24

In the series pilot, a Federal agent is assigned to stop an assassination plot after just learning his daughter has sneaked out after midnight. Bauer: Kiefer Sutherland. Teri: Leslie Hope.

Jack receives a desperate call from Walsh, who has found key information about the Palmer investigation. Meanwhile, the Presidential candidate slips away to seek help in dealing with a scandal that could derail his campaign.

Jack asks York to stay with Teri at Janet's car; Mandy tries to fix her partner's error; Jack picks someone to trust; Palmer meets with a confidant who assures him "I'll take care of it.

York and Teri are stopped for speeding; a clue from the key card sends Jack back into the field, where he meets a helpful and knowledgeable cop.

York finds his daughter, while Kim meets her captors' employer; Mason intercedes before Jack can question the cop killer; Palmer meets with Maureen Kingsley who names her sources

Jack needs Nina's help in identifying a body; and meets Teri and York at the hospital as doctors work on Janet; an operative surprises Palmer.

Teri turns the tables on York; Gaines orders Jack to compromise CTU security; Palmer decides to go public with Keith's secret, sparking controversy within the family.

Jack discovers his pivotal role in Gaines' plan; Jamey and Tony each get news about Nina; the impostor photographer gets through security and meets the Palmers.

Jack's explanation of the power-plant incident is met with skepticism from the Secret Service; Teri makes a sacrifice for Kim; Jack seeks leverage against the stonewalling Jamey.

Jack evades police while working with Nina to find Teri and Kimberly; Tony finds a clue on Jamey's computer disk; Gaines is contacted by an unhappy employer.

Nina hurries a psychological profile to help Jack with an interrogation as he takes a colleague of Gaines' for a wild ride; Eli punishes Rick; Gaines asks for more time from his employer, who mentions a contingency plan that doesn't involve him.

Jack closes in on his family's location; a suspicious Green confronts Nina and Tony, and separates them for interrogation; Palmer learns just how far his backers are willing to go.

Jack gives Rick a second chance; Teri and Kim are forced to deviate from Jack's plan; Green orders an interrogation of Jamey's mother; Palmer gets surprising news from Maureen Kingsley.

Jack is again separated from his family, and Nina thinks they may still be in danger; new information prompts CTU to advise Palmer to leave California ASAP; Keith has a change of heart after learning about Ferragamo.

Teri and Kim are moved to a CTU safe house; Palmer meets with Jack, who realizes they have a common acquaintance---who may also be a target.

Pictures of suspected assassins are shown to Palmer's staff; Nina leaves the safe house after a tense moment with Teri; Jack and George Mason disagree over how to make the most of a lead.

Keith issues a challenge to his father after meeting with Carl; the CTU and Secret Service try to take advantage of their best lead thus far; Mason declines telling Jack about his family and the jeopardy they may be in.

Following a new lead, Jack must work with a fellow CTU agent who harbors resentment toward him; Dr. Phil Parslow tries to diagnose Teri and explain their history; Kim meets Dan's brother.

Teri returns home in an effort to jog her memory; Mason and Jack investigate a lead obtained by Palmer; Dan's brother takes matters into his own hands after learning of Dan's death.

Rick tells Kim what to tell the cops; and the country reacts to Palmer's press conference.

Mason orders backup for Jack; Victor Drazen and Jack debate responsibility for their respective actions; Teri is brought back to CTU; Kim stands her ground against Melanie.

Victor offers a deal to the Feds, and Palmer makes his own deal in order to help Jack after learning Victor is alive; CTU learns the latest on Kim.

Jack is forced to do the Drazens' bidding; CTU uncovers a lead on a second traitor; Kim witnesses the reunion of Victor and Alexis; the Palmers make plans for the future.

Sherry Palmer complains about her role in the media ruse that's buying time for Jack, who engages in a war of wills with the Drazens.

It's a year after Teri Bauer's murder, and Kim's estranged from Jack, who has left CTU, until a call for help from President David Palmer.

Jack carries a package that he hopes will prove his loyalty to Wald's people; Kim tries to protect Megan from her father; Palmer has a problem with a skeptical reporter.

Kim makes contact with Jack, who tries to warn the immediate target; a new lead detours Mason's plans; Kate is asked to remain calm in the face of disturbing news.

Mason makes hard choices to retrieve vital information; Reza joins Kate on an errand; Jack gets closer to Wald; Kim urges Carla to take a stand for Megan.

Mason prepares to interrogate an old adversary; Jack gets more disturbing news from President Palmer; Tony goes to the Warner house to talk to Reza.

Nina tries to set the rules as Jack begins his interrogation; Kim reaches Megan; Reza asks for a lawyer; the president learns that one of his orders has been countermanded.

Finesse rather than force is required once Jack and Nina reach Visalia; Palmer directs his Chief of Staff to investigate Sherry's charge; Mason calls his estranged son; Warner and Reza are taken to CTU.

Stanton expresses concern over the presence of Sherry, who offers to deal with the detained reporter; transit of the bomb is interrupted; Tony hears a confession from Bob Warner.

Palmer IDs a person working against him; CTU learns the source of the plane's problems; Mason tries a different tack with Warner and Reza; Kate is questioned about her father's files.

Palmer meets the press to respond to Weiland's report; a tattoo proves a telling clue about who brought the plane down; Miguel hits on a plan to delay his and Kim's return to L.A..

Ali assigns Marie another duty to complete their mission; Palmer orders the interrogation of Stanton; Kate takes a lead role in getting to Ali; Sherry lobbies for more inclusion.

Warner gives some history on Marie, who talks to Kate; Jack explores a suspect's vulnerability; Mason tells Tony to stop searching for Kim; Lynne investigates a suspicion about Sherry.

Kim finds a level of comfort in her new environs; CTU experiences a power struggle; an insider reveals that the bomb has more protection than was previously believed.

Mason notes his own slowdown; Kate is drafted to help interrogate two suspects; Sherry Palmer tells her story to the president; Michelle has words with a new arrival at CTU.

The planned detonation time is determined; Ali's effects yield clues regarding the bomb's source; Jack has a conversation with Kim; Palmer makes a bold move to reassure the public.

Carrie criticizes Michelle's interrogation of Ali; the president formulates a response to those behind the bomb; and another violent incident at CTU puts Jack and Tony at odds.

Jack receives a surprising ally before meeting with the surviving member of Coral Snake, who explains the purpose behind the bomb; the VP expresses concern about Palmer's capability; Carrie shares suspicion about Michelle with Tony.

Kim comes clean with the cops; Michelle takes further risks for Jack; the president moves to curb civil unrest on the East Coast, while facing pressure to lock in his retaliatory plans.

Jack's resolve is tested by a bomber hoping to keep his plan intact; Tony meets the source of stress between Carrie and Michelle; a presidential advisor's loyalty is questioned.

The unavailability of the vice president raises curiosity in Palmer; Carrie plays politics when Tony disobeys orders; one presidential adviser wavers as another takes a fall. Chappelle:

Tony and Chappelle face off over the chip, the status of which Jack reports to Palmer, whose earlier actions regarding the bomb come to bear in a meeting with his cabinet; Kim is returned to the scene of a crime after speaking with Jack.

CTU declares Jack's quest over, as staffers are informed of a major D.C. shake-up; two key players question their trust in each other; Palmer lobbies for an ally; Tony takes a page from Jack's book.

Chappelle's unavailability prompts Division to question Tony, who puts Michelle in position to circumvent their command; Palmer is asked to perform a final executive action; Jack proposes a deal between conspirators.

Michelle and Tony benefit from new evidence against Kingsley, who reassures his conspirators; and Bob Warner confronts Marie

Jack witnesses a murder linked to his lengthy undercover assignment; the delivery of a contaminated corpse precedes a threatening call to the FBI. Chase.

Jack and Chase visit the last address of the infected body; Palmer suggests cancelling the debate, but Wayne disagrees, hinting at a vulnerability in their opponent; Hector's location is narrowed down.

Kyle's parents get a clue about his activities; Wayne finds a solution to the problem regarding Anne; Salazar requests another meeting with Annicon; the virus's infection and fatality rates are revised upward.

CTU receives instructions for Salazar's delivery; Kyle and Linda get a glimpse of what they're into; Chase disobeys Jack, who makes a report, and a suggestion, to the president.

Jack's diversion at the prison comes back to bite him; Gael seeks to slow CTU's tracking of Kyle; Kim is rattled by news of Jack's activities; Keeler plays the Anne card at the debate.

After Chappelle takes command at CTU, Chase lobbies him to get Palmer's input on Jack's situation; Kim's emotional state is questioned; Kyle's parents get a prognosis on their son.

Michelle asks Gael to take over for her; Chase gets help in disobeying Chappelle to pursue a lead on Jack's location, where Ramon grows impatient; Anne is contacted by her ex-spouse.

Wayne and the president disagree over Jack's actions, which are explained to Ramon; CTU tries to intercept Chase; Anne gets more than she wants from her ex-husband.

Michael changes the arrangements for the sale; Jack gets an ally; Palmer is summoned by an important supporter; Tony's competence is questioned.

Gael speaks to Jack; Wayne tries his own field op when Milliken flexes his muscle against Palmer; Sergio delivers disturbing news to Hector; Chloe responds to a family emergency.

Emotions carry weight as Palmer makes a deal in his "street fight" with Milliken; Hector's doubts about continuing the operation cause dissension with Ramon; Kim gets a disturbing assignment.

Tensions escalate at CTU with the arrival of a cocky systems analyst and a question about Chloe's baby; Sherry gets the goods on Milliken, but Palmer balks at the price.

Nina takes things in a new direction, and adds a new player; Chloe is out of service when CTU needs her most; Sherry launches a stealth op against Milliken.

Sherry lies to Palmer about seeing Julia; Alvers alters the virus; Nina is introduced to new interrogation techniques, while Jack is also questioned regarding his past infiltration of the Salazars.

CTU IDs the system likely to launch the virus; Amador is chastised by his employer, who's familiar with Jack; the police question Julia without a lawyer present.

Extreme force is ordered to isolate the hotel; Sherry threatens Palmer over Milliken's death; the amount of virus remaining and its altered power is determined; a conspirator makes a deal to tell what he knows.

The link is found between Jack and Saunders, who makes his first demand of Palmer; Jack uses a legal loophole against a new witness; Michelle lobbies to ease the pain of the infected.

Jack prepares Chappelle for his assignment; a hotel guest reports a missing companion who may have left the hotel with the virus; Michelle gives the infected the cold truth, with an option.

Jack urges caution with a new lead and it comes back to bite him; Cole seeks help for his nose; Palmer convenes the cabinet before hearing Saunders' next demand, and ultimate goal.

The president is ordered to leave L.A., and asks the press to help maximize public safety; Jack gives Jane a crash course on her father; the virus affects another CTU operative.

As Saunders keeps him on a tight rein, Tony scurries to cover his tracks, while the rest of CTU suspects another mole; Sherry Palmer makes an offer of assistance.

Michelle tries to unnerve one of her captors; Keeler personally plays his card against Palmer; Tony argues with Saunders over arrangements for their trade.

Jack argues for Tony, who's taken into custody; an implacable Saunders tells the time of the next attacks; Wayne and Foxton have differences on their operation as time runs out, and afterward.

Saunders reveals the B-plan of the last courier, who benefits from a CTU snafu that gives Tony a temporary reprieve as he's called back to the case. Meanwhile, Chase makes decisions about his future.

An attack on an L.A. commuter train is followed by a possible threat to the Internet, bringing forth a suspect who arouses suspicion of more in Jack Bauer, now working for the Secretary of Defense

Eighteen months after the conclusion of Season 3, CTU has a new leader, Erin Driscoll, a steely government agent who made firing Jack one of her first priorities. After the explosion of a commuter train, Jack, who is now working for Secretary of Defense James Heller and also is romantically involved with Heller's married daughter, Audrey Raines, suddenly finds himself heading back to CTU for a meeting with Driscoll.

Driscoll orders tough measures against Richard; Chloe's trust in Jack is tested; a personal matter distracts Curtis; Jack goes to great lengths to detain a suspect; Behrooz asks his mother for help to change his father's command.

Dina reassures Debbie and Behrooz; Kalil tries to rally his fellows against Jack, who draws a crowd; Chloe recruits more help for Jack; Heller's health comes into play.

Jack must track a new lead to Heller after the police make a crucial mistake with Kalil. Meanwhile, Omar threatens great harm to Audrey unless Heller signs the confession.

In a race against time, Jack attempts to rescue Heller and Audrey before the military bombs the terrorist compound and kills everyone inside. Meanwhile, Behrooz faces a difficult order from his father.

CTU races against time to prevent the terrorists from melting down nuclear power stations across the U.S. Meanwhile, Jack reaches out to an old friend for help; and Sarah gets suspicious about Marianne.

The president orders evacuations from six cities; a trap is set for the mole; Jack and Audrey find a surprise at Tony's; Dina and Behrooz risk a stop at a medical clinic.

Heller coordinates evacuations when a nuclear plant goes critical; Edgar asks a personal favor of Audrey; Behrooz seeks help from his uncle.

Navi prepares to defend his location; Curtis interrogates Marianne, whose information sends him into the field; Audrey meets again with her husband; Tony returns to CTU for the first time since his conviction for treason.

With Audrey present, Jack questions Paul and finds a link to Marwan; Tony turns tough when Dina pleads ignorance beyond her husband; Driscoll's daughter again proves problematic.

Marwan's alias is discovered and his immediate past suggests more trouble ahead; the makers of the override attempt to control damage---to their company.

Reinforcements are brought in to track down Jack, who recruits looting victims to help send a signal to CTU; Michelle asserts her authority, with Sarah and Tony in particular. Naji:

Jack proposes a high-risk operation that prompts Michelle to call in help; Dina makes another deal and gets to see Behrooz; an Air Force pilot is pulled into Marwan's next phase.

Anderson hits a snag at the Air Force base; Marwan offers a deal to CTU, where crucial info is lost in a battle of egos; Audrey is made aware of Jack's expendability.

A Marwan operative alludes to another attack within the hour, while another gets help from Jack in searching for a missing hard drive; the president prepares to address the nation.

Two campers are engaged in Marwan's battle when they retrieve something from Air Force One; an aide notes a lack of confidence in the vice president; Tony and Michelle make peace.

A terrorist's carelessness enables CTU to pick up his trail; the new president takes cover before addressing the nation; Marwan plays the law to his advantage.

Audrey is among those chiding Jack for his treatment of Prado; Marwan tapes a message for the U.S. populace; former president Palmer is asked for counsel when Logan questions his own capabilities.

The slow pace of diplomacy prompts Palmer to approve a covert operation; Audrey makes a decision about Paul.

Palmer seeks to deflect responsibility for the raid as the Chinese try to ID those involved, and Audrey is asked to provide cover for Jack; and Marwan moves his schedule up in response to CTU's technical defenses.

Officials debate telling the public about the next possible terrorist target; new details about the Heller kidnapping come to light; an ambitious politician questions Palmer's presence at the White House.

A manpower shortage adds to the toll on Michelle; the Chinese step up their investigation of the consulate raid; disaster management becomes CTU's priority.

The target city is determined; the Secret Service IDs Mandy from a past incident; an aide ignores a dictum from President Logan, who chides Palmer when things look darkest. Cummings: John Allen Nelson. Spaulding: Patrick Kilpatrick. Marwan: Arnold Vosloo.

An assassination rocks the nation as President Logan prepares to sign a treaty with the Russians that promises a new level of cooperation in the war on terror.

Jack is framed for a high-profile crime and tries to find the real culprit to clear himself.

Jack is still on the run, but he attempts to follow the leads he's discovered on a terror threat involving Russian separatists.

The terrorists acquire 20 canisters of nerve gas, and matters at CTU are further complicated when Lynn McGill (Sean Astin) from the district office arrives to oversee operations.

CTU tries to find a mole in its midst, and a suspect hiding among the hostages at the airport introduces a harrowing new element to the terrorist equation. Lynn McGill: Sean Astin.

Allegiances are tested as the line between the good guys and bad guys blurs. Lynn McGill: Sean Astin.

With 20 canisters of weaponized nerve gas in the hands of the terrorists, Jack rejoins CTU until the crisis is over.

Jack pretends to be Rossler, the programmer who was making a new arming chip for the nerve-gas canisters, in hopes of being taken to where the terrorists are, but the militants have another agenda.

McGill orders Jack back to CTU for disobeying instructions at the mall, but Jack ignores him to follow a lead on the terrorists that he received from an unlikely ally.

Following a lead on a company that made nerve gas for the military, Jack encounters an old nemesis. Meanwhile, terrorists plan an attack.

As the Russian separatists make plans to use the nerve gas on American soil, CTU races against the clock to try to thwart them. Elsewhere, Jack faces old nemesis Christopher Henderson.

Jack continues to try to get information on the location of the terrorists from Henderson.

CTU deals with the aftermath of a terrorist attack, and Jack hopes that his old nemesis Henderson will lead him to the terrorists.

Jack and Curtis run down a lead that Audrey found from decrypting Henderson's computer files; Vice President Gardner puts pressure on President Logan; and Bierko and the terrorists plan their most insidious attack yet.

CTU follows up on information received from terrorist collaborator Collette Stenger; a CTU insider becomes a suspect, and Chloe plays a key role in the investigation.

Jack fears that whatever Henderson was willing to give up his life---and his wife---to keep secret may be bigger than anyone knows, and wants to make finding Henderson priority No. 1.

Jack and Wayne Palmer go after a piece of evidence that will prove who's involved with Henderson in the terrorist conspiracy. However, martial law, Homeland Security's takeover of CTU and an all-points bulletin for Jack's arrest impede their efforts.

Jack tries to get evidence against Henderson's coconspirator to the attorney general with Henderson in pursuit.

Jack goes after Henderson, with help from Buchanan and Chloe.

Jack gets airborne in a search for crucial evidence, with help from a surprising ally on the ground.

Jack tries to stay alive, with a little help from his friends, and Audrey gets some good news.

Seemingly resolved aspects of the terrorist conspiracy and President Logan's involvement in it become unraveled, and a surprising alliance is forged.

Bierko and the terrorists have seized a submarine and threaten to use the weapons system, while unlikely allies

With the evidence against Logan destroyed, Jack comes face-to-face with the president and tries to trick him into confessing his involvement in the David Palmer assassination.

A wave of terrorist attacks hits 10 U.S. cities in 11 weeks, and President Wayne Palmer is forced to consider desperate measures.

Jack escapes from Abu Fayed and tries to warn CTU that Fayed, not Assad, is behind the bombings, and the strike on Assad should be canceled.

Jack and Assad hope that Masheer, one of Abu Fayed's men, will lead them to Fayed.

The stakes are raised in the search for Fayed and Numair, and Jack takes over the operation at President Palmer's request.

CTU and the Palmer administration are left reeling by the terrorist incident in Valencia, but terrorist Abu Fayed has problems of his own.

Jack's family becomes part of the investigation; politicos Reed Pollock and Thomas Lennox strategize on how to advance their agenda; and President Palmer delivers an address to the nation.

Jack and his brother's fortunes are reversed, and Lennox lobbies President Palmer hard to approve Executive Order 1066.

Darren McCarthy runs into some trouble trying to deliver a specialist to Fayed, and those dissatisfied with President Palmer's handling of the crisis begin to align.

The search for Fayed proceeds through a search for coconspirator Gredenko, and Graem's wife, Marilyn, may be able to help.

Chloe covers for another agent; Milo is thrown into unfamiliar duties; and Jack faces a hard compromise. Reed Pollock:

Jack follows up on the lead his father gave him; Fayed gets assistance from a Russian accomplice; and President Palmer tries to cement an unlikely alliance.

An attempted coup d'état rattles the Palmer administration, and Jack warily accepts an offer of help from former president Logan.

Mike Doyle joins CTU as head of Field Ops, just in time to oversee a crucial mission. Meanwhile, Jack has information CTU needs and no way to get it there, and Charles and Martha Logan have a tense reunion.

Jack deals with devastating news, and acting president Noah Daniels (Powers Boothe) mulls enacting controversial measures.

Gredenko puts his Plan B into action; new evidence about a CTU agent comes to light; and Karen tries to shift the balance of power.

Jack interrogates Gredenko and tries to get him to lead CTU to Fayed, while Vice President Daniels invokes the 25th Amendment and calls for a Cabinet vote on Wayne Palmer's fitness to be president.

President Palmer makes a bold gambit, and Jack changes his strategy about Fayed.

Jack risks sparking an international incident when he launches a rescue mission, with a little clandestine help from Chloe.

While Vice President Daniels and Lennox mend fences, relationships are shattered at CTU.

CTU searches for a lead on Cheng from Audrey, and acting president Daniels believes there may be a leak at CTU or the White House.

Doyle leads a CTU tactical team to a location thought to be Cheng's safe house, and Lennox and Daniels concoct a plan to feed disinformation to the Russians.

The drama escalates between the U.S., China and Russia, and things get personal for Jack.

Vice President Daniels orders CTU to exchange Josh Bauer for the Russian sub-circuit board, but elements in both the White House and CTU second-guess his decision.

Jack goes after Joshand Cheng with a little help from some old friends.

Season 7 opens with Jack Bauer on trial in Washington, D.C., and the return of Tony Almeida, who is involved in a national-security breach. New president Allison Taylor must deal with the threat without CTU, which has been disbanded.

Tony Almeida returns and is involved in a national-security breach.

Col. Dubaku orders President Taylor to withdraw U.S. troops from Sangala, threatening to use the CIP module if she does not.

President Taylor mistrusts Jack and Tony, and charges Larry and the FBI with finding them. Meanwhile, Jack and Tony try to get to Dubaku through Emerson.

Jack Bauer works with the FBI and President Taylor as the terror threat escalates, and the First Gentleman pursues his own agenda.

Dubaku has President Taylor between a rock and a hard place as she must decide if she should negotiate to avoid a terrorist attack. Meanwhile, Taylor's husband continues to pursue his own agenda, and Jack has a bold plan to shield the country.

The Sangala standoff continues, and Dubaku threatens another high-value target with the CIP module. The entire security community scrambles to identify the target, and Jack, Chloe, Tony, Renee and Bill follow leads. Meanwhile, FBI agent Janis Gold (Janeane Garofalo) brings a touch of paranoia to her job.

President Taylor and her administration continue to oppose the Juma regime in Sangala, in spite of recent terror attacks. Then Dubaku ratchets up the tension when he threatens the first family.

The first family, including daughter Olivia (Sprague Grayden), face painful circumstances; Chloe has words with Janis Gold; and Jack and Agent Walker track leads, trying to prevent another 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.

Jack interrogates a senator's chief of staff at the White House.

General Juma launches a direct attack on the White House, endangering Jack, Bill Buchanan and the president's daughter.

General Juma takes over Dubaku's attacks on America, and Jack tries to prevent a high-impact terror threat in the U.S.

Renee Walker receives key information once again, and Jack gets results from a meeting with his adversary, Sen. Blaine Mayer. Janis Gold and Larry Moss must deal with Morris O'Brian, while Moss tries to track Jack and Chloe faces charges of collusion.

The FBI ramps up its search for Jack when he's blamed for Sen. Mayer's death. Meanwhile, Jack and Tony hunt for a bioweapon at a shipyard, and Olivia Taylor's ambitious political decisions prompt calls for changes in her mother's administration.

The FBI collaborates with other agencies as theories linking Starkwood and Sangala begin to emerge and thousands of lives are placed in jeopardy.

Jack and the FBI work on a strategy to ward off further terror attacks, but a surprising turn of events occurs when the politics of the administration unfold beyond the White House.

Tony Almeida operates in the field as Hodges and Starkwood plan their attack with a biological weapon. Meanwhile, Jack's daughter, Kim (Elisha Cuthbert), returns, and Taylor's administration faces a blackmail attempt.

Jack's pain from the pathogen significantly increases, but he's determined to endure it. Meanwhile, the FBI investigates some lethal developments.

The pathogen crisis continues, and Jack Bauer interrogates a key suspect.

The pathogen is still in dangerous hands, and the White House is divided. Meanwhile, Chloe gets emotional as conditions decline.

Jack's daughter, Kim, is in harm's way, and the continuing terror threat fuels the rivalry between Chloe and Janis.

Cara orders Jack to rescue Tony. Meanwhile, Kim's trailed by an operative at the airport.

In the final hour of Season 7, Jack and Renee see that Tony's actions may not have been totally treacherous but aimed at destroying a greater evil. Meanwhile, President Taylor must choose between justice and family.

Jack is drawn back into the homeland-security business when Middle Eastern leader Omar Hassan comes to the U.S. on a peacekeeping mission as the eighth season opens in New York.

Jack works with CTU after meeting up with an operative who has information on a planned assassination.

Hastings ignores a lead that Chloe develops but Jack follows it, and Ortiz and Walsh wonder whether Hastings is dropping the ball and Jack and Chloe are on the right track.

The plot to assassinate Omar Hassan is set into motion.

Jack reteams with agent Renee Walker (Annie Wersching), and President Taylor learns of a larger threat to the fragile peace process.

Renee Walker must broker a deal with a ruthless arms dealer, which stirs up some ghosts for her. Meanwhile, Chloe gives Arlo Glass his comeuppance; and turmoil in the Hassan family jeopardizes the peace process.

Renee works undercover on a mission concerning Vladimir, but Jack thinks it's too dangerous. Meanwhile, President Taylor seeks answers from President Hassan; and Dana tries to get her ex-boyfriend into a police warehouse.

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

President Taylor tries to push the peace process forward, but the possibility of massive failure looms, prompting some to look for scapegoats.

A tense meeting between President Taylor and Omar Hassan takes an unexpected turn when Jack closes in on a person of interest amid the backdrop of Hassan-family turmoil.

A key person at CTU is demoted, and struggles to handle the change. Meanwhile, an annoying parole officer makes an appearance.

CTU faces a hostage situation; unforeseen developments rock the Hassan family; Bauer and Ortiz work together in the field to protect New York; parole officer Prady continues his investigation.

The NSA intervenes in CTU's operation; Chloe and Dana make dramatic contributions; and Jack leads field agents on a dangerous mission.

President Taylor's idealism is criticized as the threat of attack undermines her vision for global peace. Meanwhile, Taylor gives Jack a crucial assignment, and adviser Ethan Kanin returns to her staff.

President Hassan makes a decision that shocks his family. Meanwhile, Jack alerts President Taylor about Weiss; and Jack begins to think that there is a mole inside CTU.

A traitor makes a deal for immunity. Jack and Rene then race uptown to rescue a hostage, while President Taylor looks into contingency plans in case things end badly for the hostage.

Gregory Itzin returns to the cast as Charles Logan, the former president we loved to hate, and he insinuates himself into President Taylor's moribund peace process. Meanwhile, a rare emotional move by Jack sparks catastrophe; and Chloe is given new responsibilities at CTU.

Jack is out for revenge, and President Taylor has mixed emotions as the peace process moves forward, but with former President Logan as a player at the negotiating table.

President Taylor enlists a private security firm led by Mark Bledsoe to assist in the crisis, and Jack calls in a marker from old friend Jim Ricker during a crucial mission.

Jack is hell-bent on avenging the loss of his partner, Renee Walker, and President Taylor fights to keep the fragile peace process alive.

Jack Bauer goes rogue to discover who's behind the day's despicable events.

With three hours to go, Jack's mission makes life difficult for President Taylor as she prepares for a signing ceremony. Meanwhile, Chloe leads CTU on a collision course with Jack; and President Logan meets a formidable foe.

Dalia learns the truth about her husband's assassination and won't sign the peace agreement. Meanwhile, Jack uses Pillar to gain access to the UN and readies to assassinate the Russian president.

In the Season 8 finale, President Taylor focuses on the peace treaty to the exclusion of all else; and Jack takes matters into his own hands.

Another eventful day in the life of Jack Bauer begins with the heroic agent-turned-fugitive in a race against the clock to save the world while simultaneously staying on the run from the CIA. Set four years after the "24" finale, the series opener finds Jack putting his freedom on the line by coming out of hiding in London to try and prevent a major terrorist attack.

Jack and Chloe struggle to elude the CIA's grasp while searching for a rogue hacker named Derek Yates; Audrey and Mark worry that President Heller could be suffering from dementia.

Kate's hunt for Jack continues as President Heller prepares to address Parliament after a devastating attack. Elsewhere, Margot Al-Harazi demonstrates how much she is willing to sacrifice for revenge.

Terror threat concerns are escalating as the CIA closes in on Jack while he makes his way to the U.S. Embassy; President Heller delivers an impassioned speech to Parliament; Margot asserts her authority; and Kate takes matters into her own hands.

An impending attack brings two unlikely people together to stop it; Margot makes her demands known; and President Heller's order for a military lockdown may be too late.

Tensions between President Heller and Prime Minister Davies boil over, until one of them decides to take matters into his own hands. Meanwhile, Jack has a plan for tracking down Margot, but it involves using someone unexpected—and unsuspecting—as bait; and back at the CIA in London, Jordan raises suspicions about Kate's husband.

President Heller tries to stop Margot from going through with any further attacks, while Jack and Kate race to save the life of a key player in the terror plot, and Jordan is ordered into the field on a perilious mission.

Jack and President Heller put themselves through hell in order to stop Margot Al-Harazi from going through with any more attacks; at the same time, Kate takes drastic measures to find Margot's hideout, while Jordan finds himself in a life-or-death situation.

True colors are revealed in the midst of some very intense circumstances. Meanwhile, Jack and Chloe launch a plan to eliminate the terrorist threat and keep London safe from any more attacks, but to do so first he and Kate need to track down some crucial leads with little time to spare.

Jack remains laser-focused on pursuing his remaining leads; emotions escalate when Kate learns the truth about her husband; and Audrey confronts Mark about the duplicitous things that he has said and done. At the same time, the terror threat widens and the potential devastation becomes all too clear.

Jack leads Kate and Mark on a mission to avert an international crisis, as Audrey tries diplomatic means to avoid full-scale war.

The day comes to an end with Jack doing everything in his power to prevent a terror plot and an international crisis. But to save the world, he's faced with an unthinkable and grave decision.