Alias
Season 4
22 episodes
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S04E01 Authorized Personnel Only (Part 1)
Sydney quits the CIA and joins a Black Ops unit, "Authorized Personnel Only," along with Jack, Vaughn, Dixon, Marshall, Nadia and Sloane.
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S04E02 Authorized Personnel Only (Part 2)
What Sydney found out in Wittenburg may endanger her relationship with Jack.
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S04E03 The Awful Truth
Sloane says Valta, a computer that will revolutionize info gathering, was stolen from the NSA headquarters by Martin Bishop, who will deliver it to a german terrorist group.
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S04E04 Ice
Sydney and Vaughn are sent on a mission by APO to obtain a sample of Ice 5, a weapon that can freeze a person to death.
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S04E05 Welcome to Liberty Village
Posing as a Chechen couple, Sydney and Vaughn infiltrate a training camp run by the October Contingent.
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S04E06 Nocturne
After being infected by a hallucinogen, Sydney starts to lose touch with reality.
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S04E07 Détente
Nadia and Sydney go undercover as wealthy, irresponsible young heiresses to uncover the whereabouts of a deadly chemical.
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S04E08 Echoes
Sloane 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.
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S04E09 A Man of His Word
While Nadia is in a coma, Sark is taken into APO to help them infiltrate Cadmus Revolutionary Front and retrieve the bomb.
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S04E10 The Index
Dixon enlists Sydney's to help him prove Sloane is double-crossing the CIA and using APO to steal the Blackwell Index, a master blackmail list.
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S04E11 The Road Home
Sydney must protect the life of a civilian she unintentionally put in danger.
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S04E12 The Orphan
Nadia puts the ones she loves in danger when she forgets to tell them about her criminal past.
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S04E13 Tuesday
When a mission does not go well, Sydney is attacked and her life is put in danger. The only one who can save Sydney is Marshall.
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S04E14 Nightingale
Jack agrees to Sydney's request for clearence on files relating to Vaughn's father.
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S04E15 Pandora
Dixon is shot by a masked gunman. The shooter approaches and takes off his mask, revealing Vaughn.
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S04E16 Another Mister Sloane
In Poland, men posing as airport guards abduct Professor Sinclair, a nuclear physicist. She wakes up bound in a dark room and is greeted by a man impersonating Arvin Sloane.
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S04E17 A Clean Conscience
The APO team watches footage of an explosion at an Indonesian embassy in Copenhagen that killed 15 people, the work of terrorists headed by Milos Kradic.
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S04E18 Mirage
Sydney tells Vaughn that she hasn't seen her father in two days. They go to his apartment and find a notebook with recent records of Jack's vitals.
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S04E19 In Dreams...
The Sloane imposter is questioned about the Rambaldi orchid, but first the real Sloane must remember a painful memory.
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S04E20 The Descent
A tactical group infiltrates the DSR and steals the Rambaldi artifacts. Sophia says goodbye to Nadia and Sydney, telling them that the Lisbon police confirmed that it is safe.
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S04E21 Search and Rescue
A giant version of the Circumference/Mueller device is found floating over a city in Russia, making the citizens insane. Sydney, Nadia and Jack search for Irina.
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S04E22 Before the Flood
Jack, Sydney, Vaughn and Irina parachute into Sovogda, trying to dismantle a giant red ball turning people into zombies.
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