The Best Episodes Written By Alex Gansa

A chat with Carrie's sister makes Saul suspicious. Seeing no other way to stop an imminent war, Carrie steels herself to carry out a plan against Saul.

Vincent is captured and held hostage by two scientists who stick him in a cage. Catherine considers a new job in Providence.

Father's past is revealed when he goes above for the first time in over thirty years to see a friend. When he gets to his friends office he finds his friend is dead. Father is then charged with murder.

Laura, a deaf-mute tunnel dweller, witnesses the murder of a police officer, for which another man is framed.

Paracelsus, a former friend of Father's, sells an hallucinatory drug in the world above.

Paracelsus kidnaps Catherine, which causes Vincent to begin a quest to rescue her.

Laura, a deaf ex-tunnel dweller, falls in with a deaf street gang.

Catherine's father dies and Vincent allows her to come below to grieve. He also makes her go back above because he knows that she does not belong there no matter how he feels. Catherine finally agrees and goes back above.

Catherine finds out while visiting Joe in the hospital that she is pregnant. As she heads to her car in the parking garage she is kidnapped. Due to Vincent's recent illness he can not sense where she is. He knows nothing of the child that she carries. The kidnappers lock her in a cell. They want only the child. They think that if they take the baby they will get Vincent to emerge and that is exactly what they want. They continue to hold Catherine captive as Vincent frantically searches for her. It seems completely hopeless without his sense of her. Yet he vows to find her no matter the cost.

Diana notices things in Catherine's apartment that have Vincent's name on them. She begins to realize that Vincent was her lover and probably the father of her child. She then decides to go to where Catherine is buried and wait for Vincent to do the same. One night it works. Vincent is sick and literally falls on top of Catherine's grave. Diana finds him and carries him back to her apartment where she nurses him back to health.

With only five hours left, the clock races toward the climactic series finale as Jack stops at absolutely nothing to avenge the emotional setback of losing his beloved partner Renee Walker. Meanwhile, the administration attempts to keep the historic and pivotal peace agreement on track as undermining forces surface.

The security breach has far-reaching consequences as Carrie and Saul get caught in an attack on their convoy and Haqqani's men infiltrate the embassy.

Saul must usher his group out of Russia without raising suspicions. Carrie and Anson race toward the U.S. Embassy. The new president is put to the test.

Buchanan takes Jack to "CTU", a secret hideout where he and Chloe had been working with Tony to uncover the conspiracy within the US government. Tony had been undercover with the terrorists aiding Juma to discover the moles. Jack agrees to help get Tony back in play by joining Emerson's crew himself. Taylor is forced to meet with Matobo to inform him that she may be required to withdraw her forces from Sangala to protect American lives. Her Chief of Staff Ethan Kanin agrees with this decision, but Taylor is not yet convinced. Henry meets with Samantha, Roger's former girlfriend, who tells him that Roger was indeed murdered and provides him with proof.

While Carrie is near catatonic and confined to bed, Saul investigates the unsettling implications of her timeline; Walker secures a perch for his mission; Brody makes his final preparations for the Vice President's policy summit at the State Department.

Carrie is faced with a pivotal decision, while Brody meets with Faber to contemplate the future of the family. Meanwhile, Saul undertakes a secret assignment; and Quinn has a decision to make that may prove to be a game-changer.

Not even at the halfway point of this hellacious day, two planes have collided outside of D.C., there has been an attempt on a chemical plant in Ohio, the President’s husband’s life has been threatened and the nation remains at risk. When Dubaku’s evil plan escalates to his boss, General Juma (guest star Tony Todd), the stakes are raised and steadfast President Taylor faces a deepening foreign policy dilemma.

Carrie and Yevgeny visit a bazaar, where they get a lead on the flight recorder. Tasneem meets with Jalal to stop him from provoking a war with the U.S.

Olivia Taylor, the President’s daughter, becomes increasingly involved in the day’s events, and the administration reels when a high-ranking official delivers devastating news.

Jack Bauer is forced to help Tony escape from custody, only to find Tony plans to use Jack to reconstitute the pathogen. Aaron Pierce and Ethan Kanin work together and discover Olivia's role in Hodges' murder. Kim Bauer takes down her captors, and works with Renee Walker to find her father.

Quinn learns the assassin he's tracking is linked to a place from his past. Max spots a familiar face at his new job and takes a risk to get evidence.

Dar uses strong-arm tactics to find out who's behind the Toxic Soldier blog. A phone tip sends Carrie and Quinn scrambling to save Keane's life.

The nation remains vulnerable as Starkwood mastermind Jonas Hodges (guest star Jon Voight) remains at the epicenter of the mounting terrorist threat. Meanwhile, the FBI and the administration scramble to provide security and justice, and Jack Bauer questions a key suspect

After new information comes to light, Carrie and Quinn pursue a key suspect in the Langley bombing. Saul deals with political backlash while Fara discovers the toll an intelligence job can take. Meanwhile, the Brody family gets startling news.

After Saul warns Haqqani that there's a mole in his camp, the Taliban leader summons his son. Carrie receives a mysterious invitation from Yevgeny.