Air date: 5/4/09
Jibraan, Tony's scapegoat, is coerced into helping Tony with the terrorist attack and take the blame for it after his younger brother Hamid, is threatened. Meanwhile, Chloe gets emotional when she learns of Jack's condition. Chloe helps the FBI using the CTU servers and manages to link a money trail to Jibraan, but is unable to find a valid address, yielding only the location of his mosque. Jack and Renee travel there "question" the Imam, Muhtadi Gohar; when he refuses to yield information, they take him hostage. Olivia arranges through a contact to have Jonas Hodges assassinated, but has a change of conscience and cancels both the transfer of funds and the operation. Hodges tells the guard watching him that "I am smell attitude, and your laying it on pretty thick." The guard then escorts to the transport car, that was rigged to blow, killing Hodges in a fiery explosion. Jack and Renee discover where Jibraan lives through local police who recognised him and head over to his address; Chloe further discovers that Jibraan has been framed, and Jack expresses regret for his haste, winning Gohar's respect. Jack leads a team to raid Jibraan's house and free Hamid, but are too late: Tony and his team have already left with Jibraan, and their one remaining henchman is wounded by Hamid during the raid. By this point, Tony and his team are in the final stages of preparing their attack - on the Washington Metro.
5:00 AM – 6:00 AM
Air date: 5/11/09
Jack and Renee race to locate Jibraan, who is being coerced into helping Tony to launch a bio-attack on Washington Metro. Due to some timely hacking by Chloe and Janis, Jack and Renee are able to locate Tony, ramming his van before capturing him. Despite their rivalry, Chloe and Janis also recover Tony's data which was damaged before it could be secured. With this they contact Jibraan, who helps them intercept the canister; he is reunited with his brother after Jack manages to isolate the canister before the bioweapon is released. Olivia meets with her contact, who reveals that he forced Hodges' murder through; she tries to cover her tracks, but Agent Pierce calls Ethan Kanin for help in accessing an electronic recording device in her office, with which he plans to uncover her misdealings. Finally, Jack is contacted and threatened by Tony's accomplice, Cara Bowden, who has a pair of operatives covertly shadowing Kim at the airport; Cara will have Kim killed unless Jack helps Tony escape.
6:00 AM – 7:00 AM
Air date: 5/18/09
Jack has no choice but to help Tony escape, but informs Renee of the nature of his betrayal. He and Tony break out of FBI custody and Jack is taken hostage: since he is infected with the bioweapon, the pathogen can be back-engineered from him. At the airport, Kim becomes suspicious about the couple she got acquainted with; while receiving her boarding pass, she receives a call from Renee warning her of the threat. Former chief-of-staff Ethan Kanin, recovers the audio recording which proves Olivia's involvement in Hodges' death. Olivia attempts to destroy the recording, but Ethan pulls a bait and switch, leaving Olivia with a blank recording. Back at the airport, FBI agents are closing in to save Kim and apprehend the hired accomplices; the man escapes, but Kim follows him, radios in his location, and singlehandedly secures the laptop he used to surveil her, which she, Chloe and Renee use to pinpoint Bowden's location. Tony continues to negotiate for a higher role with a major anonymous conspirator as he reveals his plan of launching another attack. Wilson says a face to face meeting with Tony "seems a bit, premature", but reluctantly agrees. Jack manages to escape from the doctors who were working to extract the pathogen from his body.
7:00 AM – 8:00 AM
Air date: 5/18/09
To locate Jack, Chloe tries to backtrack the communications from the operatives' laptop recovered by Kim at the airport. Meanwhile, Jack flees to a garage and attempts to escape — or, in lieu of that, immolate himself — but is recaptured by Tony. At the White House, Ethan reveals to Olivia her failure to destroy the audio recording. With Agent Pierce behind him, Ethan confronts Olivia and gives her the option of admitting the truth to her mother on her own. Alan Wilson, the mysterious man at the head of the conspiracy responsible for the terrorist attacks as well as Michelle's death, finally decides to meet Tony in person. Tony reveals to Jack that his plan all along was to get revenge for the death of his wife. As Wilson arrives and meets Tony and Cara, FBI agents invade the complex. Cara and Wilson flee from the scene, but Tony catches them. He kills Cara, but is prevented from killing Wilson by Jack and Renee. Before Jack and Renee intervene however, and just as he's about to shoot Wilson down, Tony reveals to Wilson the OTHER reason why he wants him dead - that in killing Michelle, he had also killed his unborn son. Wilson, now in custody, denies all involvement, prompting Renee to take drastic measures to keep him from getting away with his crimes. At the White House, Olivia confesses to her mother and father. As President of the United States, President Taylor decides she can't cover up her daughter's mess, much to the dismay of her husband. Jack's rapid health deterioration weakens him and, after turning to Gohar for spiritual guidance, he accepts his fate. Kim, however, decides she cannot allow him to die, and volunteers to undergo the stem cell procedure that could save her father's life.