michelle gets the results of her test, while Adam finds that the virus has struck too close to home. Tony finds himself compromised when Saunders exploits his only weakness.

Jack and former terrorist leader turned peacemaker, Hamri Al-Assad, track a suspicious man to a self-storage facility.

Russian ire worries the White House, while the Chinese take on CTU, and the damaged circuit board is in surprising hands.

Jack and Ramon struggle to evade the authorities, while Palmer must shut the debate down because of the prison break. Kim accidentally stumbles on to Gael's secret communications, but she isn't able to warn Michelle in time. The Singer family learns a startling piece of news about Kyle's health.

Russia presses the White House, while Jack must try to thwart the Chinese and his oldest antagonist simultaneously.

Michelle is torn by personal and professional obligations when she must take charge of CTU after Tony is wounded. Kyle and Linda are captured by Hector's men. Jack and Palmer have a secret conversation, leading Jack to take drastic action in the face of the Salazars' threat. But Jack's plans are complicated when Chase gets in the way. Anne pushes Palmer back onto moral ground in the face of her ex-husband's blackmail scheme.

Palmer and Chappelle view a message from Jack, explaining his undercover work with the Salazars. Meanwhile, Hector tries to convince Ramon that they should deal with Bauer so that they can get their hands on the virus. Jack has a private moment with Claudia and she blasts him for leaving her behind when he arrested Ramon. Chase arrives in Mexico, but is captured by Hector's men. Ramon devises a way for Jack to prove his loyalty to them. Anne manages to clear Palmer's name, but she breaks off her relationship with him.

A new U.S. President has negotiated Jack's release from a Chinese prison so Jack can stop a series of terror attacks... with his life.

Jack tracks down a man who has a connection to the terrorists. Logan is forced to grant him immunity in exchange for information on their whereabouts. Mike and Martha argue over Logan's public response to Walt's involvement with the Russians. Lynn is drawn away from his post by a personal crisis as the terrorists come closer to striking against the U.S.

Jack goes rogue to save a woman, and the White House needs a fall guy for Fayed's success.

While lives remain on the line, an emotional Chloe copes with the declining conditions. With only a few hours left in Jack Bauer’s day, the situation worsens when the politicking inside the White House corners the divided administration.