Jack's decision to set things right on the island is met with some strong resistance by those close to him,...

Events are revisited in the lives of the Oceanic 6 after their rescue from and return to the island.

Jack and Kate are at odds over the direction to take to save their fellow island survivors, and Locke further...

On the 100th episode milestone for the series, the time of reckoning has begun when Daniel Faraday comes clean...

Catch up with the stunning fifth season of LOST with the story of the Oceanic 6.

Suspicions about a possible breach intensify after Ben is taken from the infirmary, and a reluctant Miles is...

To atone for sins of the past, Ben must attempt to summon the smoke monster in order to be judged.

Kate goes to extreme measures to save Ben's life when Jack refuses to help. Meanwhile, Kate begins to tell the...

The face-off between the survivors and the freighter people continues, and the Oceanic Six find themselves...

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 freighter becomes perilous.

When Jack's health is seriously compromised, Kate and Juliet must learn to work together in order to save him.

Locke's camp comes under attack, and Jack tries to discover the identity of a body that has washed ashore.

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

Juliet is forced to reveal some startling news to Jin when Sun threatens to move to Locke's camp. Meanwhile,...

Juliet is forced to reveal some startling news to Jin when Sun threatens to move to Locke's camp. Meanwhile,...

Juliet receives an unwelcome visit from someone from her past and is given orders to track down Charlotte and...

Juliet receives an unwelcome visit from someone from her past and is given orders to track down Charlotte and...

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

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

Kate's need to get information out of the hostage may jeopardize her standing with Locke -- as well as with...

Kate's need to get information out of the hostage may jeopardize her standing with Locke -- as well as with...

Sayid and Kate go in search of Locke to negotiate a peaceful deal when they discover that his hostage may be...

Sayid and Kate go in search of Locke to negotiate a peaceful deal when they discover that his hostage may be...

The survivors begin to question the intentions of their supposed rescuers when four strangers arrive on the...

The survivors begin to question the intentions of their supposed rescuers when four strangers arrive on the...

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

Special enhanced episode with on-screen facts and back story. Jack and his fellow castaways begin their...

Special enhanced episode with on-screen facts and back story. Jack and his fellow castaways begin their...

Jack and the survivors wait for Charlie to turn off the others' signal-jamming device, not knowing that he has...

Desmond has another vision of Charlie's death, but this time his death ultimately will result in Claire's...

As Ben takes Locke to see Jacob and reveal the island's secrets, Ben's background on the island is exposed--as...

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

An unlikely person helps Desmond save the life of the mysterious woman who crashed onto the island, and Juliet...

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

Jack takes Juliet back to their camp after being abandoned by the others. However, nobody else at the camp...

With their secret location now compromised, the others abandon camp and take Locke with them. But they also...

Nikki and Paulo are two more of the castaways with a past just like any of the others. What have they been...

Jack tells Kate that he has made a deal with the others and is leaving via submarine tomorrow. But Locke blows...

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

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

Having returned to camp, Sawyer's help is enlisted by Hugo, who has an obsession with retrieving an old VW van...

Sawyer, Kate and Carl reaches their island at night, and the reluctant Kate wishes to return for Jack....

After Desmond saves Claire from drowning, Charlie and Hurley suspect that he can see the future. So they try...

Sawyer and Kate struggle to escape the island while Jack sabotages Ben's surgery, and Juliet's plan to make a...

Kate desperately tries to protect Sawyer from being killed by the others. But at the same time, the others...

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

The others perform a sadistic medical procedure on Sawyer in order to prevent him from causing any more...

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 and Jin's lives.

After discovering a sailboat just offshore containing former hatch oversee Desmond, Jack and Sayid come up...

Michael's whereabouts during his 13 days in captivity in the others camp are detailed while in the present, he...

Mr. Eko enlists Locke to help find a secret location he believes houses answers to the island's mysteries....

Jack and Kate bring an exhausted Michael back to camp where he has news about the others. Meanwhile, Ana Lucia...

Bernard tries to convince the survivors to build a S.O.S. signal with rocks on the sand, hoping to be seen by...

Hurley thinks the island is affecting him in a very strange way, and Libby attempts to offer support; Hurley...

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

When Sun comes to the realization that she might be pregnant, she struggles on whether to tell Jin. Ana-Lucia...

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

Mysterious French woman Danielle Rousseau returns to lead Sayid to a mysterious captive who claims he crashed...

Survivors fear that "The Others" may have returned when Sun is injured during a kidnapping attempt....

When Charlie's vividly surreal dreams lead him to believe Claire's baby, Aaron, is in danger, Locke suspects...

Jack, Locke and Sawyer follow Michael who left to look for his son. They meet the others. More is shown about...

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

Kate's original crime that started her life on the run is revealed. Meanwhile, the survivors lay one of their...

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

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

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

A desperate and growingly insane Michael sets off into the jungle by himself determined to find Walt, but...

Disturbing memories from Hurley's past cause him to struggle with a task to watch over the food storage...

Jack, Locke and Kate learn more secrets about the hatch. Meanwhile, Sawyer, Michael and Jin wonder if their...

Michael blames Sawyer for the abduction of Walt and promises to bring his son back. Meanwhile, Kate releases...

(Part I of II) The French woman -- Rousseau -- shocks the survivors by showing up with a dire warning about...

Jack suspects foul play when Michael becomes violently ill while building the raft. Meanwhile, a secret from...

After another funeral, tempers rise as the survivors' suspicions of each other grow, and an unlikely survivor...

Claire goes into labor while a helpless Charlie goes into panic mode. Meanwhile Locke is missing, Jack tends...

Locke thinks he's being sent a sign on how to get the hatch open, and he and Boone venture inland.

When Hurley becomes obsessed with the French woman and heads into the jungle to find her, Jack, Sayid and...

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

James "Sawyer" Ford wakes up from a nightmare with a boar inside his tent. He finds his canvas in...

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

John Locke is teaching Walt Lloyd to throw knives, and Michael Dawson feels jealous with the situation. He...

Boone Carlyle is jealous of Sayid Jarrah, because he becomes close to his half-sister Shannon Rutherford....

Kate and Sawyer discover a briefcase and the race begins to win ownership of it. Charlie is still depressed...

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

Claire begins to have reoccurring nightmares which one night result in her turning up with bloody hands, which...

Ashamed with his behavior torturing Sawyer, Sayid Jarrah decides to leave the group of survivors and travel...

Shannon is having an asthma attack, and Boone is sure that Sawyer has her medications- but he won't give it....

Charlie Pace is obliged by John Locke to stay clean and feels the effect. Meanwhile, Sayid Jarrah, Kate Austen...

Troubles escalate when Jin attacks Micheal for no reason. Soon, another secret is revealed when Sun reveals to...

Jack sees his father on the island, and goes searching after him- and after a source of water. Back at beach,...

After wild boars raid the beach camp in the middle of the night, the survivors find that they do not have any...

Kate, Charlie, Sawyer, Sayid, Boone and Shannon decide to keep the French transmission a secret from the other...

As Jack, Kate and Charlie return from their little "trip", Sayid is trying to fix the radio. He goes...