Jack and Nina prepare to meet with Amador, the man selling the virus; CTU organizes an ambush. Ramon and Hector have a falling out. President Palmer asks his ex wife Sher ...

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 sta ...

A snag in the sale of the virus leads the Salazars to question Jack's motivations and as a result they put his allegiances to the test. Claudia works to help Chase escape ...

Jack tries to regain the Salazars' trust when they make it to Mexico. President Palmer is angry with Tony over being left out of a secret operation. Chase is captured by ...

Ramon holds Jack hostage as they fly down to Mexico. Regional Director Chappelle interrogates Gael; Tony returns prematurely to CTU to reveal Gael's true allegiance. Chas ...

Jack and Ramon try evade military helicopters when they make a run for a plane scheduled to leave for Mexico. Palmer cancels the debate. Kyle Singer learns that he is not ...

Jack and Ramon are captured by dangerous prison inmates after trying to escape. President Palmer begins his debate with Senator Keeler. At CTU, Chloe O'Brian discovers ev ...

Jack asks for President Palmer's permission to go deep undercover and get Ramon out of prison after CTU looses track of Kyle Singer. While Jack prepares to get Ramon out ...

Tony and one of Salazar's cronies close in on a young drug trafficker who may be unknowingly carrying the virus. Jack informs Kyle Singer's parents that he may be infecte ...

An hour after an infected body is dropped off at the CDC Jack and Chase begin to trace its last known locations while CTU tracks down drug dealers in East LA. President P ...

Three years later; CTU receives a threat that Mexican drug lord Hector Salazar is planning on releasing a deadly contagious virus in LA unless Jack gets his brother Ramon ...

Jack and Sherry head to LA Coliseum to meet Peter Kingsley. Upon hearing evidence via the live audio feed, President Prescott aborts the air strike. David Palmer is reins ...

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 Pr ...

Jack discovers that Shery Palmer is somehow involved in the conspiracy when he tries to talk to Alex Hewitt. Tony and Michelle make a critical decision on how to handle t ...

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-Preside ...

Jack tries to escape from Kingsley men. Lynn Kresge tries to warn the President about the conspiracy. Regional Director Chappelle return to CTU. Kate buys herself more ti ...

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-Preside ...

Jack, Kate, and Yousef try to get Wallace to a hospital after he gets shot by unknown assailants. President Palmer tries to deal with civil unrest as Muslim communities a ...

Jack and Kate leave CTU to meet with the lone surviving member of the Coral Snake Commandos who says he has evidence that the tape is fake. President Palmer wants to wait ...

Jack gets back to CTU after the bomb exploded. The situation there is tense since Tony became head of the Unit, especially when a key witness is assassinated. President P ...

Jack must deal with the nuclear bomb at the airport. CTU discovers a recording implicating that Sayed Ali is supported by three presidents of Middle-Eastern countries. ...

Jack and Kate try to get Marie to reveal the exact location of the bomb in the airfield. Mason steps down as Director after his condition worsens. President Palmer confro ...

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 L ...

Jack tries to get information out of Syed Ali. Mason gets Bob Warner to reveal some previously classified history on Marie that paints Reza's murder in a new light. Lynne ...

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 inte ...

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 ad ...

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 ...

Jack and Nina try to get more info about the bomb from her Visalia contact on the way back to LA. Tony learns of Bob Warner's status as a CIA contractor. Stanton expresse ...

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 e ...

Jack takes charge of the Nina Meyers interrogation after she demands a Presidential pardon. President Palmer not only has deal with the crash of the ambassador's helicopt ...

Mason and Jack prepare to interrogate Nina Meyers when they learn she gave Wald access to CTU. Tony goes to the Warner household to check up on Reza's possible connection ...

CTU is attacked and faces serious casualties. After deposing Joseph Wald's domestic terrorist group, Jack learns who gave Joe the schematics for CTU. President Palmer fir ...