
2001 – 2006
105 Episodes
43 min
| Ep 1 | Ep 2 | Ep 3 | Ep 4 | Ep 5 | Ep 6 | Ep 7 | Ep 8 | Ep 9 | Ep 10 | Ep 11 | Ep 12 | Ep 13 | Ep 14 | Ep 15 | Ep 16 | Ep 17 | Ep 18 | Ep 19 | Ep 20 | Ep 21 | Ep 22 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S1 | 8.7 | 8.2 | 7.9 | 8.1 | 8.0 | 8.0 | 8.1 | 8.1 | 8.2 | 8.1 | 8.0 | 8.6 | 8.6 | 7.9 | 8.0 | 8.1 | 7.9 | 8.0 | 8.1 | 8.2 | 8.4 | 8.6 |
| S2 | 8.5 | 8.0 | 7.9 | 7.7 | 7.8 | 7.8 | 7.8 | 8.3 | 8.2 | 8.0 | 8.2 | 8.0 | 8.9 | 8.0 | 7.7 | 7.8 | 8.0 | 8.0 | 8.0 | 7.8 | 8.2 | 8.5 |
| S3 | 8.2 | 7.7 | 7.7 | 7.8 | 7.7 | 7.8 | 7.8 | 8.0 | 8.0 | 7.8 | 8.5 | 7.7 | 7.7 | 7.8 | 8.0 | 7.8 | 7.8 | 7.8 | 8.0 | 7.7 | 7.8 | 8.2 |
| S4 | 7.6 | 7.9 | 7.9 | 7.7 | 8.3 | 7.7 | 7.6 | 7.5 | 7.6 | 7.9 | 7.6 | 7.4 | 8.1 | 7.9 | 7.7 | 7.7 | 7.7 | 7.7 | 7.6 | 7.9 | 8.0 | 8.3 |
| S5 | 8.0 | 7.6 | 8.0 | 7.9 | 7.6 | 7.9 | 7.7 | 7.7 | 7.6 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 |
Sydney Bristow, an agent who has been tricked to believe she is working for the U.S. government, is actually working for a criminal organization named the Alliance of Twelve. Upon learning this, Sydney becomes a double agent for the real CIA.