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Jack Bauer investigates a plot to assassinate a United States senator.

Jack obtains an electronic card carrying information about Palmer; Teri and Janet's father search for the missing girls; Ira Gaines tries to obtain Belkins' ID card.

Jack verifies the key card was encrypted on Nina's computer; Gaines obtains Belkins' ID card from Mandy and Bridget; Kimberly and Janet flee their captors.

As Mason locks down the CTU, Jack checks out an address from the encrypted key card and Dan delivers Kimberly to Gaines.

Jack breaks Penticoff out of jail, hoping to learn what happened to Kimberly; Palmer learns why his son is being accused of murder.

Gaines contacts Jack to say he's holding Kim; Palmer considers his political future; the body in the car trunk is identified.

Gaines forces Jack to kidnap Nina; Teri tries to get away from York; Rick and Kim try to escape Gaines' compound; Palmer prepares to go public with Keith's story.

As Palmer's rally starts, the assassin gets ready to fire; Gaines positions Jack to take the fall for the crime; Nina and Tony figure out that Jamey is the in-house spy.

After being taken into custody, Jack escapes again; Nina and Tony try to get Jamey to confess all she knows; Teri sacrifices her honor to save Kim's.

Nina tries to help Jack locate Teri by tracing her phone call; a new boss takes over the CTU; Palmer learns Carl may be out to kill Keith's therapist, who may accuse Keith of murder.

Jack kidnaps a businessman who may know something about Gaines; Drazen pushes Gaines to kill Teri and Kim; Palmer investigates Jack and tries to keep Carl from hurting anyone.

Green pressures Nina and Tony to reveal Jack's whereabouts; Jack is reunited with Teri and Kim at Gaines' compound; Palmer tries to protect Keith's therapist.

Jack, Teri, Kim, and Rick flee Gaines' compound; Green tells Nina and Tony to interrogate Jamey's mother; Palmer tries to figure out what to do in the wake of Ferragamo's death.

After the rescue from Gaines' compound, Jack is interrogated at the CTU; an assassin stalks Teri and Kim at a hospital; Keith pressures Palmer to report Ferragamo's murder.

Palmer and Jack figure out why they're being targeted; Nina debriefs Teri and Kim at a safe house; assassin Alexis reveals his connection to Drazen.

Drazen's men find Teri and Kim at the safe house; Jack and Palmer learn about Elizabeth's affair with Alexis; Keith and Carl threaten to blame each other for Ferragamo's death.

Jack uses Elizabeth as bait to trap Alexis; Teri suffers amnesia and searches for familiar places; Kim contacts Rick for help; Keith begs his father to go public with Carl's dirty tricks.

Jack pretends to be Alexis in a meeting with a possible source of information; Parslow tends to Teri; Kim gets stuck in the middle of a drug deal at Rick's house; Palmer prepares to go public about Carl.

Jack and Mason drive to Saugus to check out the lead provided by Morgan; Parslow takes Teri home; Kim gets caught in the middle of Frank's planned drug deal; Palmer confesses all in a press conference.

Jack finds a hidden government prison holding a secret prisoner; Palmer and Sherry's relationship is strained by his confessions; Kim is interrogated by the police.

Victor takes Jack hostage; Kim finally convinces the police her story is true; Palmer flirts with his speech writer, Patty.

Mason finally agrees to trade Alexis for Jack; romantic sparks continue to grow between Palmer and his aide, Patty.

Jack protects Palmer from yet another murder attempt, then spreads a false story that Palmer is dead; Nina and Tony worry about another 'mole' at the CTU.

After Kim escapes from the Drazens, Nina tells Jack that Kim is dead, and Jack attacks the Drazens; Palmer deals with Sherry's betrayals; Teri realizes Nina is behaving suspiciously.