CTU’s satellite tracking system is compromised as a bomb-carrying drone heads toward an unknown city. Meanwhile, US forces prepare for a nuclear retaliation on the Middle East.

Family troubles: Jack with his brother and father while Morris worries about his own brother.

The President meets with a known terrorist, while Jack searches for Morris, Fayed seeks a trigger, and Tom Lennox makes a choice.

A new U.S. President has negotiated Jack’s release from a Chinese prison so Jack can stop a series of terror attacks… with his life.

Can Jack and an unlikely ally stop a suicide bomber and track the architect of these acts of terror?

Mike pushes for the Vice-President to be sworn into office as the White House waits for news of Keeler’s fate. Two innocent bystanders are dragged into the fight as Jack…

Curtis brings in a suspect who has critical information about Marwan’s next strike. Michelle orders Curtis to use harsh methods to interrogate the suspect, but things get complicated when Marwan…

Mandy uses Tony as leverage to try to force Michelle to aid in her escape. A Chinese security operative captures and interrogates one of the CTU agents involved in the…

As the missile speeds toward its destination, Mandy cuts a deal with Jack and the President to give up Marwan’s location in exchange for a full pardon on all of…

Jack and Driscoll agree to work together when the police make a critical error in dealing with Kalil. Heller and Audrey take drastic action in the hopes of avoiding the…

Jack initiates a fierce gun battle with the terrorists as he races to rescue Heller and Audrey before the military strike begins. Dina questions her own dedication to their cause…

Jack and Curtis finally learn the location of the override device. They try to trap the architect of the terrorist strike before the remaining nuclear plants go critical. Tony pushes…

Jack and Paul visit the defense contractor who employed Marwan, but the company executives put their own interests ahead of CTU’s and take major steps to destroy evidence. After a…

Eighteen months have elapsed since the conclusion of Day 3. A commuter train bound for Los Angeles explodes. A man steals a suitcase from a passenger in the wreckage and…

Jack pushes Driscoll to reinstate him in the wake of Heller’s kidnapping. He finds himself working as a subordinate when the Field Ops team goes to pick up Andrew. Behrooz…

Jack and Henderson wage an assault on the submarine as Bierko prepares to launch an attack against L.A. Chloe brings in someone from her past to aid her. Martha and…

Jack takes his fight directly to the President as he attempts to force a confession from him that will prove his involvement in the day’s events. Martha vents her hatred…

Jack and Wayne locate a source inside Logan’s administration who has information on Palmer’s assassination. But things get complicated when they learn that Henderson is using leverage to keep her…

Jack interrogates Henderson’s wife about her husband’s connection to the terrorists. Lynn begs his sister to return his stolen keycard, while Tony regains consciousness and learns of Michelle’s fate. Martha…

Jack takes Henderson to CTU for questioning. Once there, he faces an unhappy reunion with his daughter, Kim. Mike appeals to Martha for help as Logan faces pressure from his…

Jack pushes Audrey for answers when evidence indicates that she may be involved with the terrorists. Wayne and Aaron flee from a group of gunmen who have orders from Henderson…

Jack and Chloe infiltrate Wayne Palmer’s penthouse where David Palmer was assassinated, in the hopes of finding a clue to his murder. Jack convinces Wayne to cooperate and finds some…

Jack returns to CTU and has an emotional reunion with Audrey, while Curtis tracks the Russians and the stolen nerve gas. Walt sends in a hit man to silence Jack….

Jack contacts Mike and asks for a secret meeting in hopes of gathering evidence against Walt. Martha begs Aaron for help, while a desperate Walt tries to force Logan to…

The Russian and US Presidents are set to sign an anti-terror treaty when assassinations rock Los Angeles, a call from a distressed Chloe forces Jack into action and President Logan’s…

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…

Jack attempts to use Saunders’ daughter as leverage to gain control of the virus, while Palmer must deal with the discontented press. Michelle gets the results of her test, while…

Jack pushes the envelope in an attempt to force Saunders to disclose the location of the missing vials. Sherry meets with David to discuss her terms, while Wayne breaks into…

Jack and Chase must make a powerful sacrifice when dealing with the virus. Tony is able to help Jack one last time before he is taken into custody, while an…

Things finally come to an explosive head as Jack, Ramon, Nina and Chase all close in on the virus. But the deal takes an unexpected turn when Amador pulls a…

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…

Three years have passed since the events of Day Two. A van deposits a dead body outside the LA Health Unit. The body is infected with a deadly virus. Tony,…

Jack and Chase quarrel over Chase’s relationship with Kim. Meanwhile, they learn of a lead to the possible whereabouts of the virus after raiding a crack-house. Linda breaks up with…

Jack’s efforts to break Ramon out of prison go awry when they are captured by a group of inmates during the riot. Chloe unwittingly stumbles on to Jack’s drug problem…

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…

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…

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…

Jack meets with the surviving Coral Snake Commando, who demands Kate Warner in exchange for evidence about the recordings. Tony and Carrie spy on Michelle when he suspects that she…

Jack, Kate and Wallace fight to escape from a deadly band of commandos. Palmer decides to take a stronger stance against the civil unrest resulting from the bomb explosion. Tony’s…

Jack and his men prepare for a confrontation with Stanton’s renegade soldiers as they converge on the bomb. Kim becomes suspicious of her host, but is forced to stay because…