Season 4 Episodes

Episode Guide

Before the Flood

Season 4, Episode 22 - Air Date: 5/25/2005
Jack, Sydney, Irina, Vaughn and Nadia parachute into Sovogda. They're supposed to dismantle a giant red ball turning people into zombies.
Episode Guide

Search and Rescue

Season 4, Episode 21 - Air Date: 5/18/2005
Rambaldi's catastrophic endgame begins to fall into place as a giant version of the Circumference/Mueller device is found floating over city in Russia, driving the citizens made.
Episode Guide

The Descent

Season 4, Episode 20 - Air Date: 5/18/2005
After a tactical group infiltrates the DSR and steals Rambaldi artifacts, CIA director Hayden Chase discovers that the alarms at the DSR were disabled from Nadia's computer, allowing the raid to happen, and shows up at the apartment to question her.
Episode Guide

In Dreams...

Season 4, Episode 19 - Air Date: 5/11/2005
The team captures the Sloane Imposter and questions him to find a rare Rambaldi orchid. The real Sloane must relive a painful memory in order to get the Imposter to reveal the orchid location.
Episode Guide


Season 4, Episode 18 - Air Date: 5/4/2005
Jack's illness has caused him to hallucinate about a cure. Sydney must recreate the time when Jack was working for the CIA and hid the only man who might be able to help him now.
Episode Guide

A Clean Conscience

Season 4, Episode 17 - Air Date: 4/27/2005
Nadia's former caretaker, Sophia, has been severely beaten. She contacts Nadia and asks to meet her.
Episode Guide

Another Mister Sloane

Season 4, Episode 16 - Air Date: 4/20/2005
Sydney and Vaughn tell Jack about Sloane's alleged involvement in Vaughn's search for his father and Irina's contract on Sydney's life.
Episode Guide


Season 4, Episode 15 - Air Date: 4/13/2005
In an attempt to talk to Sydney, Katya Derevko deliberately poisons herself and is temporally taken out from her cell.
Episode Guide


Season 4, Episode 14 - Air Date: 4/6/2005
Sydney and Vaughn risk their lives trying to find out the truth about Vaughn's father. Finally, we find out why Jack and Sloane seem to be conspiring together against Sydney and Vaughn.
Episode Guide


Season 4, Episode 13 - Air Date: 3/30/2005
When a mission goes wrong, Sydney's is placed in danger and Marshall is the only one who can save her.
Episode Guide

The Orphan

Season 4, Episode 12 - Air Date: 3/23/2005
Nadia puts her own life - as well Sydney's and Weiss's - in danger after failing to unveil her past through a dangerous criminal.
Episode Guide

The Road Home

Season 4, Episode 11 - Air Date: 3/16/2005
Sydney must protect the life of a civilian, whom she unintentionally put in danger. Meanwhile, Jack plans a visit with an old friend, and Vaughn uncovers more disturbing secrets about his father.
Episode Guide

The Index

Season 4, Episode 10 - Air Date: 3/9/2005
Dixon enlists Sydney to help him prove that Sloane is double-crossing the CIA and using APO to steel the Blackwell Index, a master blackmail list, and to reconstruct the Alliance.
Episode Guide

A Man of His Word

Season 4, Episode 9 - Air Date: 3/2/2005
While Nadia is in a coma, Sark is taken into APO and to help them infiltrate Cadmus Revolutionary Front and retrieve the bomb, but in return he demands to see Lauren's corpse and that Vaughn opens her coffin the for him.
Episode Guide


Season 4, Episode 8 - Air Date: 2/23/2005
Sloane temporarily steps down as Director of his Task Force and gives Jack full authority over the next assignment, which involves Anna Espinosa, Sydney's old foe.
Episode Guide


Season 4, Episode 7 - Air Date: 2/16/2005
While Sydney and Nadia argue about Nadia's acceptance of Sloane's fatherly concerns, Sloane worries about Nadia's well-being when she and Sydney go undercover as wealthy, irresponsible young heiresses to uncover the whereabouts of a deadly chemical.
Episode Guide


Season 4, Episode 6 - Air Date: 2/9/2005
After being infected with a hallucinogen, Sydney starts to lose touch with reality. Vaughn and Jack must rush to find an antidote before Sydney puts her life - and others next to her - into danger.
Episode Guide

Welcome To Liberty Village

Season 4, Episode 5 - Air Date: 1/26/2005
Sydney and Vaughn go undercover as a married couple so as to find a weapon that could bring back the Dark Ages.
Episode Guide


Season 4, Episode 4 - Air Date: 1/19/2005
Sydney and Vaughn go undercover to track down a deadly new bio-weapon. Meanwhile, Sydney is concerned about Vaughn not having yet put Lauren behind, and Nadia turns to a Jack to find out the truth about her mother.
Episode Guide

The Awful Truth

Season 4, Episode 3 - Air Date: 1/12/2005
Sydney must seduce a murderous arms dealer in order to track down a stolen NSA code-breaker. Meanwhile, Vaughn fears for Weiss's life, and Sydney and Jack argue about telling Nadia the truth about her mother.
Episode Guide

Authorized Personnel Only (2)

Season 4, Episode 2 - Air Date: 1/5/2005
Sydney unwillingly teams up with her father to hunt down a modern-day samurai. Meanwhile, Nadia doesn't want to go back to the spy business, but is forced to when Sydney's life is jeopardized.
Episode Guide

Authorized Personnel Only (1)

Season 4, Episode 1 - Air Date: 1/5/2005
Sydney quits the CIA and joins a Black Ops unit called "Authorized Personnel Only" alongside Dixon, Jack, Vaughn and.