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Season 4

Sydney rejoins APO, a black-ops unit under CIA control led by her father Jack and former enemy Arvin Sloane. Working alongside familiar faces, she struggles with loyalty, trust, and shifting alliances as Rambaldi’s endgame looms. Personal ties are tested as family, love, and betrayal collide under the weight of prophecy.

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  • TheTVDB.com Season ID 9469
  • Created February 4, 2008
  • Modified July 3, 2025
When available, episode names will be translated into your preferred language. Otherwise they will be shown using the series' origin language.
Name First Aired Runtime Image
S04E01 Authorized Personnel Only (1)
January 5, 2005
ABC (US)
 42
S04E02 Authorized Personnel Only (2)
January 5, 2005
ABC (US)
 42
S04E03 The Awful Truth
January 12, 2005
ABC (US)
 40
S04E04 Ice
January 19, 2005
ABC (US)
 39
S04E05 Welcome to Liberty Village
January 26, 2005
ABC (US)
 41
S04E06 Nocturne
February 9, 2005
ABC (US)
 40
S04E07 Détente
February 16, 2005
ABC (US)
 39
S04E08 Echoes
February 23, 2005
ABC (US)
 41
S04E09 A Man of His Word
March 2, 2005
ABC (US)
 39
S04E10 The Index
March 9, 2005
ABC (US)
 41
S04E11 The Road Home
March 16, 2005
ABC (US)
 40
S04E12 The Orphan
March 23, 2005
ABC (US)
 42
S04E13 Tuesday
March 30, 2005
ABC (US)
 42
S04E14 Nightingale
April 6, 2005
ABC (US)
 41
S04E15 Pandora
April 13, 2005
ABC (US)
 42
S04E16 Another Mister Sloane
April 20, 2005
ABC (US)
 41
S04E17 A Clean Conscience
April 27, 2005
ABC (US)
 41
S04E18 Mirage
May 4, 2005
ABC (US)
 41
S04E19 In Dreams...
May 11, 2005
ABC (US)
 42
S04E20 The Descent
May 18, 2005
ABC (US)
 42
S04E21 Search and Rescue
May 18, 2005
ABC (US)
 42
S04E22 Before the Flood
season finale
May 25, 2005
ABC (US)
 42