Jack, Kate and Sawyer begin to discover what they are up against as prisoners of The Others. A Jack-centric episode.

Sayid's plan to locate Jack places Sun and Jin's lives in grave danger. Meanwhile, Kate and Sawyer are forced to work in harsh conditions by their captors, and Henry makes a very tempting offer to Jack that may prove difficult to refuse. A Jin/Sun-centric episode.

The fates of Locke, Eko and Desmond are revealed after the implosion of the hatch, while Hurley returns to the beach camp to tell the tale of what happened when he, Jack, Kate and Sawyer encountered The Others. Meanwhile, Claire is shocked to find Nikki and Paulo in Jack's tent. A Locke-centric episode.

Sawyer learns just how far the Others will go to keep he and Kate from escaping their captors and returning to the South Beach. Meanwhile, Jack is pressed into service to save the life of an Other, and questions arise in the South as Desmond begins building a mysterious device. A Sawyer-centric episode.

As Eko recovers from his injuries, several of the other survivors head toward the Pearl Station in order to find a computer they can use to locate Jack, Kate and Sawyer. Meanwhile, when two of the Others take sides against each other, Jack must decide which of them to trust. An Eko-centric episode.

Kate feels helpless when it looks like Pickett is going to make good on his threat to kill Sawyer, Locke uncovers a piece of information that will change everything he knows about the island, and Jack makes a decision regarding Ben's offer. A Kate-centric episode.

This episode continues exactly where the last one finished. Ben, 's life is now in Jack's hands. Jack wastes no time using this to his advantage by helping Kate and Sawyer to escape. What perils lie ahead for Kate and Sawyer? Could they find unexpected help from one of the Others? We also get the opportunity to learn more about Juliet and her past. Charlie and Hurley go through Sawyer's personal belongings and food stash back at the beach and Charlie finds himself under attack by Desmond. A Juliet-centric episode.

A suspicious and determined Hurley enlists Charlie to help him wrangle the truth out of Desmond, who has been acting strangely ever since the implosion of the hatch. A Desmond-centric episode.

A power play ensues between Jack and The Others as Juliet's future hangs in the balance. Meanwhile, Kate, Sawyer and Karl continue on their journey away from Alcatraz. A Jack-centric episode.

Hurley's discovery of an old, wrecked car on the island leads him on a mission of hope not only for himself, but for a fellow survivor in need of some faith. Meanwhile, Kate and Sawyer reunite with their fellow castaways, but Kate is still torn about leaving Jack behind with The Others. A Hurley-centric episode.

Locke, Sayid and Kate investigate a strange structure and its mysterious inhabitant. Meanwhile, Sawyer competes in a ping-pong competition to get back his belongings. A Sayid-centric episode.

Claire becomes suspicious of Charlie when he exhibits peculiar behavior after she comes up with an idea that could get everybody rescued. Meanwhile, tensions mount between Sayid and Locke as they continue their trek to rescue Jack. A Claire-centric episode.

Ben tries to persuade a determined Locke to call off his destructive plan by offering him some of the secrets of the island, and Kate's reunion with Jack does not go off as planned when she discovers that he has made a deal with The Others. A Locke-centric episode.

Hurley begins to suspect that Sawyer may be involved in an island mystery surrounding two fellow survivors, and Sun learns the truth about her past kidnapping attempt by The Others. A Nikki-Paulo-centric episode.

After discovering that one of her own has betrayed her to The Others, Kate is left to fend for herself in the jungle with Juliet. Meanwhile, Hurley warns Sawyer to change his selfish ways and make amends with his fellow survivors or he may face a vote of banishment. A Kate-centric episode.

Jack's joyous reunion with his fellow survivors is cut short when they realize that accompanying him is one of The Others, and Claire is stricken by a mysterious, life-threatening illness. A Juliet-centric episode.

Desmond coaxes Charlie, Hurley and Jin on a trek across the jungle after experiencing one of his future-prophesizing flashes -- but is he purposely placing Charlie's life in harm's way? Meanwhile, Kate turns to an unwitting Sawyer after seeing Jack alone with Juliet. A Desmond-centric episode.

After discovering that all of The Others' pregnant women died before giving birth on the island, an extremely reticent Sun allows Juliet to examine her -- and uncovers the identity of the unborn child's father. Meanwhile, Desmond allows an unlikely nemesis to help save the life of a new, mysterious island inhabitant. A Jin/Sun-centric episode.

A newly focused Locke breaks away from The Others in an attempt to persuade Sawyer to help rid them of a great nemesis that has caused nothing but pain in both of their lives. Meanwhile, a new island inhabitant discloses some shocking information about Oceanic Flight 815. A Locke-centric episode.

Ben begrudgingly begins to introduce Locke to the secrets of the island, beginning with the mysterious Jacob. Meanwhile, Juliet's secret goes public. A Ben-centric episode.

While Jack devises a plan to do away with The Others once and for all, Sayid uncovers a flaw in The Others' system that could lead to everyone's rescue. But it requires Charlie to take on a dangerous task that may make Desmond's premonition come true. A Charlie-centric episode.

Jack and the castaways begin their efforts to make contact with Naomi's rescue ship. A Jack-centric episode.

Jack and the castaways begin their efforts to make contact with Naomi's rescue ship. A Jack-centric episode.