Lost

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.

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 discover an alarming secret about Kate, as the marshall's life hangs in the balance. Meanwhile Kate, Charlie, Sawyer, Sayid, Boone and Shannon ponder the island's mysteries they've uncovered and worry that telling the other survivors will cause a panic.

A shocking secret is revealed when Kate and Michael join the mysterious Locke on a hunt for food. Meanwhile, some survivors are horrified by Jack's plan for the dead bodies amongst the wreckage, and Jack sees someone in the jungle who might not have been on the plane.

Jack is near delirious from lack of sleep and struggles to overcome the haunting events that brought him to Australia and, subsequently, to the island. Meanwhile, Boone gets caught in a treacherous riptide, and a thief may have stolen the last bottles of water.

Walt and the others are shocked when Michael is brutally beaten, but only the non-English speaking Jin and Sun know the truth behind the attack. Meanwhile Kate, Jack, Sawyer and Sayid argue about where the survivors should camp, and Locke discovers Charlie's secret.

Charlie begins a painful journey of withdrawal from drugs, surprisingly aided by Locke, whose true motive for helping remains a mystery. Meanwhile, survivors struggle to find and free Jack when he's buried alive in a cave collapse.

When Shannon suffers an asthma attack, Jack and Sayid realise brutality might be the only way to convince Sawyer to relinquish the medicine he's hoarding. Meanwhile, Sun struggles to decide if she'll obey Jin's orders, and Kate uncovers shocking secrets about Sawyer.

Sayid's life is placed in grave danger after he stumbles upon the source of the mysterious French transmission. Meanwhile, Hurley has a seemingly ridiculous plan to make life on the island a little more civilized….and it might just work.

Jack, Kate and Charlie wonder if Claire's disturbing nightmares might be coming true, and with them a very real threat to her life and that of her unborn child. Meanwhile, a missing castaway returns with frightening news about what lies just beyond the mountains.

A search party ventures into the treacherous jungle attempting to find and rescue Charlie and Claire, who appear to have been abducted. Meanwhile, inner-demons about his father resurface for Jack, whilst Boone and Locke discover another island mystery.

Jack, Kate and Sawyer fight over possession of a newly discovered locked metal briefcase which might contain insights into Kate's mysterious past. Meanwhile, Sayid asks a reluctant Shannon to translate notes he took from the French woman.

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.

Claire goes into labour…..leading to a helpless Charlie going into panic mode. Meanwhile, Locke has gone missing, Jack tends to a wounded survivor, and Sayid presents Shannon with a romantic surprise.

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.

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 some of the survivors, and Walt gives Locke a warning.

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.

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

With the abduction of Walt fresh on their minds and their raft destroyed, Michael, Sawyer and Jin fight for their lives and discover a new predator in the rolling ocean. Meanwhile on land, Locke must descend into the hatch when one survivor goes missing inside.

Jack, Locke and Kate uncover 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".

Disturbing memories from Hurley's past cause him to struggle with a task he's assigned inside the hatch. Meanwhile Sawyer, Michael and Jin discover the identities of their captors, and Claire uncovers a shocking piece of information about the fate of the raft.

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 to take them to their camp, and Sun frantically searches for her missing wedding ring.

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. Meanwhile, Shannon is once again haunted by visions of Walt, and Charlie becomes jealous of Locke's interest in Claire.

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

Violence erupts as Ana Lucia's group encounters the other castaways, leading to leadership challenges and a looming confrontation.

The original crime that started Kate's 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.

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

Jack, Locke and Sawyer pursue Michael after he heads into the jungle in search of Walt, with "The Others" nearby. Meanwhile, Sun has a surprising reaction to Jin wanting to join the search party, and Hurley and Charlie contemplate the old chesnut of "what women want".

Charlie's strange dreams raise concerns about the baby's safety, while Locke suspects drug use. Sawyer encourages Hurley's feelings for Libby.

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.

When Rousseau leads Sayid to a mysterious captive in the jungle, he becomes determined to find out if he is one of "The Others". Meanwhile, Sawyer discovers Hurley's potentially devastating breech of the survivors' trust and sees it as an opportunity for blackmail.

A desperate Claire, along with Kate and Rousseau, attempts a return to the scene of her kidnapping where she believes she might find the cure for Baby Aaron's mysterious illness. Meanwhile, Jack and Locke must keep their prisoner a secret from the rest of the survivors.

Sun wrestles with the thought of telling Jin a newfound secret that threatens to upset the entire balance of the survivors' community. Meanwhile, Locke enlists Ana Lucia to interrogate the prisoner in order to extract more information than he, Jack or Sayid could.

When the hatch suddenly takes on a life of its own, Locke is forced to enlist the help of an unlikely ally. Meanwhile, Ana Lucia, Sayid and Charlie go off into the jungle to find out the truth about the mysterious Henry Gale.

Libby lends Hurley support when he begins to think the island is having a strange effect on him, and Locke's sense of purpose is shaken when the prisoner provides new information about the hatch.

Rose is surprisingly and vehemently opposed to Bernard's plan to create an SOS signal. Meanwhile, romantic is rekindled between Jack and Kate when they trek into the jungle to propose a trade with "The Others", and Locke begins to question his faith in the island.

Jack and Kate bring an exhausted Michael back to the camp, and with him, news about "The Others". Meanwhile, Ana Lucia attempts to get the prisoner to confess, and Hurley plans a surprise date for Libby.

Mr Eko enlists Locke to help find a secret location he believes houses answers to the island's mysteries. Meanwhile, Jack and the other survivors struggle to cope with the horrific situation in the hatch.

A determined Michael convinces Jack and several castaways to help him rescue Walt from "The Others". Meanwhile, Charlie struggles with Eko's decision to discontinue building the church.

Jack and Sayid devise a plan to confront 'The Others' and rescue Walt, unraveling the mystery of Michael's whereabouts in the process.

In the jungle, Jack exposes Michael, leading to a confession of his actions. Hurley discovers Michael killed the woman he loved, but Jack has another revelation to share.