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Alias Season 4

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Here's where to watch every episode of Alias season 4. Mouseover or tap an episode to see where to stream it. Click or tap the play icon to stream it on the best available service.
Season 04, Episode 01 Authorized Personnel Only (Part 1)

S04 E01

Jan 6, 2005
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Authorized Personnel Only (Part 1) Jan 6, 2005 Sydney quits the CIA and joins a Black Ops unit called "Authorized Personnel Only" alongside Dixon, Jack, Vaughn and... Sloane. Meanwhile, the truth Sydney found out in Wittenberg endangers her relationship with Jack, and eventually she reveals the awful truth to Vaughn.

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Season 04, Episode 02 Authorized Personnel Only (Part 2)

S04 E02

Jan 6, 2005
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Authorized Personnel Only (Part 2) Jan 6, 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. Sydney finds out the reason behind Jack's misdeed and Nadia makes an unsettling promise.

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Season 04, Episode 03 The Awful Truth

S04 E03

Jan 13, 2005
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The Awful Truth Jan 13, 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.

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Season 04, Episode 04 Ice

S04 E04

Jan 20, 2005
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Ice Jan 20, 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.

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Season 04, Episode 05 Welcome To Liberty Village

S04 E05

Jan 27, 2005
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Welcome To Liberty Village Jan 27, 2005 Sydney and Vaughn go undercover as a married couple so as to find a weapon that could bring back the Dark Ages. However, the neighborhood they've infiltrated is not as charming as it seems.

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Season 04, Episode 06 Nocturne

S04 E06

Feb 10, 2005
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Nocturne Feb 10, 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.

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Season 04, Episode 07 Détente

S04 E07

Feb 17, 2005
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Détente Feb 17, 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.

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Season 04, Episode 08 Echoes

S04 E08

Feb 24, 2005
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Echoes Feb 24, 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. However, Anna turns the tables on APO when she captures Nadia and forces Sydney to do her biddings. Sydney tells Nadia about the Rambaldi's prophecy which dictates that two sisters will fight and only one will survive. Meanwhile, Vaughn visits Sark and tries to trick him into helping them to catch Anna. In the end, one of the sisters is mortally wounded by Anna.

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Season 04, Episode 09 A Man of His Word

S04 E09

Mar 3, 2005
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A Man of His Word Mar 3, 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. Nadia may be the only person with the intel they need to intercept the bomb, so Jack is forced to prematurely wake Nadia from her coma, endangering her life, which doesn't please Sloane when he finds out.

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Season 04, Episode 10 The Index

S04 E10

Mar 10, 2005
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The Index Mar 10, 2005 Dixon enlists Sydney to help him prove that Sloane is double-crossing the CIA and using APO to steal the Blackwell Index, a master blackmail list, and to reconstruct the Alliance. Sydney makes her way into Sloane's house so as to copy the encryption key from his secure phone and crack his calls. When Nadia finds her, she becomes disappointed in her sister. Meanwhile, Vaughn discovers something disturbing about his father when he visits his comatose uncle.

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Season 04, Episode 11 The Road Home

S04 E11

Mar 17, 2005
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The Road Home Mar 17, 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.

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Season 04, Episode 12 The Orphan

S04 E12

Mar 24, 2005
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The Orphan Mar 24, 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. Meanwhile, Vaughn finds a person who is somehow connected to his father and Nadia as well.

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Season 04, Episode 13 Tuesday

S04 E13

Mar 31, 2005
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Tuesday Mar 31, 2005 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 to a deadly pathogen released inside APO.

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Season 04, Episode 14 Nightingale

S04 E14

Apr 7, 2005
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Nightingale Apr 7, 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.

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Season 04, Episode 15 Pandora

S04 E15

Apr 14, 2005
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Pandora Apr 14, 2005 In an attempt to talk to Sydney, Katya Derevko deliberately poisons herself and is temporally taken out from her cell. Once Nadia tells her sister about this, Sydney visits her aunt to tell her to stay away from Nadia. However, Katya unsettles Sydney by telling her that someone framed her mother as a means of getting her killed. Sydney sets off in search of the truth behind this story. Meanwhile, Vaughn becomes a rogue agent by getting involved with the people who might know his father's whereabouts. In the end, he and Sydney find out that the man behind these two plots is no other than A. Sloane. However, things are not exactly as they seem to be.

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Season 04, Episode 16 Another Mister Sloane

S04 E16

Apr 21, 2005
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Another Mister Sloane Apr 21, 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. After cornering Sloane, they both conclude that someone is framing him. The APO team set a trap to catch the fake A. Sloane, but they fail. Once they realize what "Arvin Clone" is after, Sloane suggests he should step down temporarily. However, Sydney reluctantly convinces him to stay on the case, since he may the only person able to anticipate "Arvin Clone's" next move. But Nadia fears that this pursuit may revive her father's past obsession – Rambaldi.

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Season 04, Episode 17 A Clean Conscience

S04 E17

Apr 28, 2005
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A Clean Conscience Apr 28, 2005 Nadia's former caretaker, Sophia, has been severely beaten. She contacts Nadia and asks to meet her. Sloane is told by Sophia that she was beaten up, because someone is trying to track Nadia down, so he and Jack decide to tell their daughters the truth – Elena Derevko, the third and the most cruelest of the Derevko sisters, has been surveilling both Sydney and Nadia for a decade. Meanwhile, Jack's doctor advises him to tell Sydney about his illness.

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Season 04, Episode 18 Mirage

S04 E18

May 5, 2005
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Mirage May 5, 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. For this, Sydney must play her own mother. Meanwhile, Sophia moves in with Sydney and Nadia.

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Season 04, Episode 19 In Dreams...

S04 E19

May 12, 2005
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In Dreams... May 12, 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.

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Season 04, Episode 20 The Descent

S04 E20

May 19, 2005
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The Descent May 19, 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. Soon Sloane and Jack arrive and suspect that Sophia, who had access to the computer while she was living with Syd and Nadia, is Elena Derevko. They follow her trail to a dead Rambaldi follower, a stunning betrayal, and a presumed dead family member...

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Season 04, Episode 21 Search and Rescue

S04 E21

May 19, 2005
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Search and Rescue May 19, 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. After a wounded Dixon reveals that Irina is alive, Sydney, Nadia, and Jack set off to find her. Irina had been captured, and then duplicated using Project Helix, in order to give the impression that she was dead. Sydney and Nadia discover Irina is being held inside a camp in Tikal, safely in the clutches of Elena's army. Irina had apparently been working to counter Elena's organization, the Covenant, and actually PREVENT the Rambaldi endgame. Irina tells of a page she destroyed, a page that was key to Rambaldi's endgame. Under torture, she finally broke and recreated it for Elena. After a short respite, the transport turns towards Russia, and Sydney, Vaughn, Jack, Nadia, and Irina parachute down, towards Elena, Sloane, the Circumference....and destiny.

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Season 04, Episode 22 Before the Flood

S04 E22

May 26, 2005
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Before the Flood May 26, 2005 Jack, Sydney, Irina, Vaughn and Nadia parachute into Sovogda. They're supposed to dismantle a giant red ball turning people into zombies. At APO, Marshall and Weiss use the Blackwell Index to blackmail the Russian minister into giving them the access codes to a Russian satellite, they discover that Elena is uplinking the satellite. A CIA agent, Brodien reminds them that the Rambaldi device is broadcasting a subaudible frequency that physiologically alters people who drink it and it is irreversible. Elena learns of the APO team's arrival.

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