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.

Jack and Chloe infiltrate Wayne Palmer's penthouse where David Palmer was assassinated, in the hopes of finding a clue to his murder. Jack convinces Wayne to cooperate and finds some information in Palmer's memoirs that leads him to the airport where the Russian president is about to land. CTU and Secret Service attempt to capture Jack, but they only find Chloe as Jack and Derek slip through their grasp. Martha tries to convince her husband that she received an important phone call from Palmer the night before his death, but a tape of their conversation seems to contradict her claims. Jack goes to the airport to find a lead, but a group of renegade Russian terrorists take hostages, including Derek, before he can act.

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.

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.

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 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 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 poses as Rossler and manages to trace one of the canisters of nerve gas, but he goes against orders from the president when the terrorists target a shopping mall.

Logan and Martha quarrel when she learns of her husband's intention to cover up the real reason for Walt's suicide.

Lynn orders Curtis to take Jack into custody for violating presidential orders, but Jack breaks away from Curtis when Nathanson contacts him through Audrey and offers information on the location of the nerve gas.

Lynn begins to unleash on his coworkers as he discovers that they may be working against him to aid Jack.

The head of the terrorists makes a demand on Logan, and Martha takes a dangerous step to get her husband's attention.

Logan wrestles with his conscience when he learns that Martha is riding in the motorcade with the Suvarovs.

Audrey convinces Curtis to take action as Lynn continues to abuse his authority.

Jack learns that an ex CTU agent, Christopher Henderson, works for a company which is connected with the nerve gas.

Jack interrogates Henderson's wife about her husband's connection to the terrorists.

Lynn begs his sister to return his stolen keycard, while Tony regains consciousness and learns of Michelle's fate.

Martha gives Logan the cold shoulder, while Curtis tracks another nerve gas attack to a local hospital.

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.

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 bargains with a German intelligence agent in order to find the woman who can lead him to Bierko.

Buchanan chafes against the new chain of command as Homeland Security prepares to take over CTU operations.

Aaron receives a request for a secret meeting from Wayne Palmer, as Logan implements martial law in L.A.

Jack pushes Audrey for answers when evidence indicates that she may be involved with the terrorists.

Wayne and Aaron flee from a group of gunmen who have orders from Henderson to kill them.

Bierko and his men gain access to a natural gas plant, where they plan to distribute the nerve gas throughout L.A.

Jack and Wayne locate a source inside Logan's administration who has information on Palmer's assassination. But things get complicated when they learn that Henderson is using leverage to keep her silent.

Audrey is forced to choose between Chloe and Buchanan as Homeland Security begins to absorb CTU.

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 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.

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.

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 searches for a safe place to land the plane when Logan gives orders to shoot it down. Hayes readies Bierko for a transfer to a secure facility, while Audrey receives some good news about her father. Logan becomes desperate as his plans start to unravel, but an unexpected ally at CTU turns the tables in his favor.

Bierko escapes from the transport taking him to Division and uses his last canister of nerve gas for a surprise strike. Jack is forced to work with Henderson to find Bierko, but Henderson wants something in return. Logan takes drastic steps to deal with Aaron when he won't go along with the cover-up.

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.

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.

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.

Can Jack and an unlikely ally stop a suicide bomber and track the architect of these acts of terror?

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

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

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

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

Family troubles: Jack with his brother and father while Morris worries about his own brother.

The President meets with a known terrorist, while Jack searches for Morris, Fayed seeks a trigger, and Tom Lennox makes a choice.

Jack looks for a Russian national as his father plots with shadowy patriots. Meanwhile, the President and the Constitution may be in danger.

While Jack looks for Gredenko and tries to save Josh, White House intrigue deepens.

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

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

The search for Gredenko finds Jack hunted inside the Russian Consulate and a former President calling on his ex-wife.

CTU's satellite tracking system is compromised as a bomb-carrying drone heads toward an unknown city. Meanwhile, US forces prepare for a nuclear retaliation on the Middle East.

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

Jack baits Fayed with Gredenko, while the President faces a challenge to his office.

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

The Chinese want Jack to give them Russian nuclear technology, and the President wants the Vice President's resignation.

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

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.

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

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

In order to prevent a war with Russia, the White House orders a trade of Jack's nephew for the circuit board, and puts Jack in custody so he cannot stop the exchange.

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?

Since Jack Bauer has been pulled from his senate sub-committee hearing to assist with the deadly domestic threat and the investigation of former colleague Tony Almeida, his new undefined role is to help secure the nation. Meanwhile, President Allison Taylor presides over the escalating time-sensitive dilemmas linked to the unrest in Sangala. Chloe O’Brian and Bill Buchanan are on hand this season as well as FBI Agents Renee Walker, Larry Moss, Janis Gold and Sean Hillinger to cope with the unthinkable events

Since Jack Bauer has been pulled from his senate sub-committee hearing to assist with the deadly domestic threat and the investigation of former colleague Tony Almeida, his new undefined role is to help secure the nation. Meanwhile, President Allison Taylor presides over the escalating time-sensitive dilemmas linked to the unrest in Sangala. Chloe O’Brian and Bill Buchanan are on hand this season as well as FBI Agents Renee Walker, Larry Moss, Janis Gold and Sean Hillinger to cope with the unthinkable events

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.

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.

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.

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.

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.

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

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

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.

Not even at the halfway point of this hellacious day, two planes have collided outside of D.C., there has been an attempt on a chemical plant in Ohio, the President’s husband’s life has been threatened and the nation remains at risk. When Dubaku’s evil plan escalates to his boss, General Juma (guest star Tony Todd), the stakes are raised and steadfast President Taylor faces a deepening foreign policy dilemma.

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.

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.

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.

Olivia Taylor, the President’s daughter, becomes increasingly involved in the day’s events, and the administration reels when a high-ranking official delivers devastating news.

The game changes for Jack Bauer, and the FBI is forced to collaborate with other federal agencies. As the threat intensifies, the administration shakes things up and seeks a new perspective.

As the day stretches into the middle of the night, Jack and the FBI formulate a plan to prevent further terror attacks. Events take an unexpected turn when the politics surrounding the administration expand beyond the White House.

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.

As the nation remains vulnerable, Jack Bauer endures the worsening pathogen pain. The FBI deals with recent deadly developments while matters involving key players takes this day into a unexpected direction.

The nation remains vulnerable as Starkwood mastermind Jonas Hodges (guest star Jon Voight) remains at the epicenter of the mounting terrorist threat. Meanwhile, the FBI and the administration scramble to provide security and justice, and Jack Bauer questions a key suspect

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.

Innocent lives remain in the line of fire as this terrifying day draws to a close. Jack is faced with an unthinkable situation while his perpetually imperiled daughter, Kim (guest star Cuthbert), gets involved. Meanwhile, the imminent threat stokes the heated rivalry between Chloe and Janis.

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.

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.