| Title | Season | Episode # | First Aired |
|---|---|---|---|
| The Reformatting | 4 | 1 | 18 Sep 99 |
| Master of the House | 4 | 2 | 25 Sep 99 |
| Fires of the Past | 4 | 3 | 2 Oct 99 |
| Mercenary Pursuits | 4 | 4 | 9 Oct 99 |
| Forbidden Fruit | 4 | 5 | 16 Oct 99 |
| The Weak Component | 4 | 6 | 23 Oct 99 |
| Revelations (1): Discovery | 4 | 7 | 30 Oct 99 |
| Revelations (2): Descent | 4 | 8 | 6 Nov 99 |
| Revelations (3): Apocalypse | 4 | 9 | 13 Nov 99 |
| Survivor | 4 | 10 | 27 Nov 99 |
| The Key (Techno-Organic War 1) | 4 | 11 | 4 Dec 99 |
| The Catalyst (Techno-Organic War 2) | 4 | 12 | 11 Dec 99 |
| End of the Line (Techno-Organic War 3) | 4 | 13 | 18 Dec 99 |