Jack and his fellow castaways begin their efforts to make contact with Naomi's rescue ship.

Ben begrudgingly begins to introduce Locke to the secrets of the island, beginning with the mysterious Jacob.

Sun discovers the identity of her unborn child's father. Meanwhile, Desmond allows an unlikely foe to help save the life of a mysterious new island inhabitant.

Jack's joyous reunion with his fellow survivors is cut short when they realize that accompanying him is one of "The Others."

Hurley is suspicious of Sawyer's involvement in an island mystery.

Claire becomes suspicious of Charlie's peculiar behavior, while tensions mount between Sayid and Locke.

Hurley discovers a wrecked car on the island and uses it on a mission of hope.

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.

Jack makes a decision about Ben's offer, and Kate fears that Pickett may make good on his threat to kill Sawyer.

Sawyer finds out how serious his captors are in making sure he and Kate don't attempt to escape.

Sayid places Sun and Jin's lives in danger while trying to locate Jack, while Jack gets a tempting offer from his captors.