| | episode | air date | countdown | title |
| S02E20 | 2011-05-09 | | Gauntlet | |
| S02E19 | 2011-05-02 | | Blockade | |
| S02E18 | 2011-04-25 | | Epilogue | |
| S02E17 | 2011-04-18 | | Common Descent | |
| S02E16 | 2011-04-11 | | The Hunt | |
| S02E15 | 2011-04-04 | | Seizure | |
| S02E14 | 2011-03-28 | | Hope | |
| S02E13 | 2011-03-21 | | Alliances | |
| S02E12 | 2011-03-14 | | Twin Destinies | |
| S02E11 | 2011-03-07 | | Deliverance (2) | |
| S02E10 | 2010-11-30 | | Resurgence (1) | |
| S02E09 | 2010-11-23 | | Visitation | |
| S02E08 | 2010-11-16 | | Malice | |
| S02E07 | 2010-11-09 | | The Greater Good | |
| S02E06 | 2010-11-02 | | Trial and Error | |
| S02E05 | 2010-10-26 | | Cloverdale | |
| S02E04 | 2010-10-19 | | Pathogen | |
| S02E03 | 2010-10-12 | | Awakenings | |
| S02E02 | 2010-10-05 | | Aftermath | |
| S02E01 | 2010-09-28 | | Intervention (3) | |
| | | | S01E20 | 2010-06-11 | | Incursion (2) | |
| S01E19 | 2010-06-04 | | Incursion (1) | |
| S01E18 | 2010-05-21 | | Subversion | |
| S01E17 | 2010-05-14 | | Pain | |
| S01E16 | 2010-05-07 | | Sabotage | |
| S01E15 | 2010-04-30 | | Lost | |
| S01E14 | 2010-04-23 | | Human | |
| S01E13 | 2010-04-16 | | Faith | |
| S01E12 | 2010-04-09 | | Divided | |
| S01E11 | 2010-04-02 | | Space | |
| S01E10 | 2009-12-04 | | Justice | |
| S01E09 | 2009-11-20 | | Life | |
| S01E08 | 2009-11-13 | | Time | |
| S01E07 | 2009-11-06 | | Earth | |
| S01E06 | 2009-10-30 | | Water | |
| S01E05 | 2009-10-23 | | Light | |
| S01E04 | 2009-10-16 | | Darkness | |
| S01E03 | 2009-10-09 | | Air (3) | |
| S01E02 | 2009-10-02 | | Air (2) | |
| S01E01 | 2009-10-02 | | Air (1) | |
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