Threshold: Season 1
This season started on September 16, 2005. The table lists episodes with recorded air dates up to September 28, 2026.
| Ep | Title and air date | My place |
|---|---|---|
| 1 | Trees Made of Glass (1) · 41 min | |
| 2 | Trees Made of Glass (2) · 41 min | |
| 3 | Blood of the Children · 41 min | |
| 4 | The Burning · 41 min | |
| 5 | Shock · 41 min | |
| 6 | Pulse · 41 min | |
| 7 | The Order · 41 min | |
| 8 | Revelations · 41 min | |
| 9 | Progeny · 41 min | |
| 10 | The Crossing · 41 min | |
| 11 | Outbreak (a.k.a. Escalation) · 41 min | |
| 12 | Vigilante · 41 min | |
| 13 | Alienville · 41 min |