| Season One | 13 color episodes in 30 minute format | ||
|---|---|---|---|
| Ep | PN | Airdate | Title |
| 1 | 101 | Oct 05/02 | Wormhole |
| 2 | 102 | Oct 12/02 | Invisible |
| 3 | 103 | Oct 19/02 | Magnet |
| 4 | 104 | Nov 16/02 | Thursday |
| 5 | 105 | Nov 23/02 | Lifetime |
| 6 | 106 | Dec 07/02 | Fate |
| 7 | 107 | Dec 14/02 | Culture |
| 8 | 108 | Jan 04/03 | Radio |
| 9 | 109 | Jan 11/03 | Storm |
| 10 | 110 | Jan 18/03 | Who |
| 11 | 111 | Jan 25/03 | Lost |
| 12 | 112 | Feb 01/03 | Robot |
| 13 | 113 | Mar 01/03 | Shrink |
| Season Two | 13 color episodes in 30 minute format | ||
|---|---|---|---|
| Ep | PN | Airdate | Title |
| 14 | 201 | Sep 13/03 | Wormhole 2 |
| 15 | 202 | Sep 20/03 | Pheromones |
| 16 | 203 | Sep 27/03 | Cold |
| 17 | 204 | Oct 04/03 | Genome |
| 18 | 205 | Oct 11/03 | Brainwaves |
| 19 | 206 | Oct 18/03 | Chemistry |
| 20 | 207 | Nov 01/03(CA) | Ecosystem |
| 21 | 208 | Dec 02/03(UK) | Technology |
| 22 | 209 | Dec 04/03(UK) | Equation |
| 23 | 210 | Nov 08/03(CA) | Hemispheres |
| 24 | 211 | Dec 08/03(UK) | Nutrition |
| 25 | 212 | Nov 29/03(CA) | Echolocation |
| 26 | 213 | Dec 06/03(CA) | Stopwatch |
| Season Three | 13 color episodes in 30 minute format | ||
|---|---|---|---|
| Ep | PN | Airdate | Title |
| 27 | Sep 04/04 | Transference | |
| 28 | Sep 11/04 | Nocturnal | |
| 29 | Sep 25/04 | Allure | |
| 30 | Oct 02/04 | Tesseract | |
| 31 | Oct 09/04 | Camouflage | |
| 32 | Oct 30/04 | Nanotechnology | |
| 33 | Dec 04/04 | Vision | |
| 34 | Dec 11/04 | Hologram | |
| 35 | Jan 08/05 | Probability | |
| 36 | Jan 15/05 | Chirality | |
| 37 | Jan 22/05 | Friction | |
| 38 | Feb 26/05(CA) | Past | |
| 39 | Mar 05/05(CA) | Inquiry | |
| Season Four | 3 color episodes in 30 minute format | ||
|---|---|---|---|
| Ep | PN | Airdate | Title |
| 40 | Dec 26/05(CA) | Conclusions | |
| 41 | Dec 26/05(CA) | Conclusions, Part 2 | |
| 42 | Jan 02/06(CA) | Conclusions, Part 3 | |
