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48 survivors of an airline flight originating from Australia, bound for the U.S., crash-lands onto an unknown island 1000 miles off course, struggle to figure out a way to survive.
Trucky, Roady and Voom Vam want to go to the lake to have a picnic. After wandering around for quite some time, they realize they have no clue how to get to the lake.
Hunt for the truth about the 1980s arcade game that's been linked to MK-Ultra, and join the search for a lost nuclear bomb. Plus, is Lake Michigan the final resting place for millions of dollars in stolen Confederate gold?
The castaways' spirits are raised with the discovery of a transceiver in the wreckage; the group discovers handcuffs, a gun and an animal that shouldn't be able to survive in a tropical climate.
Jack and Hurley learn an alarming secret about Kate, as the marshal's life hangs in the balance; Kate, Charlie, Sawyer, Sayid, Boone and Shannon ponder mysteries they discovered.
Zahi uncovers a cache of mummies at a dig site at Saqqara and discovers a rare and important piece of Egyptian history: a beautiful anthropoid sarcophagus from the 26th Dynasty!
While on a hunt for food, a secret about the mysterious Locke is revealed, and Jack's plan about what to do with the bodies shocks some of the castaways.
Jack's lack of sleep brings him to the edge of delirium, Boone gets trapped in a dangerous riptide, and Claire's health takes a turn for the worse.
Walt and the others are shocked when Michael is brutally beaten, but only Jin and Sun know the truth about the attack; Kate, Jack, Sawyer and Sayid argue about where the survivors should set up their camp.
Charlie begins a painful withdrawal from drugs, assisted by Locke; Jack is buried in a cave collapse and the other survivors struggle to find and free him.
Shannon suffers an asthma attack. Jack and Sayid resort to brutality to convince Sawyer to share the life-saving medicine he's hoarding; Sun struggles to decide whether to follow her husband's directive
Sayid's life is in danger after he discovers the source of the mysterious French transmission; Hurley concocts a funny plan to bring civility to the island.
Jack, Kate and Charlie begin to wonder if Claire's nightmares are coming true, threatening not only her life but also the life of her unborn child.
Claire and Charlie go missing, sending a ripple of panic among the other survivors. Jack, Kate, Locke and Boone quickly scramble off in search of the pair, following their footprints in the sand.
Kate and Sawyer get more than they bargained for when they stumble across a beautiful waterfall in a previously unexplored part of the jungle. They dive into the water but discover two bodies.
Boone and Locke head back into the jungle to investigate about the hatch. Boone is keen to tell Shannon about it, but Locke takes measures to prevent him from returning to camp with the news.
Michael must prove his devotion as a father when Walt goes missing after being forbidden from spending any time with Locke. Meanwhile Charlie searches for Claire's diary in the hope of finding a clue.
The joy at Claire's safe return is short-lived when Ethan pounces on Charlie, threatening to kill off the survivors unless she's returned to him. The camp set up an alarm system and sentry duty.
Kate and Sawyer bond as they search for a wild boar that Sawyer swears is harassing him; Hurley and Sayid worry that Charlie is losing it after his brush with death.
When the raft the survivors had been building mysteriously burns down, Michael is convinced that Jin is responsible for the sabotage, which only serves to escalate their rivalry.
Hurley becomes obsessed with finding the Frenchwoman and heads off into the jungle to find her, leaving Jack, Sayid and Charlie no choice but to follow him.
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.
Boone fights for his life, while Jack frantically searches for a survivor who shares Boone's blood type. Elsewhere, Kate stumbles upon Claire, alone and clearly in labour, but can't find anyone to help.
Devastated by the loss of her brother, Shannon vows to get revenge on Locke, who she believes is responsible for his death. Jack succumbs to stress and exhaustion and is forced to take some rest.
Michael makes the final preparations to launch the raft but is struck down by a mystery illness that delays the group's departure, Jack suspects that Michael was poisoned.
A chill is sent through the camp this week when Rousseau appears carrying a rifle, claiming that The Others' are coming. The group redouble their efforts to get the raft ready for launch.
With the departure of the raft, the castaways are left to return to the problem at hand. The column of black smoke continues to billow from deep in the jungle and they need to get to safety.
Something unexpected at sea surprises those on the raft; the remaining islanders try to blow open the hatch; a visitor to the encampment could be a threat to Claire's infant son.