| | episode | air date | countdown | title |
| S04E19 | 2010-02-08 | | Brave New World | |
| S04E18 | 2010-02-01 | | The Wall | |
| S04E17 | 2010-01-25 | | The Art of Deception | |
| S04E16 | 2010-01-18 | | Pass/Fail | |
| S04E15 | 2010-01-11 | | Close to You | |
| S04E14 | 2010-01-04 | | Let It Bleed | |
| S04E13 | 2010-01-04 | | Upon This Rock | |
| S04E12 | 2009-11-30 | | The Fifth Stage | |
| S04E11 | 2009-11-23 | | Thanksgiving | |
| S04E10 | 2009-11-16 | | Brother's Keeper | |
| S04E09 | 2009-11-09 | | Shadowboxing | |
| S04E08 | 2009-11-02 | | Once Upon a Time in Texas | |
| S04E07 | 2009-10-26 | | Strange Attractors | |
| S04E06 | 2009-10-19 | | Tabula Rasa | |
| S04E05 | 2009-10-12 | | Hysterical Blindness | |
| S04E04 | 2009-10-05 | | Acceptance | |
| S04E03 | 2009-09-28 | | Ink | |
| S04E02 | 2009-09-21 | | Jump, Push, Fall | |
| S04E01 | 2009-09-21 | | Orientation | |
| | | | S03E25 | 2009-04-27 | | An Invisible Thread | |
| S03E24 | 2009-04-20 | | I Am Sylar | |
| S03E23 | 2009-04-13 | | 1961 | |
| S03E22 | 2009-04-06 | | Turn and Face the Strange | |
| S03E21 | 2009-03-30 | | Into Asylum | |
| S03E20 | 2009-03-23 | | Cold Snap | |
| S03E19 | 2009-03-09 | | Shades of Gray | |
| S03E18 | 2009-03-02 | | Exposed | |
| S03E17 | 2009-02-23 | | Cold Wars | |
| S03E16 | 2009-02-16 | | Building 26 | |
| S03E15 | 2009-02-09 | | Trust and Blood | |
| S03E14 | 2009-02-02 | | A Clear and Present Danger | |
| S03E13 | 2008-12-15 | | Dual | |
| S03E12 | 2008-12-08 | | Our Father | |
| S03E11 | 2008-12-01 | | The Eclipse, Part 2 | |
| S03E10 | 2008-11-24 | | The Eclipse, Part 1 | |
| S03E09 | 2008-11-17 | | It's Coming | |
| S03E08 | 2008-11-10 | | Villains | |
| S03E07 | 2008-10-27 | | Eris Quod Sum | |
| S03E06 | 2008-10-20 | | Dying of the Light | |
| S03E05 | 2008-10-13 | | Angels and Monsters | |
| S03E04 | 2008-10-06 | | I Am Become Death | |
| S03E03 | 2008-09-29 | | One of Us, One of Them | |
| S03E02 | 2008-09-22 | | The Butterfly Effect | |
| S03E01 | 2008-09-22 | | The Second Coming | |
| | | | S02E11 | 2007-12-03 | | Powerless | |
| S02E10 | 2007-11-26 | | Truth & Consequences | |
| S02E09 | 2007-11-19 | | Cautionary Tales | |
| S02E08 | 2007-11-12 | | Four Months Ago... | |
| S02E07 | 2007-11-05 | | Out of Time | |
| S02E06 | 2007-10-29 | | The Line | |
| S02E05 | 2007-10-22 | | Fight Or Flight | |
| S02E04 | 2007-10-15 | | The Kindness of Strangers | |
| S02E03 | 2007-10-08 | | Kindred | |
| S02E02 | 2007-10-01 | | Lizards | |
| S02E01 | 2007-09-24 | | Four Months Later... | |
| | | S01E23 | 2007-05-21 | | How to Stop an Exploding Man | |
| S01E22 | 2007-05-14 | | Landslide | |
| S01E21 | 2007-05-07 | | The Hard Part | |
| S01E20 | 2007-04-30 | | Five Years Gone | |
| S01E19 | 2007-04-23 | | .07% | |
| S01E18 | 2007-03-05 | | Parasite | |
| S01E17 | 2007-02-26 | | Company Man | |
| S01E16 | 2007-02-19 | | Unexpected | |
| S01E15 | 2007-02-12 | | Run! | |
| S01E14 | 2007-02-05 | | Distractions | |
| S01E13 | 2007-01-29 | | The Fix | |
| S01E12 | 2007-01-22 | | Godsend | |
| S01E11 | 2006-12-04 | | Fallout | |
| S01E10 | 2006-11-27 | | Six Months Ago | |
| S01E09 | 2006-11-20 | | Homecoming | |
| S01E08 | 2006-11-13 | | Seven Minutes to Midnight | |
| S01E07 | 2006-11-06 | | Nothing to Hide | |
| S01E06 | 2006-10-30 | | Better Halves | |
| S01E05 | 2006-10-23 | | Hiros | |
| S01E04 | 2006-10-16 | | Collision | |
| S01E03 | 2006-10-09 | | One Giant Leap | |
| S01E02 | 2006-10-02 | | Don't Look Back | |
| S01E01 | 2006-09-25 | | Genesis | |
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