A mysterious illness that baby Aaron suddenly contracts sends a desperate Claire, Kate and French woman Danielle to return to the same area where Claire was initially kidnapped. It is…

Sun comes to the realization that she might be pregnant. She struggles on whether to tell Jin about the situation. Meanwhile, with no success from Jack or Sayid, Ana-Lucia is…

When the hatch suddenly takes on a life of its own, Locke is forced to enlist the help of an unlikely ally to control the matter. Meanwhile, Ana Lucia, Sayid…

Libby lends a helping hand to Hurley to support him when he begins to think the island is having a strange effect on him. Hurley begins to see Dave (guest-star…

Rose is surprisingly and vehemently opposed to Bernard’s plan to create an S.O.S. signal; romantic sparks are rekindled between Jack and Kate when they trek into the jungle to propose…

After finding an exhausted Michael in the forest, Jack and Kate bring him back to the main camp. When he finally wakes up, Michael has some new details about “The…

Mr. Eko has dreams about his brother leading him somewhere. He seeks Locke’s help in finding a secret location, the “question mark.” Meanwhile, Jack and the other survivors grapple with…

A determined Michael convinces Jack and several castaways to help him rescue Walt from “The Others.” With Jack away, Locke is left in charge of the hatch and must decide…

After discovering something odd just offshore, Jack and Sayid come up with a plan to confront “The Others” and hopefully get Walt back. At the same time there will be…

After discovering something odd just offshore, Jack and Sayid come up with a plan to confront “The Others” and hopefully get Walt back. Meanwhile, Eko and Locke come to blows…

With the abduction of Walt fresh on their minds, their raft destroyed, and Jin missing, Michael and Sawyer fight for their lives in the middle of nowhere in the ocean…

Jack, Locke and Kate learn more secrets about the hatch. Meanwhile, after being beaten and taken captive, Sawyer, Michael and Jin wonder if their captors are fellow survivors or the…

Hurley struggles with an assigned task inside the hatch as he flashbacks to disturbing memories in his life before the crash. Meanwhile, Sawyer, Michael and Jin learn the identities of…

Michael sets off into the jungle by himself determined to find Walt, but discovers that he is not alone. Meanwhile, Sawyer and Jin are ordered by their captors to take…

Sawyer’s wound becomes life-threatening as he, Michael and Jin make their way through the interior of the island with the tail section survivors. Meanwhile, Shannon is once again haunted by…

The harrowing first 48 days in the lives of the tail section survivors are revealed. Flashbacks reveal the point of view of Ana-Lucia, Mr. Eko, Bernard and Libby and other…

Violence erupts when Ana Lucia and her group stumble upon Sayid and the other castaways on the island. Ana Lucia holds Sayid captive. Kate and Jack care for Sawyer when…

As Kate’s backstory continues, her original crime is revealed. She thinks something is haunting her through Sawyer. Locke and Eko make an interesting discovery about the film, and Michael has…

This episode will shed more light on why Eko took a mysterious 40-day vow of silence, and possibly information on his stick. Also, Claire begins to lose faith in Charlie…

Jack, Locke and Sawyer follow after a determined Michael after he heads into the jungle toward the dreaded “Others” in search of Walt. Meanwhile, Sun has a surprising reaction to…

When Charlie’s vividly surreal dreams lead him to believe Claire’s baby, Aaron, is in danger, Locke suspects Charlie may be using again. Meanwhile, Sawyer encourages Hurley to act on his…

Some of the island survivors fear that “The Others” may have returned when Sun is greatly injured during a failed kidnapping attempt at her plant garden. Also, the trust barrier…

After Sun is attacked, some of the survivors begin to think that one of the “other survivors” might be one of “The Others.” When French woman Danielle Rousseau leads Sayid…

Jack, Locke and Kate explore the mysterious hatch but Jack decides to wait before going down into the hatch. Kate and Locke aren’t so patient. When Shannon chases after Vincent…