Locke tells Sawyer that he needs to come with him to kill Ben. But the man Locke wants him to kill is actually his father--who also happens to be a figure from Sawyer's past.

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An unlikely person helps Desmond save the life of the mysterious woman who crashed onto the island, and Juliet helps Sun find out whether she conceived on the island or before the plane crash.

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Desmond's latest vision suggests that his girlfriend Penny will crash-land onto the island. The vision also suggests that Charlie will die if he comes along with Desmond to rescue her, but Charlie must come along to make the vision come true.

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Jack takes Juliet back to their camp after being abandoned by the others. However, nobody else at the camp trusts her or wants her there, until she saves Claire's life.

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With their secret location now compromised, the others abandon camp and take Locke with them. But they also leave Juliet behind, handcuffed to Kate in the middle of the jungle.

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

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Jack tells Kate that he has made a deal with the others and is leaving via submarine tomorrow. But Locke blows up the submarine before Jack can leave, after having a long conversation with Ben about the island's powers.

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Claire launches a plan to use migratory birds to send a message, but she doesn't understand why Desmond keeps sabotaging it. Elsewhere on the island, Sayid, Locke and Kate scale the others' protective perimeter and discover their camp.

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Sayid, John and Kate find another Dharma station on their way to rescue Jack. In the meantime, Sawyer tries to get his stuff back in the camp.

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Having returned to camp, Sawyer's help is enlisted by Hugo, who has an obsession with retrieving an old VW van found on the island. More events in Hugo's life are also revealed, showing what brought him to be on the doomed flight.

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Sawyer, Kate and Carl reaches their island at night, and the reluctant Kate wishes to return for Jack. Meanwhile, Jack is interrogated by Isabel about the incident with Juliet and when she mentions the meaning of his tattoo, he recalls his vacation in the paradisiacal island of Phuket, in Thailand, where he dated the sexy, mystic and mysterious local Achara (Bai Ling).

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After Desmond saves Claire from drowning, Charlie and Hurley suspect that he can see the future. So they try to get him drunk to get some answers out of him.

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Sawyer and Kate struggle to escape the island while Jack sabotages Ben's surgery, and Juliet's plan to make a deal with Jack to kill Ben on the operating table is exposed.

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Kate desperately tries to protect Sawyer from being killed by the others. But at the same time, the others plan to use her as a pawn on Jack to get him to perform surgery on Ben.

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

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

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

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

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Now prisoners of the others, head games begin for Jack, Kate, and Sawyer.

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Michael's whereabouts during his 13 days in captivity in the others camp are detailed while in the present, he tries to convince Jack to help him mount a search party for his son Walt still being held captive. Meanwhile, Locke struggles with a choice whether or not to abandon the hatch.

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Mr. Eko enlists Locke to help find a secret location he believes houses answers to the island's mysteries. Meanwhile, Jack, Sawyer, and Kate struggle to cope with the horrific situation in the hatch following the escape of other Henry Gale, and of the shooting deaths of Ana Lucia and Libby, unaware that it was Michael who is responsible.

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Jack and Kate bring an exhausted Michael back to camp where he has news about the others. Meanwhile, Ana Lucia attempts to get the prisoner, Henry Gale to confess to being a spy for the others, and he attempts to kill her. Also, Hurley plans a surprise date for Libby.

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Bernard tries to convince the survivors to build a S.O.S. signal with rocks on the sand, hoping to be seen by a satellite or an airplane. His first encounter with Rose, who was terminal, and their romance, are disclosed through flashbacks. Bernard never gives up searching for the cure of Rose before crashing the island.

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Hurley begins to think the island is affecting him in a very strange way, so Libby attempts to offer him support. Hurley also recalls his past in a mental hospital with his friend Dave. Meanwhile, the prisoner calling himself Henry Gale offers new information about the Hatch, which severely shakes Locke's sense of purpose.

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When the hatch suddenly takes on a life of its own, Locke is trapped alone in the bunker and is forced to enlist the help of an unlikely ally: the captive Henry Gale to try to free him. Meanwhile, Jack faces off against Sawyer in a series of card games for supplies. Also, Ana Lucia, Sayid and Charlie find out the truth about Henry in the jungle.

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When Sun comes to the realization that she might be pregnant, she struggles on whether to tell Jin about the situation. After no success from Jack or Sayid, Ana Lucia is called in by Locke to interrogate the prisoner, Henry Gale, to get more information out of him about how he arrived on the island. Ana Lucia, Sayid, and Charlie then set out into the jungle to try and confirm Henry's story.

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When Claire's baby falls ill, she becomes determined to find out what happened to her to regain her memory during her captivity with the others, triggering flashbacks to her experience among the others, and her ordeals concerning her baby. Also, Mr. Eko learns about Henry Gale and asks Jack and Loche to give him a meeting with their captive.

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The mysterious French woman, Danielle Rousseau returns to lead Sayid to a mysterious captive who claims he crashed on the island. Meanwhile, Sawyer recruits Hurley to help him find another island animal that is harassing him: a loud tree frog.

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Survivors fear that the others may have returned when Sun is injured during a failed kidnapping attempt. Meanwhile, Sawyer is an amused, but highly interested, bystander when tension escalates between Jack, Locke, Kate and Ana Lucia over control of the hatch computer, and the storage of the weapons.

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When Charlie's vividly surreal dreams lead him to believe Claire's baby, Aaron, is in danger, Locke suspects Charlie may be using drugs again. More of Charlie's background story shows his difficult relationship with his heroin addicted brother. Meanwhile, Sawyer encourages Hurley to act on his attraction to Libby.

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

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Mr. Eko interrogates Charlie about the Virgin Mary statue, Claire begins to lose faith in Charlie when she discovers his secret, and Jack is an interested observer when Kate gives the recovering Sawyer a much-needed haircut.

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Kate's original crime that started her life on the run is revealed. Meanwhile, the survivors lay one of their own to rest, Kate sleeplessly watches over a feverish Sawyer, and Mr. Eko has a surprise for Locke regarding the hatch.

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

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

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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, Ana-Lucia, Mr. Eko, Bernard, Libby, and flight attendant Cindy. Meanwhile, Shannon is once again haunted by visions of Walt, but she cannot convince a skeptic Sayid that her visions are real. More of Shannon's background story shows her difficult relationship with her late half-brother Boone and further detailing how her step-mother financially cut her off after the death of their father. Also, Charlie becomes jealous of Locke's interest in Claire, while Locke learns that Charlie took a heroin stuffed porcelain statue from the Beechwood plane wreck.

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A desperate and growingly insane 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, the tail crash survivors, to take them to their camp. But they are delayed when Jin and the hulking Mr. Eko are forced to go into the jungle to look for Michael before the dreaded others find him first.

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Disturbing memories from Hurley's past cause him to struggle with a task he's assigned inside the hatch to watch over the food storage locker. Meanwhile Sawyer, Michael and Jin discover the identities of their captors whom are what's left of a group of two dozen Flight 815 survivors from the tail end of the plane led by the tough minded Ana-Lucia Cortez who insists they walk to a more secure location. Claire uncovers a shocking piece of information about the fate of the raft when the message bottled washes ashore.

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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 dreaded others.

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Michael is drowning and Sawyer saves him, while Jin is missing. Michael recalls his fight against Susan for Walt and the justice and the reasons for Michael's desperate obsession for his son.

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One of the castaways is chosen to descend into the mysterious hatch, and Shannon stumbles upon a shockingly familiar face in the jungle.

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(Part I of II) The French woman -- Rousseau -- shocks the survivors by showing up with a dire warning about the others. Meanwhile, Michael and Jin ready the raft for sailing.

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Jack suspects foul play when Michael becomes violently ill while building the raft. Meanwhile, a secret from Kate's past is revealed, the mysterious hatch is shown to a few of the survivors, and Walt gives Locke a warning.

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After burying one of their own, tempers flare as the castaways' suspicions of each other grow -- and an unlikely survivor vows revenge. Meanwhile, Claire and Charlie struggle to calm her newborn.

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Claire goes into labor while a helpless Charlie goes into panic mode. Meanwhile Locke is missing, Jack tends to a wounded survivor and Sayid presents Shannon with a romantic surprise.

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Locke begins to suffer physical difficulties as he and Boone try to find a way into the hatch; Jack is reluctant to offer assistance when Sawyer begins to experience excruciating headaches.

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When Hurley becomes obsessed with the French woman and heads into the jungle to find her, Jack, Sayid and Charlie have no choice but to follow. Meanwhile, Locke asks Claire to help build a mysterious item.

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When Jin Kwon is having a serious quarrel with his wife Sun Kwon, Michael Dawson defends her. Later, when Michael's raft is set afire and Jin has his arms injured by heat, Michael and Sawyer blame him for the incident. Sun finally reveals her secret when she speaks in English to defend her husband and he feels ashamed leaving her. Jin recalls how his love for Sun was destroyed by her evil and unscrupulous father.

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James "Sawyer" Ford wakes up from a nightmare with a boar inside his tent. He finds his canvas in the woods, but is attacked by the animal. He decides to chase the boar with Kate Austen following its track in the forest. Along their hunting, Sawyer recalls his dark past since he was a child until his final revenge against the con man that destroyed his family.

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After the missing Claire returns with no recollection of what has happened since before the doomed flight of Oceanic 815, Jack and Locke formulate a plan of defense against her kidnapper, the mysterious Ethan Rom, who threatens to kill off the other survivors unless Claire is returned to him.

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John Locke is teaching Walt Lloyd to throw knives, and Michael Dawson feels jealous with the situation. He forbids Walt to meet Locke, and recalls his romance with Walt's mother Susan Lloyd (Tamara Taylor), a overachieving executive who took the infant Walt away, and Michael having an awkward reunion 10 years later with the uncertain and spoiled Walt in Australia.

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Boone Carlyle is jealous of Sayid Jarrah, because he becomes close to his half-sister Shannon Rutherford. Boone tells John Locke that he wants to reveal the secret about the hatch in the woods to Shannon. Locke hits Boone, heals his head with a medicine and fastens him with a rope in a tree, living him alone in the forest.

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Kate and Sawyer discover a briefcase and the race begins to win ownership of it. Charlie is still depressed over Claire, and is given a sharp talking to by Rose.

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Jack, Kate, Locke and Boone go after Ethan, Claire and Charlie. They separate, and while Jack and Kate confront Ethan, Locke and Boon find another mystery at the jungle. Flashbacks reveal more about Jack's past with his dad.

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Claire begins to have reoccurring nightmares which one night result in her turning up with bloody hands, which leads Charlie to find out what is really going on. However, Jack isn't sure that anything really happened. Meanwhile, Hurley finds the flight manifest and discovers something shocking about a certain passenger.

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Ashamed with his behavior torturing Sawyer, Sayid Jarrah decides to leave the group of survivors and travel alone through the island, trying to find the source of transmission and map the place. He is arrested and tortured by the French survivor Danielle Rousseau and recalls his beloved Nadia back to his days years earlier in Iraq as part of the interrogation/torturer for the Republican Guard.

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Shannon is having an asthma attack, and Boone is sure that Sawyer has her medications- but he won't give it. As Kate's way to deal with this situation doesn't work, Sayid takes things into his own hands.

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Charlie Pace is obliged by John Locke to stay clean and feels the effect. Meanwhile, Sayid Jarrah, Kate Austen and James "Sawyer" Ford tries to triangulate the French distress signal through antennas to find where the transmission source is located. When the cave collapses burying Jack, Charlie rescues him and wins his inner battle against the drugs.

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Troubles escalate when Jin attacks Micheal for no reason. Soon, another secret is revealed when Sun reveals to Michael that she actually speaks English and is afraid of her controlling and jealous husband. Meanwhile, Jack goes with Kate, Locke and Charlie to the water source, and comes up with an idea: to move all the castaways into the caves. Jack and Sawyer try to convince Kate to move into their side. Also, Locke finds out about Charlie's heroin addiction.

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Jack sees his father on the island, and goes searching after him- and after a source of water. Back at beach, Claire faints and the few bottles of water that were left are gone. Who took them? Sawyer? Jin?

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After wild boars raid the beach camp in the middle of the night, the survivors find that they do not have any food and John Locke organizes a peccary hunting with Kate and Michael. Locke's background story reveals why he came to Australia on a spiritual retreat, and a miracle that happened to him after the crash.

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Kate, Charlie, Sawyer, Sayid, Boone and Shannon decide to keep the French transmission a secret from the other castaways not to alarm or panic them. Meanwhile, back at beach, Jack and Hurley find an incriminating mug-shot paper of Kate. A flashback to Kate's origins show the reason for her being in Australia.

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As Jack, Kate and Charlie return from their little "trip", Sayid is trying to fix the radio. He goes together with Kate, Boone, Sawyer, Shannon and Charlie to find a high place so the radio will work... and in the way they have a meeting with a little island "magic" being. Meanwhile, back at beach, Jack tries to help the US marshal, and some more secrets are revealed... some who include Charlie's drugs and Kate's handcuffs.

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The survivors of a plane crash have to get over the accident and collaborate to stay alive in a dangerous, mysterious island in the South Pacific.

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