Season 4 (2005)

Authorized Personnel Only (1)
7.6

January 5, 2005 • 44m

Sydney quits the CIA and joins a Black Ops unit called "Authorized Personnel Only" alongside Dixon, Jack, Vaughn and... Sloane. Me...Read more

Authorized Personnel Only (2)
7.9

January 5, 2005 • 44m

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...Read more

The Awful Truth
7.9

January 12, 2005 • 42m

Sydney must seduce a murderous arms dealer in order to track down a stolen NSA code-breaker. Meanwhile, Vaughn fears for Weiss's l...Read more

Ice
7.7

January 19, 2005 • 41m

Sydney and Vaughn go undercover to track down a deadly new bio-weapon. Meanwhile, Sydney is concerned about Vaughn not having yet ...Read more

Welcome To Liberty Village
8.3

January 26, 2005 • 42m

Sydney and Vaughn go undercover as a married couple so as to find a weapon that could bring back the Dark Ages. However, the neigh...Read more

Nocturne
7.7

February 9, 2005 • 43m

After being infected with a hallucinogen, Sydney starts to lose touch with reality. Vaughn and Jack must rush to find an antidote ...Read more

Détente
7.6

February 16, 2005 • 41m

While Sydney and Nadia argue about Nadia's acceptance of Sloane's fatherly concerns, Sloane worries about Nadia's well-being when ...Read more

Echoes
7.5

February 23, 2005 • 43m

Sloane temporarily steps down as Director of his Task Force and gives Jack full authority over the next assignment, which involves...Read more

A Man of His Word
7.6

March 2, 2005 • 41m

While Nadia is in a coma, Sark is taken into APO to help them infiltrate Cadmus Revolutionary Front and retrieve the bomb, but in ...Read more

The Index
7.9

March 9, 2005 • 43m

Dixon enlists Sydney to help him prove that Sloane is double-crossing the CIA and using APO to steal the Blackwell Index, a master...Read more

The Road Home
7.6

March 16, 2005 • 42m

Sydney must protect the life of a civilian, whom she unintentionally put in danger. Meanwhile, Jack plans a visit with an old frie...Read more

The Orphan
7.4

March 23, 2005 • 44m

Nadia puts her own life - as well Sydney's and Weiss's - in danger after failing to unveil her past through a dangerous criminal. ...Read more

Tuesday
8.1

March 30, 2005 • 44m

When a mission goes wrong, Sydney's is placed in danger and Marshall is the only one who can save her. Meanwhile, Dixon is exposed...Read more

Nightingale
7.9

April 6, 2005 • 43m

Sydney and Vaughn risk their lives trying to find out the truth about Vaughn's father. Finally, we find out why Jack and Sloane se...Read more

Pandora
7.7

April 13, 2005 • 44m

In an attempt to talk to Sydney, Katya Derevko deliberately poisons herself and is temporally taken out from her cell. Once Nadia ...Read more

Another Mister Sloane
7.7

April 20, 2005 • 43m

Sydney and Vaughn tell Jack about Sloane's alleged involvement in Vaughn's search for his father and Irina's contract on Sydney's ...Read more

A Clean Conscience
7.7

April 27, 2005 • 43m

Nadia's former caretaker, Sophia, has been severely beaten. She contacts Nadia and asks to meet her. Sloane is told by Sophia that...Read more

Mirage
7.7

May 4, 2005 • 43m

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...Read more

In Dreams...
7.6

May 11, 2005 • 44m

The team captures the Sloane Imposter and questions him to find a rare Rambaldi orchid. The real Sloane must relive a painful memo...Read more

The Descent
7.9

May 18, 2005 • 44m

After a tactical group infiltrates the DSR and steals Rambaldi artifacts, CIA director Hayden Chase discovers that the alarms at t...Read more

Search and Rescue
8.0

May 18, 2005 • 44m

Rambaldi's catastrophic endgame begins to fall into place as a giant version of the Circumference/Mueller device is found floating...Read more

Before the Flood
8.3

May 25, 2005 • 44m

Jack, Sydney, Irina, Vaughn and Nadia parachute into Sovogda. They're supposed to dismantle a giant red ball turning people into z...Read more