The face-off between the survivors and the freighter people continues, and the...

The face-off between the survivors and the freighter people begins.

Locke is enlightened as to the whereabouts of Jacob's cabin, and life aboard the...

When Jack's health is seriously compromised, Kate and Juliet must learn to work...

Locke's camp comes under attack, and Jack tries to discover the identity of a...

Sayid confronts Ben's spy on the freighter, and Ben urges daughter Alex to flee...

Juliet is forced to reveal some startling news to Jin when Sun threatens to move...

Juliet is forced to reveal some startling news to Jin when Sun threatens to move...

Juliet is forced to reveal some startling news to Jin when Sun threatens to move...

Juliet receives an unwelcome visit from someone from her past and is given...

Juliet receives an unwelcome visit from someone from her past and is given...

Sayid and Desmond hit a bit of turbulence on the way to the freighter, which...

Sayid and Desmond hit a bit of turbulence on the way to the freighter, which...

Kate's need to get information out of the hostage may jeopardize her standing...

Kate's need to get information out of the hostage may jeopardize her standing...

Sayid and Kate go in search of Locke to negotiate a peaceful deal when they...

Sayid and Kate go in search of Locke to negotiate a peaceful deal when they...

The survivors begin to question the intentions of their supposed rescuers when...

The survivors begin to question the intentions of their supposed rescuers when...

Feeling that their rescue is close at hand, the survivors don't know whether to...

Special enhanced episode with on-screen facts and back story. Jack and his...

Jack and the survivors wait for Charlie to turn off the others' signal-jamming...

Special enhanced episode with on-screen facts and back story. Jack and his...

Desmond has another vision of Charlie's death, but this time his death...

As Ben takes Locke to see Jacob and reveal the island's secrets, Ben's...

Locke tells Sawyer that he needs to come with him to kill Ben. But the man Locke...

An unlikely person helps Desmond save the life of the mysterious woman who...

Desmond's latest vision suggests that his girlfriend Penny will crash-land onto...

Jack takes Juliet back to their camp after being abandoned by the others....

With their secret location now compromised, the others abandon camp and take...

Nikki and Paulo are two more of the castaways with a past just like any of the...

Jack tells Kate that he has made a deal with the others and is leaving via...

Claire launches a plan to use migratory birds to send a message, but she doesn't...

Sayid, John and Kate find another Dharma station on their way to rescue Jack. In...

Having returned to camp, Sawyer's help is enlisted by Hugo, who has an obsession...

Sawyer, Kate and Carl reaches their island at night, and the reluctant Kate...

After Desmond saves Claire from drowning, Charlie and Hurley suspect that he can...

Sawyer and Kate struggle to escape the island while Jack sabotages Ben's...

After Mr. Eko has a vision of his dead brother, he sets out to return to the...

The others perform a sadistic medical procedure on Sawyer in order to prevent...

Locke experiences visions of Boone, leading him to a new mystery on the island.

Sayid's attempt to rescue Jack, Kate and Sawyer from the others jeopardizes Sun...

Hurley begins to think the island is affecting him in a very strange way, so...

When the hatch suddenly takes on a life of its own, Locke is trapped alone in...

When Sun comes to the realization that she might be pregnant, she struggles on...

When Claire's baby falls ill, she becomes determined to find out what happened...

The mysterious French woman, Danielle Rousseau returns to lead Sayid to a...

Survivors fear that the others may have returned when Sun is injured during a...

When Charlie's vividly surreal dreams lead him to believe Claire's baby, Aaron,...

Jack, Locke and Sawyer follow Michael who left to look for his son. They meet...

Mr. Eko interrogates Charlie about the Virgin Mary statue, Claire begins to lose...

Kate's original crime that started her life on the run is revealed. Meanwhile,...

Tempers flare when Ana Lucia and her group stumble upon Sayid and the other...

The harrowing first 48 days in the lives of the tail section survivors are...

Sawyer's wound becomes life-threatening as he, Michael and Jin make their way...

A desperate and growingly insane Michael sets off into the jungle by himself...

Disturbing memories from Hurley's past cause him to struggle with a task he's...

Jack, Locke and Kate learn more secrets about the hatch. Meanwhile, after being...

Michael is drowning and Sawyer saves him, while Jin is missing. Michael recalls...

(Part I of II) The French woman -- Rousseau -- shocks the survivors by showing...

Jack suspects foul play when Michael becomes violently ill while building the...

After burying one of their own, tempers flare as the castaways' suspicions of...

Claire goes into labor while a helpless Charlie goes into panic mode. Meanwhile...

Locke begins to suffer physical difficulties as he and Boone try to find a way...

When Hurley becomes obsessed with the French woman and heads into the jungle to...

When Jin Kwon is having a serious quarrel with his wife Sun Kwon, Michael Dawson...

James "Sawyer" Ford wakes up from a nightmare with a boar inside his...

After the missing Claire returns with no recollection of what has happened since...

John Locke is teaching Walt Lloyd to throw knives, and Michael Dawson feels...

Boone Carlyle is jealous of Sayid Jarrah, because he becomes close to his...

Kate and Sawyer discover a briefcase and the race begins to win ownership of it....

Jack, Kate, Locke and Boone go after Ethan, Claire and Charlie. They separate,...

Claire begins to have reoccurring nightmares which one night result in her...

Ashamed with his behavior torturing Sawyer, Sayid Jarrah decides to leave the...

Shannon is having an asthma attack, and Boone is sure that Sawyer has her...

Charlie Pace is obliged by John Locke to stay clean and feels the effect....

Troubles escalate when Jin attacks Micheal for no reason. Soon, another secret...

Jack sees his father on the island, and goes searching after him- and after a...

After wild boars raid the beach camp in the middle of the night, the survivors...

Kate, Charlie, Sawyer, Sayid, Boone and Shannon decide to keep the French...

As Jack, Kate and Charlie return from their little "trip", Sayid is...