A train collides with a truck filled with explosives. A man is shot. Over the phone, Jack Bauer hears the screams of his kidnapped sweetheart.

Jack is in trouble with his supervisor, and he's on the trail of a killer.

Jack trails a suspect while his supervisor has ordered C.T.U. to bring both of them in.

Jack creates a faux-hostage crisis in a convenience store trapping Kalil and several innocent bystanders to buy Chloe more time to get the surveillance satellite working properly. Dina murders Behrooz's girlfriend after she become...

Jack and Director Driscoll agree to a truce and work together after the police make a mistake in handling the Kalil situation, which means that Jack also has to find a new lead. The terrorists begin to threaten Audrey unless Helle...

Jack initiates a fierce gun battle with the terrorists as he races to rescue Audrey and Secretary Heller before the military strike. Dina is shocked to learn that Navi and Marwan plan to have Behrooz killed. Secretary Heller learn...

Jack takes Audrey into the field in order to ID a suspect she recognizes from the compound, but the terrorists learn where they are and pin them down. Jack calls on an old friend to escape. Dina tries to get to Behrooz before Navi...

Jack and Audrey hide out with Tony Almeida after escaping from the terrorists and learn the man they are looking for is an employee for McClennan-Forrester. Behrooz takes Dina to the hospital to get medical attention. President Ke...

Jack and Tony stumble on to Dina and Behrooz's trail after a key suspect has been assassinated. Edgar tries all he can to get his mother out of the fallout zone of the San Gabriel Island nuclear power station. Driscoll and Curtis ...

Jack races to save Behrooz from his father when the situation turns into a hostage crisis. Dina points Jack and Tony to a safe-house where they find evidence that points to Paul Raines' involvement with the terrorists. Marianne le...

After finding out that Audrey's husband, Paul Raines, may have information about the override, Jack decides it's time for some "shock treatment". The lead that Curtis was following up on at the Rockland Building proves to be vital...

Jack and Paul Raines visit the corporate headquarters of McLennan-Forster, the defense contractor that employed Marwan. The company executives activate an EMP bomb to destroy incriminating evidence in order to protect themselves. ...

Jack and Paul enlist civilian help when they must fend off mercenaries from McLennan-Forster. Tony discovers that Michelle is taking over command of CTU. Marwan orders an underling to kill an Air Force pilot and his family and ass...

Jack and Dina's attempt to infiltrate one of Marwan's terrorist cells backfires on them. Michelle orders Chloe back to work when Edgar begins to crack due to emotional pressure. Paul is taken into surgery after getting shot. Ander...

In order to buy more time for Anderson to close in on Air Force One, Marwan calls CTU and tells Michelle that he is willing to trade Jack for Behrooz. Bill Buchanan arrives at CTU and assumes command. Curtis interrogates Behrooz f...

CTU raids Marwan's headquarters, but somehow allow Marwan to slip through their fingers in the confusion. Jack learns that the trade-off was nothing more than another ruse. Jack tries to talk Anderson out of the mission, but it is...

Jack's only hope of keeping the President's nuclear football (a briefcase containing the codes of America's nuclear facilities) out of Marwan's hands lies in two innocent campers who witnessed the crash of Air Force One. Meanwhile...

Jack discovers that Marwan's new objective is to find and activate a nuclear warhead after he realizes pages from "the football" are missing. Logan's presidency is not off to a good start when he starts showing signs of fear. CTU ...

Chloe is sent into the field for the first time to look into the report of a woman who claims her boyfriend is part of the conspiracy. Mike Novick calls in Former President David Palmer to assist President Logan. Jack's methods ar...

Palmer authorizes an extraction mission on the Chinese Embassy in L.A, to be led by Jack and Curtis. The intended target is injured during the raid, and the Chinese Consul is shot in friendly fire by his own people. Jack forces th...

As Jack and Curtis close in on Marwan's location, Buchanan looks for an alibi when a Chinese representative investigates the raid on the embassy. Logan clashes with Palmer.

Jack fails to stop Marwan from launching the nuclear warhead. Richard Heller becomes a suspect again and James Heller leads the interrogation. Mandy takes Tony hostage after he checks up on Richard's information.

The Chinese representative kidnaps CTU Agent Howard Bern in an attempt to learn who led the raid on the embassy. Palmer and Logan may have to evacuate major U.S. cities in the hopes of preventing nuclear disaster, and Michelle tri...

Jack must hunt down Habib Marwan and stop the nuclear bomb that is nearing its target which is Los Angeles. The Chinese demand Jack after Bern's confession and President Logan makes a hasty decision on how to handle the situation.