Seasons
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Season 1 Sep. 22, 2004
- Episode 1: Pilot Part 1
- Episode 2: Pilot Part 2
- Episode 3: Tabula Rasa
- Episode 4: Walkabout
- Episode 5: White Rabbit
- Episode 6: House of the Rising Sun
- Episode 7: The Moth
- Episode 8: Confidence Man
- Episode 9: Solitary
- Episode 10: Raised by Another
- Episode 11: All the Best Cowboys Have Daddy Issues
- Episode 12: Whatever the Case May Be
- Episode 13: Hearts and Minds
- Episode 14: Special
- Episode 15: Homecoming
- Episode 16: Outlaws
- Episode 17: ...In Translation
- Episode 18: Numbers
- Episode 19: Deus Ex Machina
- Episode 20: Do No Harm
- Episode 21: The Greater Good
- Episode 22: Born to Run
- Episode 23: Exodus Part 1
- Episode 24: Exodus Part 2
Season 2 Sep. 21, 2005
- Episode 1: Man of Science, Man of Faith
- Episode 2: Adrift
- Episode 3: Orientation
- Episode 4: Everybody Hates Hugo
- Episode 5: ...And Found
- Episode 6: Abandoned
- Episode 7: The Other 48 Days
- Episode 8: Collision
- Episode 9: What Kate Did
- Episode 10: The 23rd Psalm
- Episode 11: The Hunting Party
- Episode 12: Fire + Water
- Episode 13: The Long Con
- Episode 14: One of Them
- Episode 15: Maternity Leave
- Episode 16: The Whole Truth
- Episode 17: Lockdown
- Episode 18: Dave
- Episode 19: S.O.S.
- Episode 20: Two for the Road
- Episode 21: ?
- Episode 22: Three Minutes
- Episode 23: Live Together, Die Alone (1)
- Episode 24: Live Together, Die Alone (2)
Season 3 Oct. 04, 2006
- Episode 1: A Tale of Two Cities
- Episode 2: The Glass Ballerina
- Episode 3: Further Instructions
- Episode 4: Every Man for Himself
- Episode 5: The Cost of Living
- Episode 6: I Do
- Episode 7: Not in Portland
- Episode 8: Flashes Before Your Eyes
- Episode 9: Stranger in a Strange Land
- Episode 10: Tricia Tanaka Is Dead
- Episode 11: Enter 77
- Episode 12: Par Avion
- Episode 13: The Man from Tallahassee
- Episode 14: Exposé
- Episode 15: Left Behind
- Episode 16: One of Us
- Episode 17: Catch-22
- Episode 18: D.O.C.
- Episode 19: The Brig
- Episode 20: The Man Behind the Curtain
- Episode 21: Greatest Hits
- Episode 22: Through the Looking Glass (1)
- Episode 23: Through The Looking Glass (2)
Season 4 Jan. 31, 2008
- Episode 1: The Beginning of the End
- Episode 2: Confirmed Dead
- Episode 3: The Economist
- Episode 4: Eggtown
- Episode 5: The Constant
- Episode 6: The Other Woman
- Episode 7: Ji Yeon
- Episode 8: Meet Kevin Johnson
- Episode 9: The Shape of Things to Come
- Episode 10: Something Nice Back Home
- Episode 11: Cabin Fever
- Episode 12: There's No Place Like Home (1)
- Episode 13: There's No Place Like Home (2)
- Episode 14: There's No Place Like Home (3)
Season 5 Jan. 21, 2009
- Episode 1: Because You Left
- Episode 2: The Lie
- Episode 3: Jughead
- Episode 4: The Little Prince
- Episode 5: This Place Is Death
- Episode 6: 316
- Episode 7: The Life and Death of Jeremy Bentham
- Episode 8: LaFleur
- Episode 9: Namaste
- Episode 10: He's Our You
- Episode 11: Whatever Happened, Happened
- Episode 12: Dead Is Dead
- Episode 13: Some Like It Hoth
- Episode 14: The Variable
- Episode 15: Follow the Leader
- Episode 16: The Incident (1)
- Episode 17: The Incident (2)
Season 6 Feb. 02, 2010
- Episode 1: LA X (1)
- Episode 2: LA X (2)
- Episode 3: What Kate Does
- Episode 4: The Substitute
- Episode 5: Lighthouse
- Episode 6: Sundown
- Episode 7: Dr. Linus
- Episode 8: Recon
- Episode 9: Ab Aeterno
- Episode 10: The Package
- Episode 11: Happily Ever After
- Episode 12: Everybody Loves Hugo
- Episode 13: The Last Recruit
- Episode 14: The Candidate
- Episode 15: Across the Sea
- Episode 16: What They Died For
- Episode 17: The End (1)
- Episode 18: The End (2)
- Episode 19: New Man In Charge
Lost Season 5 Episode 4
Kate discovers that someone knows the secret of Aaron’s true parental lineage. Meanwhile, the dramatic shifts through time are placing the lives of the remaining island survivors in extreme peril.