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Jack and his daughter Kimberly continue to deal with the trauma of Teri's murder, and the effect it has on their relationship.

Jack rushes to reestablish his old undercover identity, but he is not welcomed back until he proves his loyalty with a shocking "gift."

Jack's undercover work pays off when he joins a deadly mission.

Jack turns the tables and finds a key to the nuclear threat, while CTU suffers a critical setback.

While CTU scrambles to recover vital information, Jack comes face to face with Nina.

Jack takes control of a prisoner and uses strong-arm tactics to try and get key information. Meanwhile, Sherry Palmer, now the ex-wife of President Palmer, makes her return; and Tony interrogates Reza about his business with a known terrorist.

Jack takes Nina on a plane to Visalia as they make plans to raid the building housing her terrorist connection.

While Nina and Faheen are brought together, Jack and Michelle must try and decipher their conversation in Arabic for any clue to where the bomb is located.

Nina looks for a deal from President Palmer to protect her from Jack.

Nina tries to turn the tables on Jack before he can get revenge; President Palmer tries to assure the country that the terrorist threat is well under control.

Jack takes Kate to a mosque to help identify a suspected terrorist; Palmer looks beyond the legal ramifications to possibly remove Roger Stanton from his NSA position; and Bob Warner turns violent while being held at CTU.

Jack goes to extreme, life-threatening measures while questioning a suspect. Meanwhile, Palmer continues the interrogation of Roger Stanton no matter how uncomfortable the process.

Jack and Kate discuss a situation in Marie's past.

Jack finally comes across an object that might be a crucial discovery.

Jack finally connects with Kim on the phone but has to deliver some devastating news. Meanwhile, Kate begins to feel responsible for Marie's terrorist actions.

Kim sees the mushroom cloud from the nuclear bomb in the far horizon and faces the certainty that her father is dead.

Jack takes Kate to meet the man who claims the Cyprus audio tape is a fake.

Jack must save Wallace from an attacking military force, so Wallace can provide evidence that will prevent an unnecessary war.

With Jack still on the hunt for proof that the Cyprus recording is a fake, President Palmer is torn between reducing U.S. military casualties by committing to a surprise or calling off the attack completely.

Jack's life hangs in the balance as he's tortured by Kingsley's men. They want the computer chip that will prove the Cyprus recording is a fake. Meanwhile, Chappelle orders Tony to continue processing intel to support a military attack.

When Jack finally takes possession of the computer chip, Tony and Michelle struggle to access the chip's audiofiles in time to prevent a war.

Jack finds the man who forged the Cyprus Recording, but encounters resistance to bringing him in. Meanwhile, after Chappelle makes a major announcement at CTU, Tony puts his career on the line to help Jack; and Palmer wins over a critical ally.

Jack attempts to deliver the one person who can help to prevent the military attack now close at hand.

Jack must persuade an unexpected source to help him take down Peter Kingsley.