Season 4
Artwork
| # | Image | Title | Aired |
|---|---|---|---|
| 1 |  | Showdown | Sep 29, 2005 |
| 2 |  | Safe | Oct 6, 2005 |
| 3 |  | From the Ashes | Oct 13, 2005 |
| 4 |  | Lost Time | Oct 20, 2005 |
| 5 |  | Honor Bound | Oct 27, 2005 |
| 6 |  | Viuda Negra | Nov 3, 2005 |
| 7 |  | The Innocents | Nov 10, 2005 |
| 8 |  | A Day in the Life | Nov 17, 2005 |
| 9 |  | Freefall | Nov 24, 2005 |
| 10 |  | When Darkness Falls | Dec 8, 2005 |
| 11 |  | Blood Out | Jan 5, 2006 |
| 12 |  | Patient X | Jan 19, 2006 |
| 13 |  | Rage | Jan 26, 2006 |
| 14 |  | Odds or Evens | Feb 2, 2006 |
| 15 |  | The Stranger | Feb 9, 2006 |
| 16 |  | The Little Things | Mar 2, 2006 |
| 17 |  | Check Your Head | Mar 9, 2006 |
| 18 |  | The Road Home | Mar 30, 2006 |
| 19 |  | Expectations | Apr 13, 2006 |
| 20 |  | More Than This | Apr 20, 2006 |
| 21 |  | Shattered | Apr 27, 2006 |
| 22 |  | Requiem | May 4, 2006 |
| 23 |  | White Balance | May 11, 2006 |
| 24 |  | Crossroads | May 18, 2006 |