The two-part season three finale is a game-changer. On the island, the survivors make a desperate attempt to contact a nearby ...

My goodness. 110. “Whatever the Case May Be” (Season 1, Episode 11): The first episode of Lost to not really know what it’s doing.

That's inevitable, in some ways. Lost ran six seasons, and for three of those, it produced more than 20 episodes. Any show will produce some bum hours in that timeframe.

1) “The Constant” (Season 4, Episode 5): Desmond and Penny’s story became the heart of “Lost” so quickly that it’s easy to forget they weren’t always there.

At the end of a perfect first season for Lost is one of the best season finales for the show: “Exodus.” This episode consists of two parts and combines everything that’s great about the show.

10. "LaFleur" (season 5, episode 8) Our 10th pick marks the most thrilling moment in one of Lost 's most underrated (and conceptually bananas) storylines: season 5’s time travel arc.