Director Green and Regional Director Ryan Chappelle question Jack about the day's events. Nina takes Kim and Teri to a safe house after getting them medical attention. Palmer wants a meeting with Jack.

Palmer and Jack finally meet for the first time and discuss Operation Nightfall. Nina talks to Teri about her and Jack's past relationship after they reach the safehouse.

Jack is captured by Victor Drazen and Andre when they escape the detention center. Palmer learns he is dominating the California polls. Drazen's men capture Kim after she is released from jail.

Jack is captured and tortured by men who want the chip. Kate and Yusuf run into a group of angry rednecks before they can deliver the chip to CTU. Tony and Michelle share a tender moment after her brother flips out. Palmer leans towards holding off the attacks, while Lynne discovers a secret operation that the Vice-President is planning against Palmer.

Jack finds an ally who may help him escape from Kingsley's men. Lynne meets with foul play before she can warn Palmer of the conspiracy against him. Chappelle interferes with Tony's efforts to assist Jack. Kate offers her captors money in exchange for the chip.

Palmer's cabinet invokes the 25th Amendment in an attempt to remove him from power. They place him on trial for his extreme actions during the nuclear bomb threat. Jack and Michelle work against the clock to prove that the evidence against the Middle East is false.

Jack locates the man who forged the audio evidence, but his efforts to break him down are sabotaged by Sherry Palmer, who has a hand in the conspiracy. Kim returns to the Matheson home, where she discovers that her problems are far from over. Palmer searches for an ally who will help him get a message out to CTU. Tony and Michelle take Chappelle out of action when he hinders their efforts to help Jack.

When Jack hits a dead end with his lead, he realizes he must persuade Sherry to help him get evidence against Kingsley. Things go awry at CTU when Division becomes suspicious of Chappelle's absence. Michelle goes off-site to work with Jack. Mike and Prescott ask Palmer to aid them as the bombers get closer to their targets.

Jack and Sherry Palmer prepare for a dangerous meeting with the head of the war conspiracy at the L.A. Coliseum; David Palmer sits in as the Cabinet waits for confirmation of the Cypress Chip's invalidity; the air strike on the Middle East draws nearer; the conspiracy goes to an old agent to put Palmer out of play.

Jack and Ramon struggle to evade the authorities, while Palmer must shut the debate down because of the prison break.

Kim accidentally stumbles on to Gael's secret communications, but she isn't able to warn Michelle in time.

The Singer family learns a startling piece of news about Kyle's health.

Ramon holds Jack hostage as he flies to Mexico. Ramon plans to kill Jack, but Jack manages to hold him at bay until the plane lands. Ramon then learns that Jack and Hector are working together to break him out of prison.

Gael is captured while trying to escape from CTU. Chappelle interrogates Gael but is interrupted by Tony, who claims that Gael is part of a bigger plan.

Anne is given a chance to clear Palmer's name, while Chase heads for Mexico to rescue Jack.

Palmer and Chappelle view a message from Jack, explaining his undercover work with the Salazars. Meanwhile, Hector tries to convince Ramon that they should deal with Bauer so that they can get their hands on the virus.

Jack has a private moment with Claudia and she blasts him for leaving her behind when he arrested Ramon.

Chase arrives in Mexico, but is captured by Hector's men. Ramon devises a way for Jack to prove his loyalty to them.

Anne manages to clear Palmer's name, but she breaks off her relationship with him.

Palmer clears Anne's name with the press, but he finds that he is facing a new problem when his biggest campaign contributor reveals a startling secret about Wayne.

Kim and Michelle worry about Tony's mental ability when he continues to make mistakes.

Jack and the Salazars meet with Amador, but the deal turns sour when Nina Myers appears on the scene and competes for the virus.

Claudia manages to free Chase from his captors, but she pays a high price for her efforts.

Wayne turns to Julia, while Palmer calls on Sherry for help against Milliken.

Jack and Ramon make plans to get to Nina, in the hopes of intercepting the virus.

Chloe's work at CTU is disrupted when she is forced to take care of her baby.

Jack forces Nina to work with him to get the virus from Amador.

Palmer meets with Sherry and convinces her to help him deal with Milliken.

Chase remains in Mexico to help with the capture of the virus.

Ramon and Hector quarrel when Hector wants to pull out of the deal.

Jack and Chase interrogate Nina, but the worm turns when she causes havoc with the CTU computer systems.

Chappelle puts Chloe under guard when she refuses to answer questions about the baby, but is forced to release her when she is the only one who can deal with the crisis.

Sherry takes her battle directly to Alan, forcing Julia to act as her accomplice.

Tony interrogates Nina about Alvers' location, while Chappelle orders Jack to undergo a medical examination in light of his drug use.

Kim and Chase have a conversation about the baby.

Palmer confronts Sherry about Alan Milliken's death, while Julia begs Wayne for help.

Chappelle threatens to pull Jack from the investigation for killing a material witness, but Jack persuades him to hold off when they find a fresh lead on Amador's whereabouts.

Amador and Alvers meet with the man who is planning to unleash the virus in LA within the hour.

Michelle and Gael locate the target area, but things really hit the fan when they attempt to capture Alvers in the process of releasing the virus.

Wayne argues with Sherry over the consequences of Milliken's death as the police turn up the heat on Julia.

Jack and Chase track Amador in the hopes that he can lead them to the man behind the virus attack.

Michelle faces a mob riot when the hotel is quarantined.

Sherry extorts Palmer, forcing him to manufacture her alibi for the police.

Saunders begins making demands on the President. He forces Palmer to hold a strange press conference and then orders the death of the CTU agent who can trace him.

Jack learns of a woman who can lead him to Saunders, but a surprise attack shifts the balance of power.

As Gael's symptoms get worse, Michelle devises a way to relieve the suffering of the victims at the hotel.

Jack and Chase race against time to capture Saunders before the deadline, while Chappelle plans an escape.

Michelle begins a frantic search when she learns that an infected hotel guest may have slipped through her fingers.

Jack reluctantly works with Kim on an undercover job that may help them gain an advantage over Saunders.

Palmer informs his cabinet of the crisis, while Saunders makes yet another demand.

Chase tracks down the man who left the hotel and learns that the virus is spreading to the general public.