My name is Sydney Bristow. Seven years ago I was recruited by a secret branch of the CIA called SD-6. I was sworn to secrecy, but I couldn't keep it from my fiancé. And when the head of SD-6 found out... he had him killed. That's when I learned the truth, SD-6 is not part of the CIA. I'd been working for the very people I thought I was fighting against. So I went to the only place that could help me take them down. Now, I'm a double agent for the CIA, where my handler is a man named Michael Vaughn. Only one other person knows the truth about what I do, another double agent inside SD-6, someone I hardly know... my father.
| Season One | 22 color episodes in one hour format | |||
|---|---|---|---|---|
| Ep | PN | Airdate | Title | |
| 1 | E535J | Sep 30/01 | Truth Be Told (90 mins) | |
| 2 | E631 | Oct 07/01 | So it Begins | |
| 3 | E632 | Oct 14/01 | Parity | |
| 4 | E633 | Oct 21/01 | A Broken Heart | |
| 5 | E634 | Oct 28/01 | Doppelganger | |
| 6 | E635 | Nov 18/01 | Reckoning | |
| 7 | E636 | Nov 25/01 | Color Blind | |
| 8 | E637 | Dec 02/01 | Time Will Tell | |
| 9 | E638 | Dec 09/01 | Mea Culpa | |
| 10 | E639 | Dec 16/01 | Spirit | |
| 11 | E640 | Jan 06/02 | The Confession | |
| 12 | E641 | Jan 20/02 | The Box | |
| 13 | E642 | Feb 10/02 | The Box, Part 2 | |
| 14 | E643 | Feb 24/02 | The Coup | |
| 15 | E644 | Mar 03/02 | Page 47 | |
| 16 | E645 | Mar 10/02 | The Prophecy | |
| 17 | E646 | Mar 17/02 | Q & A | |
| 18 | E647 | Apr 07/02 | Masquerade | |
| 19 | E648 | Apr 14/02 | Snowman | |
| 20 | E649 | Apr 21/02 | The Solution | |
| 21 | E650 | May 05/02 | Rendezvous | |
| 22 | E651 | May 12/02 | Almost Thirty Years | |
| Season Two | 22 color episodes in one hour format | |||
|---|---|---|---|---|
| Ep | PN | Airdate | Title | |
| 23 | E652 | Sep 29/02 | The Enemy Walks In | |
| 24 | E653 | Oct 06/02 | Trust Me | |
| 25 | E654 | Oct 13/02 | Cipher | |
| 26 | E655 | Oct 20/02 | Dead Drop | |
| 27 | E656 | Nov 03/02 | The Indicator | |
| 28 | E657 | Nov 10/02 | Salvation | |
| 29 | E658 | Nov 17/02 | The Counteragent | |
| 30 | E659 | Dec 01/02 | Passage | |
| 31 | E660 | Dec 08/02 | Passage, Part 2 | |
| 32 | E661 | Dec 15/02 | The Abduction | |
| 33 | E662 | Jan 05/03 | A Higher Echelon | |
| 34 | E663 | Jan 12/03 | The Getaway | |
| 35 | E665 | Jan 26/03 | Phase One | |
| 36 | E664 | Feb 02/03 | Double Agent | |
| 37 | E666 | Feb 09/03 | A Free Agent | |
| 38 | E667 | Feb 23/03 | Firebomb | |
| 39 | E668 | Mar 02/03 | A Dark Turn | |
| 40 | E669 | Mar 16/03 | Truth Takes Time | |
| 41 | E670 | Mar 30/03 | Endgame | |
| 42 | E671 | Apr 27/03 | Countdown | |
| 43 | E672 | May 04/03 | Second Double | |
| 44 | E673 | May 04/03 | The Telling | |
| Season Three | 22 color episodes in one hour format | |||
|---|---|---|---|---|
| Ep | PN | Airdate | Title | |
| 45 | 301 | Sep 28/03 | The Two | |
| 46 | 302 | Oct 05/03 | Succession | |
| 47 | 303 | Oct 12/03 | Reunion | |
| 48 | 304 | Oct 19/03 | A Missing Link | |
| 49 | 305 | Oct 26/03 | Repercussions | |
| 50 | 306 | Nov 02/03 | The Nemesis | |
| 51 | 307 | Nov 09/03 | Prelude | |
| 52 | 308 | Nov 23/03 | Breaking Point | |
| 53 | 309 | Nov 30/03 | Conscious | |
| 54 | 310 | Dec 07/03 | Remnants | |
| 55 | 311 | Jan 11/04 | Full Disclosure | |
| 56 | 312 | Jan 18/04 | Crossings | |
| 57 | 313 | Feb 15/04 | After Six | |
| 58 | 314 | Mar 07/04 | Blowback | |
| 59 | 315 | Mar 14/04 | Facade | |
| 60 | 316 | Mar 21/04 | Taken | |
| 61 | 317 | Mar 28/04 | The Frame | |
| 62 | 318 | Apr 11/04 | Unveiled | |
| 63 | 319 | Apr 18/04 | Hourglass | |
| 64 | 320 | Apr 25/04 | Blood Ties | |
| 65 | 321 | May 02/04 | Legacy | |
| 66 | 322 | May 23/04 | Resurrection | |
| Season Four | 22 color episodes in one hour format | |||
|---|---|---|---|---|
| Ep | PN | Airdate | Title | |
| 67 | 401 | Jan 05/05 | Authorized Personnel Only | |
| 68 | 402 | Jan 05/05 | Authorized Personnel Only, Part 2 | |
| 69 | 403 | Jan 12/05 | The Awful Truth | |
| 70 | 405 | Jan 19/05 | Ice | |
| 71 | 409 | Jan 26/05 | Welcome to Liberty Village | |
| 72 | 406 | Feb 09/05 | Nocturne | |
| 73 | 404 | Feb 16/05 | Detente | |
| 74 | 407 | Feb 23/05 | Echoes | |
| 75 | 408 | Mar 02/05 | A Man of His Word | |
| 76 | 410 | Mar 09/05 | The Index | |
| 77 | 411 | Mar 16/05 | The Road Home | |
| 78 | 412 | Mar 23/05 | The Orphan | |
| 79 | 416 | Mar 30/05 | Tuesday | |
| 80 | 413 | Apr 06/05 | Nightingale | |
| 81 | 414 | Apr 13/05 | Pandora | |
| 82 | 415 | Apr 20/05 | Another Mr. Sloane | |
| 83 | 417 | Apr 27/05 | A Clean Conscience | |
| 84 | 418 | May 04/05 | Mirage | |
| 85 | 419 | May 11/05 | In Dreams | |
| 86 | 420 | May 18/05 | The Descent | |
| 87 | 421 | May 18/05 | Search and Rescue | |
| 88 | 422 | May 25/05 | Before the Flood | |
| Season Five | 17 color episodes in one hour format | |||
|---|---|---|---|---|
| Ep | PN | Airdate | Title | |
| 89 | Sep 29/05 | Prophet Five | ||
| 90 | Oct 06/05 | ...1... | ||
| 91 | Oct 13/05 | The Shed | ||
| 92 | Oct 20/05 | Mockingbird | ||
| 93 | Oct 27/05 | Out of the Box | ||
| 94 | Nov 10/05 | Solo | ||
| 95 | Nov 17/05 | Fait Accompli | ||
| 96 | Dec 07/05 | Bob | ||
| 97 | Dec 14/05 | The Horizon | ||
| 98 | Apr 19/06 | S.O.S. | ||
| 99 | Apr 19/06 | Maternal Instinct | ||
| 100 | Apr 26/06 | There's Only One Sydney Bristow | ||
| 101 | May 03/06 | 30 Seconds | ||
| 102 | May 10/06 | I See Dead People | ||
| 103 | May 17/06 | No Hard Feelings | ||
| 104 | May 22/05 | Reprisal | ||
| 105 | May 22/05 | All the Time in the World | ||
