Season 1 (2004)
7.57 avg 6 episodes 7.5 → 7.8 42 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 0 | Pilot: Part 1 | 7.5 | 256 |
| 1 | Pilot: Part 2 | 7.8 | 878 |
| 2 | The New and Improved Carl Morrissey | 7.5 | 687 |
| 3 | Becoming | 7.4 | 630 |
| 4 | Trial by Fire | 7.4 | 603 |
| 5 | White Light | 7.8 | 607 |
Seasons
Season 3 (2006)
7.48 avg 13 episodes 7.4 → 8.1 46 min avg
- Big finale
- Rebound
| # | Title | Rating | Votes |
|---|---|---|---|
| 0 | Unlocking the Secrets | 7.4 | 204 |
| 1 | The New World | 7.6 | 462 |
| 2 | Being Tom Baldwin | 7.4 | 419 |
| 3 | Gone: Part 1 | 7.7 | 424 |
| 4 | Gone: Part 2 | 7.8 | 407 |
| 5 | Graduation Day | 7.3 | 391 |
| 6 | The Home Front | 7.0 | 378 |
| 7 | Blink | 7.0 | 384 |
| 8 | The Ballad of Kevin and Tess | 7.4 | 405 |
| 9 | The Starzl Mutation | 7.5 | 379 |
| 10 | The Gospel According to Collier | 7.7 | 371 |
| 11 | Terrible Swift Sword | 7.4 | 383 |
| 12 | Fifty-Fifty | 8.1 | 436 |
Season 4 (2007)
7.59 avg 13 episodes 7.5 → 8.2 42 min avg
- Big finale
- saved-best-for-last
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Wrath of Graham | 7.5 | 426 |
| 2 | Fear Itself | 7.3 | 358 |
| 3 | Audrey Parker's Come and Gone | 7.5 | 358 |
| 4 | The Truth and Nothing But the Truth | 7.6 | 342 |
| 5 | Try the Pie | 7.8 | 351 |
| 6 | The Marked | 7.9 | 356 |
| 7 | Till We Have Built Jerusalem | 7.7 | 349 |
| 8 | No Exit | 7.5 | 368 |
| 9 | Daddy's Little Girl | 7.3 | 386 |
| 10 | One of Us | 7.5 | 349 |
| 11 | Ghost in the Machine | 7.3 | 357 |
| 12 | Tiny Machines | 7.6 | 355 |
| 13 | The Great Leap Forward | 8.2 | 488 |