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Alias (2001 – 2006)

2001 • 5 seasons • Drama, Action & Adventure • TV-14
On September 19, 2026
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All seasons

AliasSeason 4

22 episodes · Jan 5, 2005

Get ready for a pulse-pounding fourth season! Fresh off leaving the familiar world of the CIA, Sydney dives headfirst into a shadowy new Black Ops team – unaware that a surprising and significant figure from her past is waiting just around the corner. The stakes are higher than ever as she navigates this dangerous new landscape.

1. Authorized Personnel Only (1)
Jan 5, 2005 · 44m · 7.9

Leaving the Central Intelligence Agency, Sydney joined a clandestine black operations team known simply as “Authorized Personnel Only,” finding herself among Dixon, Jack, Vaughn, and—unexpectedly—Sloane. The unsettling discovery she’d made

2. Authorized Personnel Only (2)
Jan 5, 2005 · 44m · 7.8

Sydney found herself reluctantly partnering with her father in pursuit of a contemporary samurai. Simultaneously, Nadia resisted returning to the world of espionage, yet duty compelled her when Sydney’s safety was threatened. A revelation c

3. The Awful Truth
Jan 12, 2005 · 42m · 8.0

To recover a purloined National Security Agency code-breaking program, Sydney is tasked with gaining the confidence of a ruthless arms dealer. Simultaneously, Vaughn harbors grave concerns for Weiss’s safety, while Sydney and Jack debate wh

4. Ice
Jan 19, 2005 · 41m · 7.9

Sydney and Vaughn assume false identities in pursuit of a dangerous, newly developed bioweapon. Simultaneously, Sydney worries that Vaughn has not fully moved on from his past relationship with Lauren, while Nadia seeks guidance from a trus

5. Welcome to Liberty Village
Jan 26, 2005 · 42m · 8.4

To locate an artifact capable of plunging the world into darkness, Sydney and Vaughn assumed the guise of a devoted couple. Yet, the seemingly idyllic community they’d entered concealed a disquieting undercurrent, hinting at something far m

6. Nocturne
Feb 9, 2005 · 43m · 7.7

Under the influence of a potent hallucinogen, Sydney began to drift from reality. Vaughn and Jack raced against time to locate an antidote, knowing that if they failed, Sydney’s life—and the safety of those around her—would be gravely threa

7. Détente
Feb 16, 2005 · 41m · 7.5

As Sydney and Nadia clashed over Nadia’s willingness to accept Sloane's protective instincts, Sloane found herself increasingly concerned for Nadia’s safety; the two women were about to venture deep undercover, posing as frivolous, privileg

8. Echoes
Feb 23, 2005 · 43m · 7.9

Sloane has temporarily relinquished his position as Director of the Task Force, granting Jack complete authority over their next operation—one centered around Anna Espinosa, a familiar adversary of Sydney’s. But Anna swiftly reverses the si

9. A Man of His Word
Mar 2, 2005 · 41m · 7.6

With Nadia unconscious, Sark was brought into APO and tasked with infiltrating the Cadmus Revolutionary Front to recover the bomb. His price for cooperation: a viewing of Lauren’s remains, and Vaughn’s willingness to open her coffin so he c

10. The Index
Mar 9, 2005 · 43m · 8.1

Dixon brought Sydney on board to help him demonstrate that Sloane was betraying the CIA, exploiting APO to pilfer the Blackwell Index—a comprehensive ledger of blackmail material—and rebuild the Alliance. To gain access, Sydney infiltrated

11. The Road Home
Mar 16, 2005 · 42m · 7.5

Sydney finds herself compelled to safeguard a civilian whose safety she inadvertently jeopardized. Elsewhere, Jack arranges a meeting with a longtime acquaintance, while Vaughn continues to piece together unsettling truths concerning his fa

12. The Orphan
Mar 23, 2005 · 44m · 7.4

Driven by her inability to expose a perilous figure from her past, Nadia unwittingly jeopardizes not only her own life but also those of Sydney and Weiss. Simultaneously, Vaughn uncovers an individual with surprising ties to both his father

13. Tuesday
Mar 30, 2005 · 44m · 8.1

As a mission unravels, Sydney finds herself vulnerable, with Marshall uniquely positioned to protect her. Simultaneously, Dixon faces grave peril, encountering a lethal pathogen unleashed within the confines of APO.

14. Nightingale
Apr 6, 2005 · 43m · 7.9

Driven by a desperate need for answers, Sydney and Vaughn put themselves in grave danger as they investigate the secrets surrounding Vaughn’s father. Ultimately, the reasons behind Jack and Sloane’s unsettling alliance with each other – an

15. Pandora
Apr 13, 2005 · 44m · 7.8

Desperate to reach Sydney, Katya Derevko staged a self-inflicted poisoning, briefly removed from her confinement. Upon hearing of this act, Sydney went to visit her aunt, intending to warn her against contact with Nadia. But Katya disturbed

16. Another Mister Sloane
Apr 20, 2005 · 43m · 7.9

Sydney and Vaughn recounted to Jack Sloane’s suspected connection to Vaughn’s own search for his missing father, and Irina’s contract placed on Sydney’s life. Confronting Sloane directly, they both arrived at the conclusion that he was bein

17. A Clean Conscience
Apr 27, 2005 · 43m · 7.9

Sophia, Nadia’s former guardian, was brutally attacked and reached out to Nadia, requesting a meeting. Sophia revealed she had been assaulted because someone was attempting to locate Nadia, prompting Sloane and Jack to decide it was time th

18. Mirage
May 4, 2005 · 43m · 7.9

Jack’s sickness has brought on vivid delusions of a remedy. Now, Sydney is tasked with reconstructing a period from Jack's past – his time working for the CIA – when he concealed the identity of the only person who could possibly offer him

19. In Dreams...
May 11, 2005 · 44m · 7.6

The team apprehended the Sloane imposter and pressed him for information, hoping to learn the whereabouts of a rare Rambaldi orchid. To elicit the truth, the genuine Sloane was forced to confront a deeply distressing memory.

20. The Descent
May 18, 2005 · 44m · 7.8

When a covert team breached the DSR and absconded with Rambaldi artifacts, CIA Director Hayden Chase uncovered evidence that the facility’s alarms had been deactivated from Nadia's computer, facilitating the theft. He confronted her at her

21. Search and Rescue
May 18, 2005 · 44m · 7.9

The pieces of Rambaldi’s devastating final plan began to coalesce as an enormous version of the Circumference/Mueller device was discovered hovering above a Russian city, inciting widespread panic among its inhabitants. Following a painful

22. Before the Flood
May 25, 2005 · 44m · 7.3

Jack, Sydney, Irina, Vaughn, and Nadia descended into Sovogda by parachute. Their mission: to disable a colossal red sphere converting its inhabitants into mindless drones. Meanwhile, at APO, Marshall and Weiss leveraged the Blackwell Index

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