| Title | Season | Episode # | First Aired |
|---|---|---|---|
| A Bad Turn | 2 | 44 | Wednesday October 26, 2005 |
| A Fine Mess | 2 | 40 | Thursday October 6, 2005 |
| A Great Day | 2 | 30 | Thursday September 22, 2005 |
| A Lack of Goodwill | 4 | 82 | Saturday September 22, 2007 |
| A Space Oddity | 4 | 88 | Saturday November 17, 2007 |
| Aelita | 3 | 59 | Wednesday October 11, 2006 |
| Amnesia | 1 | 17 | Tuesday May 11, 2004 |
| Attack of the Zombies | 2 | 38 | Tuesday October 4, 2005 |
| Bad Connection | 4 | 92 | |
| Big Bug | 1 | 5 | Friday April 23, 2004 |
| Bragging Rights | 4 | 80 | Saturday September 8, 2007 |
| Canine Conundrum | 4 | 87 | Saturday November 10, 2007 |
| Claustrophobia | 1 | 16 | Monday May 10, 2004 |
| Code: Earth | 1 | 25 | Friday May 21, 2004 |
| Cold Sweat | 4 | 93 | |
| Cold War | 2 | 43 | Tuesday October 25, 2005 |
| Common Interest | 2 | 37 | Monday October 3, 2005 |
| Contact | 2 | 50 | Friday November 25, 2005 |
| Cousins Once Removed | 4 | 89 | Saturday November 17, 2007 |
| Crash Course | 4 | 74 | Tuesday July 17, 2007 |
| Cruel Dilemma | 1 | 6 | Monday April 26, 2004 |
| Deja Vu | 2 | 45 | Thursday October 27, 2005 |
| Distant Memory | 4 | 83 | Saturday September 29, 2007 |
| Dog Day Afternoon | 4 | 81 | Saturday September 15, 2007 |
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