| Episodes | Name | Date | Rating |
|---|---|---|---|
| S1 EP1 | Air: Part 1 | 2009-10-02 | 6.8 |
| S1 EP2 | Air: Part 2 | 2009-10-02 | 7.1 |
| S1 EP3 | Air: Part 3 | 2009-10-09 | 6.9 |
| S1 EP4 | Darkness | 2009-10-16 | 7.1 |
| S1 EP5 | Light | 2009-10-23 | 7.6 |
| S1 EP6 | Water | 2009-10-30 | 6.4 |
| S1 EP7 | Earth | 2009-11-06 | 6.8 |
| S1 EP8 | Time | 2009-11-13 | 7.1 |
| S1 EP9 | Life | 2009-11-20 | 6.5 |
| S1 EP10 | Justice | 2009-12-04 | 7.3 |
| S1 EP11 | Space | 2010-04-02 | 6.7 |
| S1 EP12 | Divided | 2010-04-09 | 7.3 |
| S1 EP13 | Faith | 2010-04-16 | 6.8 |
| S1 EP14 | Human | 2010-04-23 | 7.2 |
| S1 EP15 | Lost | 2010-04-30 | 7.7 |
| S1 EP16 | Sabotage | 2010-05-07 | 7.6 |
| S1 EP17 | Pain | 2010-05-14 | 6.9 |
| S1 EP18 | Subversion | 2010-05-21 | 7.9 |
| S1 EP19 | Incursion: Part 1 | 2010-06-04 | 7.9 |
| S1 EP20 | Incursion: Part 2 | 2010-06-11 | 8 |
| S2 EP1 | Intervention | 2010-09-28 | 7.6 |
| S2 EP2 | Aftermath | 2010-10-05 | 7.5 |
| S2 EP3 | Awakening | 2010-10-12 | 7.7 |
| S2 EP4 | Pathogen | 2010-10-19 | 7.6 |
| S2 EP5 | Cloverdale | 2010-10-26 | 6.3 |
| S2 EP6 | Trial and Error | 2010-11-02 | 7.4 |
| S2 EP7 | The Greater Good | 2010-11-09 | 7.9 |
| S2 EP8 | Malice | 2010-11-16 | 7.8 |
| S2 EP9 | Visitation | 2010-11-23 | 7.5 |
| S2 EP10 | Resurgence | 2010-11-30 | 7.8 |
| S2 EP11 | Deliverance | 2011-03-07 | 7.9 |
| S2 EP12 | Twin Destinies | 2011-03-14 | 7.9 |
| S2 EP13 | Alliances | 2011-03-21 | 7.4 |
| S2 EP14 | Hope | 2011-03-28 | 7.9 |
| S2 EP15 | Seizure | 2011-04-04 | 8 |
| S2 EP16 | The Hunt | 2011-04-11 | 7.3 |
| S2 EP17 | Common Descent | 2011-04-18 | 8.2 |
| S2 EP18 | Epilogue | 2011-04-25 | 8.1 |
| S2 EP19 | Blockade | 2011-05-02 | 7.8 |
| S2 EP20 | Gauntlet | 2011-05-09 | 7.3 |