When terrorists threaten to detonate a nuclear bomb in Los Angeles, President Palmer calls very reluctant CTU agent Jack Bauer back from inactive status.
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Jack returns to the CTU and lobbies to be allowed to interrogate Nina; Palmer exchanges security information with a middle eastern Ambassador; Tony questions Reza; and Kim tries to figure out how to save Megan.
Nina helps Jack get information from Faheen; the drivers of the bomb van run into problems; Kate searches her father’s computer files; Sherry offers to help Palmer with the reporter he’s sequestering, Kim is arrested for Carla’s murder.
Jack and Nina’s plane crashes; Tony discovers Mason’s secret; Mason pits Reza against Bob to discover which of them has ties to the terrorist; Palmer thinks about out how to deal with Weiland's news broadcast.
Palmer helps Jack get away from Nina; Jack learns the commandos who attacked him may have been sent by the NSA; Kim and Miguel try to get away from the police; Mason sinks into nostalgia as his time grows short; Reza helps CTU agents search Bob’s computer files.
Jack joins Michelle in trying to prove the authenticity of Ali’s incriminating recording before Palmer can launch World War III; Kim is involved in a scuffle at a convenience store that signals the beginnings of mass panic at the bomb blast.
Jack joins forces with Yusuf and turns Kate over to the missing Coral Snake commando; Kim escapes the convenience store; Palmer refuses to go ahead with his war plans until he gets Jack’s ruling on whether or not evidence against the three Middle Eastern countries is genuine.
A team of commandos goes after Jack to get the data chip containing evidence about the faked recordings; the plot among Palmer's staff is finally revealed; Michele reveals the source of the tensions between her and Carrie.
When Jack’s plans to return Alex Hewitt to the CTU fail, he turns to Sherry Palmer for help; Tony and Michelle are caught trying to help Jack; Palmer helps Prescott secure Turkish airspace for U.S. warplanes.