| Title | Season | Episode # | First Aired |
|---|---|---|---|
| William Returns | 4 | 68 | Friday May 18, 2007 |
| Double Take | 4 | 69 | Tuesday June 12, 2007 |
| Opening Act | 4 | 70 | Tuesday June 19, 2007 |
| Wreck Room | 4 | 71 | Tuesday June 26, 2007 |
| Skidbladnir | 4 | 72 | Tuesday July 3, 2007 |
| Maiden Voyage | 4 | 73 | Tuesday July 10, 2007 |
| Crash Course | 4 | 74 | Tuesday July 17, 2007 |
| Replika | 4 | 75 | Tuesday July 24, 2007 |
| I'd Rather Not Talk About It | 4 | 76 | Tuesday July 31, 2007 |
| Hot Shower | 4 | 77 | Tuesday August 14, 2007 |
| Lost at Sea | 4 | 78 | Tuesday August 28, 2007 |
| The Lake | 4 | 79 | Tuesday August 21, 2007 |
| Bragging Rights | 4 | 80 | Saturday September 8, 2007 |
| Dog Day Afternoon | 4 | 81 | Saturday September 15, 2007 |
| A Lack of Goodwill | 4 | 82 | Saturday September 22, 2007 |
| Distant Memory | 4 | 83 | Saturday September 29, 2007 |
| Hard Luck | 4 | 84 | Saturday October 6, 2007 |
| Guided Missile | 4 | 85 | Saturday October 13, 2007 |
| Kadic Bombshell | 4 | 86 | Saturday November 3, 2007 |
| Canine Conundrum | 4 | 87 | Saturday November 10, 2007 |
| A Space Oddity | 4 | 88 | Saturday November 17, 2007 |
| Cousins Once Removed | 4 | 89 | Saturday November 17, 2007 |
| Music to Soothe the Savage Beast | 4 | 90 | |
| Wrong Exposure | 4 | 91 | |
| Bad Connection | 4 | 92 | |
| Cold Sweat | 4 | 93 | |
| Down to Earth | 4 | 94 | |
| Fight to the Finish | 4 | 95 | |
| Echoes | 4 | 96 | |
| Lab Rat | 4 | 97 |