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Jack takes Ted Cofell hostage after finding his name on the key-card and tries to get whatever info he has about the conspiracy which only amounts to the name of another conspirator, a one Kevin Carroll. Palmer starts to piece together his connection to Jack. Gaines receives orders to kill Teri and Kim from his boss Andre Drazen.

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 has a final confrontation with Gaines as a CTU chopper heads to the compound. Nina and Tony talk to Jamey's mother in order to learn why she was helping the assassins. Carl Webb threatens Palmer to keep quiet about the murder once and for all. CTU learns that more assassins are on their way to LA.

Jack thinks he's identified the mole inside CTU. Kim and Janet realize they are being kidnapped and try to escape. Palmer orders an employee to get dirt on a reporter who might jeopardize his campaign. Ira Gaines' plans come to a halt when he must renegotiate with a conspirator.

After handing out photos of all the assassins, Jack and Mason discover that one of Palmer's campaign staff is in a romantic relationship with Alexis Drazen. Teri and Kim are attacked in the safehouse. Keith confronts Carl Webb about the cover-up.

Jack and Mason search for location of the address found in Victor Drazen's confidential file. Palmer finally lets the press know about Keith's past. One of Drazen's goons closes in on Teri; Kim is arrested after the police raid Rick's house.

Jack is on the run after escaping custody and rushes to intercept Ted Cofell before he leaves the city. Nina receives a phone call from Teri and tries to trace the call. Palmer still wants to go ahead with the press conference despite objections. Alberta Green temporarily takes over as Director of CTU.

Jack sends out a warning that CTU is the target of a terrorist attack. Director Mason leaves CTU to personally check up on a lead on the nuclear bomb's location.

CTU is attacked and faces serious casualties. Jack discovers who gave Joseph Wald the schematics for CTU. President Palmer fires Rayburn after Kresge tells him about the 30-minute gap between Jack's warning and the bomb explosion.

Mason and Jack make preparations to interrogate an old enemy who gave the terrorists access to CTU. Tony goes to the Warner household to check up on Reza's possible connection to Syed Ali.

Jack takes charge of the Nina Meyers interrogation. Sherry returns with information on the conspiracy against President Palmer.

Jack is captured by a group of men working for an oil magnate named Peter Kingsley who's looking to capitalize on the coming war. Lynne Kresge discovers that Vice-President Prescott is planning on seizing the presidency by way of the 25th Amendment. President Palmer deals with some increasingly impatient Joint Chiefs of Staff. Kate and Yusef are attacked by angry American citizens when they try to get the chip behind the Ali recording back to CTU.

Jack boards a plane with Nina Meyers and several FBI agents because they have to meet a contact in Visalia,California who has info on the bomb's location. Nina tries to escape after meeting the contact. President Palmer and Mike Novick try to ascertain NSA Director Stanton's loyalty. Mason tries to make contact with his estranged son. Tony takes Bob Warner and Reza to CTU for further questioning.

Jack tries to escape from the Kingsley's men after being tortured. Lynn Kresge tries to warn President Palmer about VP Prescott. Regional Director Ryan Chappelle returns to CTU and exerts his authority. Kate tries to retrieve the stolen computer chip. President Palmer begins to suspect something is wrong when Prescott won't return his phone calls.

Jack and Nina try to get more information out of her contact on the way back to LA. Tony learns of Bob Warner's status as a CIA contractor. Stanton expresses concerns about Sherry's presence as she tries to make a deal with a detained reporter.

After saving Kate from her attackers Jack heads to meet Alex Hewitt who may be the person who designed the computer chip. President Palmer's ability to the run the country is questioned when the Vice-President and members of the cabinet invoke the 25th Amendment.

The plane carrying Jack and Nina is shot down and together they must fight off a group of soldiers. Mason plays Bob Warner against Reza to find out which one working with the terrorists. Kate Warner is captured and interrogated by Syed Ali. Mason reveals the truth of his condition to Tony.

Jack is captured by Nina Meyers and used as leverage in an attempt to get a presidential pardon. President Palmer learns the identity of one of the conspirators in his administration. After being set free, Reza learns the identity of the person who set him up when he goes to get incriminating evidence on Bob. Jack begins to suspect the soldiers who shot him down were with the NSA as he heads to capture Syed Ali.

Jack has Sherry contact Peter Kingsley who turns out to be the mastermind behind the tape. Mike Novick realizes that he has made a huge error in judgment in supporting Prescott. Deputy Regional Director Brad Hammond places Tony and Michelle under arrest.

Kate Warner leads Jack on mission to locate and ID Syed Ali. President Palmer places Stanton under arrest and makes an out of character decision on how to handle the interrogation. CTU discovers that Marie killed Reza and the two agents trailing him.

Jack discovers the bodies of six additional Coral Snake Commandos as a Tactical Team gets closer to the bomb's location. Division sends in Brad Hammond to look into CTU LA's situation. Stanton finally reveals that he has known about the bomb all along and allowed it be smuggled into the country.

Jack goes undercover to find Joseph Wald, where he learns that CTU is going to be bombed. While Kim tries to save Meghan from her abusive father, Gary. Kate Warner becomes suspicious of sister's Middle-Eastern fiancé.

In order to get closer to the virus, Jack tries to make Nina believe he still has feelings for her. Wayne tries to gain the trust of Julia Milliken when Alan Milliken starts making demands. Chase convinces Salazar's girlfriend to help him escape.

Jack and Chase corner Saunders' henchman Arthur Rabens in an active public school. Tony faces losing command of CTU and treason charges for saving Michelle. An emotionally broken President Palmer decides to drop out of the race for reelection.

Nina releases a deadly computer virus into CTU's systems after getting captured by Jack and Chase. Sherry runs out of options and decides to directly confront Alan Milliken but things go too far. Chloe and the rest of the tech crew work overtime to combat the virus.