A plot to assassinate the President of the Islamic Republic, at the U.N. building, comes to Jack Bauer's attention.
C.T.U. detains a reporter it suspects of helping assassins, while Jack and Chloe start their own investigation.
Jack and Chloe race against time to try to thwart a well-planned assassination of the President of the Islamic Republic.
CTU wants ex-FBI agent, Renee Walker, to infiltrate a Russian gang that's selling weapon-grade enriched uranium to the assassination plotters.
The Russians mistrust Renee, U.S.-Kamistan negotiations hit a snag, and the past of CTU analyst Dana Walsh becomes her nightmare.
Jack is set up, Renee makes a sacrifice, Dana sends her ex into a police warehouse, an arms trader deals with his sons, and the President buys time.
President Hassan's actions become paranoid and Dana's ex faces capture, while Renee and Jack kick open a hornet's nest among New York's Russian underworld.
While nuclear materials are en route to Kamistanis attempting a coup, Dalia confronts her father, Dana makes a decision, and Jack endures torture.
The White House wants a fall guy, Jack tries to protect that person, Dana goes after her ex, Cole follows her, and CTU gets help from an unlikely source.
President Taylor asks for President Hassan's help, Kayla goes missing, a New Jersey swamp claims two bodies, and Jack sets up a ruse to flush out Kamistani rebels.
A mother wants to save her son, an estranged couple reconnects to look for their daughter, and Jack races against the clock to dissuade a suicide bomber.
Nuclear fuel rods await transport into Manhattan, Jack pursues a lead to a hotel, Kayla is in danger, and a Southern probation officer wants information from Dana.
Chloe goes up against NSA testosterone, Jack and Cole are in a firefight as the nuclear fuel rods are en route to Manhattan, and an evacuation from the UN is imminent.
Kamistani rebels give President Taylor an hour to turn over Hassan, sedition strikes Taylor's administration, CTU harbors a traitor, and Jack walks into an ambush.
As dawn breaks over New York, President Taylor endures a game-changing setback as the threat of mass destruction looms. Meanwhile, President Hassan makes a shocking decision that surprises his loved ones. But before long, trusted confidantes will become enemies of the state, and it's only the beginning of the betrayals that are to come as the race against time ticks on.
A traitor makes a deal for immunity while Jack and Rene race uptown to rescue a hostage. The Russian ambassador asks President Taylor for news of Hassan.
President Taylor requests a woman's help and brings in a disgraced ex-President who may have leverage with the Russians; Jack and Rene take their leave of CTU, and Chloe gets a promotion.
President Taylor's envoy to the Russians persuades them to return to the peace table, but at what cost? Jack goes to CTU to interrogate a nearly-forgotten traitor, and the President decides to talk to Jack there.
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.
While the media interview the peace delegates, Jack and Cole have gone rogue to rescue a traitor being tortured by off-the-grid operatives; Logan gets President Taylor to approve putting his aide in charge of the manhunt.
While delegates review the peace agreement, Jack searches for evidence of Russian involvement in the day's tragedies, covered up at the highest levels. Ex-President Logan is desperate to neutralize Jack.
Jack's rogue operation includes kidnapping a high-profile target; pools of blood, a knife wound, and Chloe's mistrust of her new supervisor add texture while President Taylor feels the loneliness of power.
The Russian Federation President arrives to sign the accord, Jack wants justice, Logan stays in pursuit, Dalia has a realization, and President Taylor rattles her sabers. Chloe tests her mettle.
Heads of state gather at the UN to sign the accord, three at CTU make a final effort to expose a conspiracy, Logan and Pillar tie up loose ends, and justice may elude Jack.