Four years ago, Jack was a fugitive from justice. Now an exile, he nevertheless is willing to risk his life and freedom to avert yet another global disaster. Tracking Jack are CIA head Steve Navarro; CIA agent Kate Morgan, who is both resourceful and ruthless; Jordan Reed, a smart and sophisticated CIA computer tech; and Erik Ritter, a sharp, strong and arrogant field operative. Calling the shots is James Heller, now President of the United States. Heller is flanked by his Chief of Staff Mark Boudreau, who is married to Heller's daughter - Jack's former flame, Audrey. Meanwhile, a hardened Chloe O'Brian, Bauer's CTU confidante, is now working underground with high-profile hacker Adrian Cross.

Four years ago, Jack was a fugitive from justice. Now an exile, he nevertheless is willing to risk his life and freedom to avert yet another global disaster. Tracking Jack are CIA head Steve Navarro; CIA agent Kate Morgan, who is both resourceful and ruthless; Jordan Reed, a smart and sophisticated CIA computer tech; and Erik Ritter, a sharp, strong and arrogant field operative. Calling the shots is James Heller, now President of the United States. Heller is flanked by his Chief of Staff Mark Boudreau, who is married to Heller's daughter - Jack's former flame, Audrey. Meanwhile, a hardened Chloe O'Brian, Bauer's CTU confidante, is now working underground with high-profile hacker Adrian Cross.

As the hunt continues for Jack Bauer, the terror threat is intensifying, much to the chagrin of the CIA and Kate Morgan. Across town, President James Heller prepares to address Parliament in an attempt to heal recent wounds with the British, and to preserve his legacy. Meanwhile, Margot - a homegrown British terrorist seeking to avenge her husband's passing - proves she is willing to make any sacrifice for her mission.

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.

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.

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.

Following an intense and deadly shootout, Jack and Kate are in a race against time to save the life of a key player tied to the imminent terror threat. Meanwhile, Jordan Reed is ordered into the field on a perilous mission. Then, after President Heller engages Margot to end her savage attacks, he faces an unthinkable, game-changing decision.

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-passing struggle and Kate takes drastic measures to track down Margot before it's too late.

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.

With only three episodes remaining, 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.

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.

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.