After discovering something odd just offshore, Jack and Sayid come up with a plan to confront "The Others."

Mr. Eko enlists Locke to help find a secret location he believes houses answers to the island's mysteries.

Rose is surprisingly and vehemently opposed to Bernard's plan to create an S.O.S. signal.

When the hatch suddenly takes on a life of its own, Locke is forced to enlist the help of an unlikely ally.

Claire, along with Kate and Rousseau, attempts a return to the scene of her kidnapping to find a cure for her sick baby.

Survivors fear that "The Others" may have returned when Sun is injured during a failed kidnapping attempt.

Kate's original crime that started her life on the run is revealed. Meanwhile, the survivors lay one of their own to rest.

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

Michael sets off into the jungle by himself determined to find Walt, but discovers that he is not alone.

Jack, Locke and Kate learn more secrets about the hatch. Meanwhile, Sawyer, Michael and Jin wonder if their captors are fellow survivors or the dreaded "Others."

A castaway is chosen to descend into the mysterious hatch, and Shannon stumbles upon a shockingly familiar face.