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episode 101 - Episode Title | Watch
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a commercial airliner flying from Sydney to Los Angeles, hits turbulance and breaks apart in mid-air and crashes on a deserted tropical island in the South Pacific, with forty-eight survivors of the initial crash. Mysterious roars are heard from the jungle and trees are found knocked over. Jack, Kate and Charlie set out into the jungle to find the cockpit of the airplane so they can send out a distress signal using the plane's transceiver. They also find the co-pilot, who survived the crash, but is soon killed by the mysterious "monster". A flashback shows Jack on the plane.


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episode 102 - Episode Title | Watch
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Kate, Sayid, Sawyer, Charlie, Shannon and Boone head out to take the transceiver inland in an attempt to reach higher ground and get a better signal. Along the way, they are attacked by a charging polar bear, which Sawyer shoots and kills. They are unable to send a signal with the transceiver due to the presence of another signal, a distress call (translated by Shannon) sent by a French woman that has been playing over and over for approximately sixteen years. Back at the beach, a federal marshal wakes up during his operation and asks Jack about Kate, who, in a flashback, is escorted by the marshal on the plane. In another flashback, Charlie is shown to have sneaked a small bag of heroin onto the plane.


episode 103 - Episode Title | Watch
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Jack learns about Kate's past as a fugitive. The signal party returns, but decides not to tell the others about the transmission. Sawyer shoots the dying marshal, thinking to relieve him of his misery. However, this only punctures his lung, so Jack - who had earlier rejected euthanasia as murder - finishes him off. Flashbacks show Kate's life on an Australian farm, until she is captured by the marshal.


episode 104 - Episode Title | Watch
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The fuselage, filled with decomposing bodies, is burned after it is raided by a group of wild boars. Locke successfully goes hunting for boar. Locke encounters the monster, but he does not tell anyone about this. In flashbacks, it is revealed that he was in a wheelchair before the plane crash and healed after the crash.


episode 105 - Episode Title | Watch
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Boone steals the decreasing water supply in a misguided attempt to help everyone, but the survivors turn on him. A sleep-deprived Jack chases after what appears to be his deceased father in the forests and eventually discovers caves with fresh water. Jack comes to terms with his role as leader. In flashbacks, Jack goes to Australia to retrieve his deceased father.


episode 106 - Episode Title | Watch
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Some of the survivors move to the caves, while some stay at the beach. Locke exchanges Charlie's heroin for Charlie's guitar. Jin attacks Michael because he has Jin's father-in-law's watch; however, only Jin's wife Sun knows this because they do not speak English. Jin is handcuffed to the wreckage. Sun reveals to Michael that she can speak English and explains why Jin attacked Michael, after which Michael frees Jin. Flashbacks show that Jin had to take a job working for Sun's father for her hand in marriage. One night, after they are married, Jin returns home covered in someone else's blood. Sun secretly plots to leave Jin; however, she changes her mind in the end.

episode 107 - Episode Title | Watch
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Charlie is suffering from withdrawal and asks Locke for his heroin, and Locke says that he will return the drugs the third time Charlie asks. Charlie later asks Locke for his heroin for the third time and Locke gives it back but Charlie destroys it. Charlie risks his life to rescue Jack after he is trapped in a cave-in. Flashbacks show Charlie and his brother Liam leading their band DriveSHAFT and, eventually, Liam gets Charlie hooked on heroin. Years later, Charlie visits Liam's house in Australia and wants him to rejoin DriveSHAFT for their comeback tour but a clean Liam refuses.


episode 108 - Episode Title | Watch
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Sawyer is suspected of hoarding some asthma inhalers from the wreck. Sayid tortures Sawyer, who reveals to Kate that he does not have them. Sayid sets off to explore the island's shoreline in self-imposed isolation, needing time to come to terms with his actions in torturing Sawyer. Kate reads a letter that Sawyer always carries around, which reveals that "Sawyer" is an alias. When Sawyer was a child, a man known as Sawyer conned and slept with his mother, who was killed by young Sawyer's father in a murder-suicide. Young Sawyer vowed, in the letter, to give the letter to the original Sawyer. Later, Sawyer became a con-man and took the name of the original Sawyer. In flashbacks, Sawyer tries to con a husband and wife, but gives up when he discovers that they have a son.


episode 109 - Episode Title | Watch
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Sayid finds a cable running out of the ocean and into the jungle. While following it, he is caught in a trap and captured by Rousseau, the woman who sent out the distress signal. Rousseau tells Sayid she was part of a science team, and that they crashed on the island sixteen years ago. She identifies a group of island inhabitants she calls the "Others" as the carriers of a sickness that her companions caught, and says that the Others whisper in the jungle. Sayid escapes and while trying to find his way back to camp, Sayid hears the whispering she told him about. In flashbacks, Sayid is tasked with torturing a prisoner named Nadia, who was a childhood friend. Sayid's superior tells him to execute Nadia, but instead he helps her escape.


episode 110 - Episode Title | Watch
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A badly wounded Sayid returns to camp and tells the others about Rousseau and that there are other people on the island. Claire wakes up screaming two nights in a row and insists that someone held her down and stabbed her stomach. This attack persuades Hurley to take a census of the survivors using the flight manifest, and he discovers that Ethan was not on the plane. In flashbacks, Claire finds out she is pregnant and her boyfriend leaves her. She goes to see a psychic, who says that great danger surrounds her baby.


episode 111 - Episode Title | Watch
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After Claire and Charlie are kidnapped by Ethan, two parties of Jack and Kate, and Locke and Boone go looking for them. Jack encounters Ethan, who warns that one of the hostages will be killed. Jack and Kate find Charlie, blindfolded and hanging by his neck from a tree branch. Jack furiously performs CPR and Charlie comes back to life. Meanwhile, Boone and Locke discover a piece of metal embedded in the forest's ground. In flashbacks, Jack confesses to his superiors that his father had been under the influence of alcohol while operating.


episode 112 - Episode Title | Watch
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While swimming, Kate finds the marshal's locked case. Jack agrees to help Kate open the case if she will show him what is inside it. There are guns inside and a toy airplane. Kate says the airplane belonged to the man she loved—and killed. In a flashback, Kate robs a bank so that she can recover the toy airplane.


episode 113 - Episode Title | Watch
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Shannon's relationship with Sayid gets more personal. Locke and Boone try to get into the hatch they found. Boone wants to tell Shannon about the hatch and Locke gives him a drug that causes him to hallucinate and let go of Shannon. In flashbacks, Boone tries to get rid of Shannon's abusive boyfriend by paying him off, only to find out that it was all a scam perpetrated by Shannon, who proceeds to sleep with Boone.


episode 114 - Episode Title | Watch
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An annoyed Michael confronts Walt, who has been studying knife skills under Locke, and enlists his help in scavenging parts from the wreck to build a raft, but Walt wanders off. Michael and Locke track Walt into the jungle and find that he has been trapped by a polar bear. Michael risks his life to save Walt and they reconcile. Later, Locke and Boone find Claire stumbling out of the jungle. Flashbacks show that when Walt was only a few months old, his mother accepted a job in Amsterdam and took her child with her. She married a co-worker named Brian when Walt was two and refuses to let Michael speak to Walt. Years later, Susan dies and Brian does not want custody of Walt because the boy is "different".


episode 115 - Episode Title | Watch
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Claire is back among the survivors, but the last thing she remembers is the flight. Ethan confronts Charlie, threatening to kill the other castaways one by one until he gets Claire back. Despite security measures, Scott is murdered. With the guns from the briefcase and Claire as bait, Jack, Kate, Locke, Sayid and Sawyer set a trap. The trap works, and Ethan is captured. Although the plan is to keep Ethan alive, a vengeful Charlie kills him. In flashbacks, Charlie tries to get drug money by stealing from a rich girl.


episode 116 - Episode Title | Watch
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In dream or flashback, a small child (presumably Sawyer) is being talked to by his mother, who instructs him to hide under the bed and never come out no matter what. There is a man banging on the door and eventually breaks it down. The door closes, and the child's mother is heard yelling, "What the hell is wrong with you?!" in a worried, angered manner. Shots are heard and the fighting stops. The man comes into the child's room, sits on top of the bed the child is hiding under, and kills himself. Sawyer is awakened by a boar in his tent. Sawyer becomes obsessed with finding the boar that raided his tent and goes into the jungle with Kate to find it; however, he does not kill it when he finds it. He gives his gun to Jack, who now has all the firearms in the marshal's suitcase. Sawyer realizes that he met Jack's father in Australia. In flashbacks, Sawyer tracks down who he believes to be the Sawyer who ruined his life, in Australia. Sawyer kills the man, but finds out that that man was not the original Sawyer.


episode 117 - Episode Title | Watch
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Michael continues work on his raft, which only has one available spot left as Sawyer has bought a seat on the raft in exchange for building materials. The raft is set on fire and everyone blames Jin. Michael beats up Jin the next morning. Sun then tells him to stop because Jin did not burn the raft. Everyone is surprised that she speaks English, including Jin. Locke says that it was probably the Others. Michael concedes the raft is gone and decides to make a new one. Sun goes to see Jin, who tells her that it is too late to start over. Jin goes back to the beach and helps Michael rebuild the raft, on which he has gained a spot. Walt confesses to Locke that he burned the raft because he likes the island. In flashbacks, it is revealed that the reason Jin once showed up covered in blood was because he beat a man to save him from the death sentence that Sun's father had ordered. Jin plans to go to America with Sun to start a new life.


episode 118 - Episode Title | Watch
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Hurley finds that some of Rousseau's documents contain the repeated numbers 4, 8, 15, 16, 23 and 42, the same numbers which Hurley had used to win a lottery jackpot. Hurley sets off on his own and finds Rousseau, who says that she does not know what the numbers mean: only that her party was drawn to the island by a radio transmission that was broadcasting the numbers. The numbers are revealed to be engraved on the side of the hatch. In flashbacks, Hurley wins the lottery, and over the coming weeks, everyone around him suffers increasingly bad luck.


episode 119 - Episode Title | Watch
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Locke discovers that he is losing sensation in his legs. Locke and Boone find a Beechcraft 18 teetering on the edge of a cliff. Boone climbs up and, using the radio, sends out a distress call, "We are the survivors of Oceanic Flight 815," to which a man responds "We're the survivors of Oceanic Flight 815. The plane falls and Locke carries a critically injured Boone back to the camp. Locke arrives at the caves with Boone and lies about how Boone got hurt. Locke disappears into the jungle. Pounding on the hatch and screaming in anguish, the inside of the hatch suddenly becomes illuminated. In flashbacks, Locke meets his parents and his father cons him out of a kidney.


episode 120 - Episode Title | Watch
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Boone reveals to Jack that he and Locke have discovered the hatch, and Locke has told him not to tell anybody else. Despite Jack's extensive attempts to save him, Boone dies. Claire goes into labor and gives birth to a boy. Flashbacks show Jack's wedding to Sarah, a former patient whom he had "fixed" after she was injured in a car accident.


episode 121 - Episode Title | Watch
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Locke arrives at Boone's funeral and is attacked by Jack. Locke asks for Shannon's forgiveness, to no avail; instead, Shannon steals the key to the gun case from a sleeping Jack, and confronts Locke in the jungle. Sayid tackles Shannon just as she fires the gun and the bullet grazes Locke's head. Sayid later tells Locke to take him to the hatch. In flashbacks, Sayid becomes an informant for the Australian Secret Intelligence Service and the CIA, which has asked him to infiltrate a terrorist cell of which his old friend Essam is a member. Sayid agrees to do it in return for Nadia's whereabouts and he betrays Essam, who kills himself.


episode 122 - Episode Title | Watch
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Sayid and Locke show the hatch to Jack, who believes that the hatch needs to be opened. Walt warns Locke not to open the hatch, despite not ever being told about it. Kate seeks a place on the raft, threatening to take Sawyer's spot. After Michael is poisoned, he kicks Sawyer off the raft. Sawyer reveals to everyone that Kate was the fugitive on the plane. Walt confesses to Michael that he was responsible for the fire that destroyed the first raft and, although Michael says they can stay on the island, Walt insists that they have to leave. Jack discovers from Sun that the poison was intended for Jin. In flashbacks, Kate returns to her home town to see her dying mother, and meets up with former boyfriend Tom Brennan. With Tom's help, Kate is able to be alone with her mother, who begins screaming for help upon seeing her. She and Tom try to escape, but Tom is killed and Kate runs.


episode 123 - Episode Title | Watch
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Rousseau arrives at the beach to warn the survivors that the Others are coming, and tells them more of her own story. She was pregnant when she came to the island sixteen years ago but the Others—their arrival heralded by a column of black smoke—came and kidnapped her baby, who she has not seen since. A column of black smoke is soon seen in the distance. Jack, Locke and Sayid tell Rousseau about the hatch, and their need to open it, perhaps with dynamite. Rousseau offers to take them to the Black Rock to get some dynamite. Jack, Locke, Kate, Hurley, Arzt and Rousseau arrive at the Black Rock, a large slave ship stranded inland. Meanwhile, Charlie gathers messages to put in a bottle and the raft sets sail. In flashbacks, several of the survivors are shown in the final hours before the flight.


episode 124 - Episode Title | Watch
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Rousseau leaves the Black Rock, and Arzt explodes while handling the dynamite. They encounter the monster—a cloud of black smoke. Rousseau steals Claire's baby, whom she has named Aaron. Sayid surmises that Rousseau intends to attempt an exchange of Claire's baby, for her own child with the Others. Charlie and Sayid head toward the column of black smoke and along the way, they also encounter the drug smugglers' plane, which Sayid reveals is full of heroin; Charlie takes some. When Sayid and Charlie arrive on the beach with the black smoke, there are no other people, just a pyre and Rousseau and Aaron. She returns Aaron and tells them that she overheard the Others saying that they were going after "the boy". On the raft, the crew encounters a boat. The boat's crew turns out unfriendly and demands that they hand over Walt. Sawyer is shot and Walt is taken. An explosive is thrown onto the raft, destroying it. Meanwhile, Jack, Kate, Locke, and Hurley blow open the hatch, revealing a very deep dark hole with a broken ladder. The survivors' time in the airport and boarding the plane continues to be shown through flashbacks.