Sydney Bristow, an agent who has been tricked to believe she is working for the U.S. government, is actually working for a criminal organization named the Alliance of Twelve. Upon learning this, Sydney becomes a double agent for the real CIA.
 | Season 1 Episode 1Truth Be Told First Air Date: 2001-09-30 | Duration: 60 min |
 | Season 1 Episode 2So It Begins First Air Date: 2001-10-07 | Duration: 60 min |
 | Season 1 Episode 3Parity First Air Date: 2001-10-14 | Duration: 60 min |
 | Season 1 Episode 4A Broken Heart First Air Date: 2001-10-21 | Duration: 60 min |
 | Season 1 Episode 5Doppelgänger First Air Date: 2001-10-28 | Duration: 60 min |
 | Season 1 Episode 6Reckoning First Air Date: 2001-11-18 | Duration: 60 min |
 | Season 1 Episode 7Color-Blind First Air Date: 2001-11-25 | Duration: 60 min |
 | Season 1 Episode 8Time Will Tell First Air Date: 2001-12-02 | Duration: 60 min |
 | Season 1 Episode 9Mea Culpa First Air Date: 2001-12-09 | Duration: 60 min |
 | Season 1 Episode 10Spirit First Air Date: 2001-12-16 | Duration: 60 min |
 | Season 1 Episode 11The Confession First Air Date: 2002-01-06 | Duration: 60 min |
 | Season 1 Episode 12The Box (Part 1) First Air Date: 2002-01-20 | Duration: 60 min |
 | Season 1 Episode 13The Box (Part 2) First Air Date: 2002-02-10 | Duration: 60 min |
 | Season 1 Episode 14The Coup First Air Date: 2002-02-24 | Duration: 60 min |
 | Season 1 Episode 15Page 47 First Air Date: 2002-03-03 | Duration: 60 min |
 | Season 1 Episode 16The Prophecy First Air Date: 2002-03-10 | Duration: 60 min |
 | Season 1 Episode 17Q&A First Air Date: 2002-03-17 | Duration: 60 min |
 | Season 1 Episode 18Masquerade First Air Date: 2002-04-07 | Duration: 60 min |
 | Season 1 Episode 19Snowman First Air Date: 2002-04-14 | Duration: 60 min |
 | Season 1 Episode 20The Solution First Air Date: 2002-04-21 | Duration: 60 min |
 | Season 1 Episode 21Rendezvous First Air Date: 2002-05-05 | Duration: 60 min |
 | Season 1 Episode 22Almost Thirty Years First Air Date: 2002-05-12 | Duration: 60 min |
 | Season 2 Episode 1The Enemy Walks In First Air Date: 2002-09-29 | Duration: 60 min |
 | Season 2 Episode 2Trust Me First Air Date: 2002-10-06 | Duration: 60 min |
 | Season 2 Episode 3Cipher First Air Date: 2002-10-13 | Duration: 60 min |
 | Season 2 Episode 4Dead Drop First Air Date: 2002-10-20 | Duration: 60 min |
 | Season 2 Episode 5The Indicator First Air Date: 2002-11-03 | Duration: 60 min |
 | Season 2 Episode 6Salvation First Air Date: 2002-11-10 | Duration: 60 min |
 | Season 2 Episode 7The Counteragent First Air Date: 2002-11-17 | Duration: 60 min |
 | Season 2 Episode 8Passage (Part 1) First Air Date: 2002-12-01 | Duration: 60 min |
 | Season 2 Episode 9Passage (Part 2) First Air Date: 2002-12-08 | Duration: 60 min |
 | Season 2 Episode 10The Abduction First Air Date: 2002-12-15 | Duration: 60 min |
 | Season 2 Episode 11A Higher Echelon First Air Date: 2003-01-05 | Duration: 60 min |
 | Season 2 Episode 12The Getaway First Air Date: 2003-01-12 | Duration: 60 min |
 | Season 2 Episode 13Phase One First Air Date: 2003-01-26 | Duration: 60 min |
 | Season 2 Episode 14Double Agent First Air Date: 2003-02-02 | Duration: 60 min |
 | Season 2 Episode 15A Free Agent First Air Date: 2003-02-09 | Duration: 60 min |
 | Season 2 Episode 16Firebomb First Air Date: 2003-02-23 | Duration: 60 min |
 | Season 2 Episode 17A Dark Turn First Air Date: 2003-03-02 | Duration: 60 min |
 | Season 2 Episode 18Truth Takes Time First Air Date: 2003-03-16 | Duration: 60 min |
 | Season 2 Episode 19Endgame First Air Date: 2003-03-30 | Duration: 60 min |
 | Season 2 Episode 20Countdown First Air Date: 2003-04-27 | Duration: 60 min |
 | Season 2 Episode 21Second Double First Air Date: 2003-05-04 | Duration: 60 min |
 | Season 2 Episode 22The Telling First Air Date: 2003-05-04 | Duration: 60 min |
 | Season 3 Episode 1The Two First Air Date: 2003-09-28 | Duration: 60 min |
 | Season 3 Episode 2Succession First Air Date: 2003-10-05 | Duration: 60 min |
 | Season 3 Episode 3Reunion First Air Date: 2003-10-12 | Duration: 60 min |
 | Season 3 Episode 4A Missing Link First Air Date: 2003-10-19 | Duration: 60 min |
 | Season 3 Episode 5Repercussions First Air Date: 2003-10-26 | Duration: 60 min |
 | Season 3 Episode 6The Nemesis First Air Date: 2003-11-02 | Duration: 60 min |
 | Season 3 Episode 7Prelude First Air Date: 2003-11-09 | Duration: 60 min |
 | Season 3 Episode 8Breaking Point First Air Date: 2003-11-23 | Duration: 60 min |
 | Season 3 Episode 9Conscious First Air Date: 2003-11-30 | Duration: 60 min |
 | Season 3 Episode 10Remnants First Air Date: 2003-12-07 | Duration: 60 min |
 | Season 3 Episode 11Full Disclosure First Air Date: 2004-01-11 | Duration: 60 min |
 | Season 3 Episode 12Crossings First Air Date: 2004-01-18 | Duration: 60 min |
 | Season 3 Episode 13After Six First Air Date: 2004-02-15 | Duration: 60 min |
 | Season 3 Episode 14Blowback First Air Date: 2004-03-07 | Duration: 60 min |
 | Season 3 Episode 15Facade First Air Date: 2004-03-14 | Duration: 60 min |
 | Season 3 Episode 16Taken First Air Date: 2004-03-21 | Duration: 60 min |
 | Season 3 Episode 17The Frame First Air Date: 2004-03-28 | Duration: 60 min |
 | Season 3 Episode 18Unveiled First Air Date: 2004-04-11 | Duration: 60 min |
 | Season 3 Episode 19Hourglass First Air Date: 2004-04-18 | Duration: 60 min |
 | Season 3 Episode 20Blood Ties First Air Date: 2004-04-25 | Duration: 60 min |
 | Season 3 Episode 21Legacy First Air Date: 2004-05-02 | Duration: 60 min |
 | Season 3 Episode 22Resurrection First Air Date: 2004-05-23 | Duration: 60 min |
 | Season 4 Episode 1Authorized Personnel Only (Part 1) First Air Date: 2005-01-05 | Duration: 60 min |
 | Season 4 Episode 2Authorized Personnel Only (Part 2) First Air Date: 2005-01-05 | Duration: 60 min |
 | Season 4 Episode 3The Awful Truth First Air Date: 2005-01-12 | Duration: 60 min |
 | Season 4 Episode 4Ice First Air Date: 2005-01-19 | Duration: 60 min |
 | Season 4 Episode 5Welcome to Liberty Village First Air Date: 2005-01-26 | Duration: 60 min |
 | Season 4 Episode 6Nocturne First Air Date: 2005-02-09 | Duration: 60 min |
 | Season 4 Episode 7Détente First Air Date: 2005-02-16 | Duration: 60 min |
 | Season 4 Episode 8Echoes First Air Date: 2005-02-23 | Duration: 60 min |
 | Season 4 Episode 9A Man of His Word First Air Date: 2005-03-02 | Duration: 60 min |
 | Season 4 Episode 10The Index First Air Date: 2005-03-09 | Duration: 60 min |
 | Season 4 Episode 11The Road Home First Air Date: 2005-03-16 | Duration: 60 min |
 | Season 4 Episode 12The Orphan First Air Date: 2005-03-23 | Duration: 60 min |
 | Season 4 Episode 13Tuesday First Air Date: 2005-03-30 | Duration: 60 min |
 | Season 4 Episode 14Nightingale First Air Date: 2005-04-06 | Duration: 60 min |
 | Season 4 Episode 15Pandora First Air Date: 2005-04-13 | Duration: 60 min |
 | Season 4 Episode 16Another Mister Sloane First Air Date: 2005-04-20 | Duration: 60 min |
 | Season 4 Episode 17A Clean Conscience First Air Date: 2005-04-27 | Duration: 60 min |
 | Season 4 Episode 18Mirage First Air Date: 2005-05-04 | Duration: 60 min |
 | Season 4 Episode 19In Dreams... First Air Date: 2005-05-11 | Duration: 60 min |
 | Season 4 Episode 20The Descent First Air Date: 2005-05-18 | Duration: 60 min |
 | Season 4 Episode 21Search and Rescue First Air Date: 2005-05-18 | Duration: 60 min |
 | Season 4 Episode 22Before the Flood First Air Date: 2005-05-25 | Duration: 60 min |
 | Season 5 Episode 1Prophet Five First Air Date: 2005-09-29 | Duration: 60 min |
 | Season 5 Episode 2...1... First Air Date: 2005-10-06 | Duration: 60 min |
 | Season 5 Episode 3The Shed First Air Date: 2005-10-13 | Duration: 60 min |
 | Season 5 Episode 4Mockingbird First Air Date: 2005-10-20 | Duration: 60 min |
 | Season 5 Episode 5Out of the Box First Air Date: 2005-10-27 | Duration: 60 min |
 | Season 5 Episode 6Solo First Air Date: 2005-11-10 | Duration: 60 min |
 | Season 5 Episode 7Fait Accompli First Air Date: 2005-11-17 | Duration: 60 min |
 | Season 5 Episode 8Bob First Air Date: 2005-12-07 | Duration: 60 min |
 | Season 5 Episode 9The Horizon First Air Date: 2005-12-14 | Duration: 60 min |
 | Season 5 Episode 10S.O.S. First Air Date: 2006-04-19 | Duration: 60 min |
 | Season 5 Episode 11Maternal Instinct First Air Date: 2006-04-19 | Duration: 60 min |
 | Season 5 Episode 12There's Only One Sydney Bristow First Air Date: 2006-04-26 | Duration: 60 min |
 | Season 5 Episode 1330 Seconds First Air Date: 2006-05-03 | Duration: 60 min |
 | Season 5 Episode 14I See Dead People First Air Date: 2006-05-10 | Duration: 60 min |
 | Season 5 Episode 15No Hard Feelings First Air Date: 2006-05-17 | Duration: 60 min |
 | Season 5 Episode 16Reprisal First Air Date: 2006-05-22 | Duration: 60 min |
 | Season 5 Episode 17All the Time in the World First Air Date: 2006-05-22 | Duration: 60 min |
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Season 0 First Air Date: |
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Season 1 First Air Date: 2001-09-30 |
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Season 2 First Air Date: 2002-09-29 |
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Season 3 First Air Date: 2003-09-28 |
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Season 4 First Air Date: 2005-01-05 |
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Season 5 First Air Date: 2005-09-29 |
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Jennifer Garner as Sydney Bristow |
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Michael Vartan as Michael Vaughn |
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Ron Rifkin as Arvin Sloane |
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Carl Lumbly as Marcus Dixon |
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Victor Garber as Jack Bristow |
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Lena Olin as Irina Derevko |
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Kevin Weisman as Marshall Flinkman |
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David Anders as Julian Sark |
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Greg Grunberg as Eric Weiss |
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Merrin Dungey as Francie Calfo |
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Bradley Cooper as Will Tippin |
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Rachel Nichols as Rachel Gibson |
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Melissa George as Lauren Reed |
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Johnny Trí Nguyễn as Chinese Guard |
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Amy Acker as Kelly Peyton |
| Production | J.J. Abrams | Executive Producer |
| Production | Roberto Orci | Producer |
| Production | Ken Olin | Producer |
| Production | Bryan Burk | Producer |
| Production | Alex Kurtzman | Producer |