A mysterious illness that baby Aaron suddenly contracts sends a desperate Claire, Kate and French woman Danielle to return to the same area where Claire was initially kidnapped. It is there where she believes she can find a cure for Aaron's illness. In the meantime, Jack and Locke are doing their best to keep their prisoner a secret from the rest of the survivors on the island.
Season: 2
One of Them
After Sun is attacked, some of the survivors begin to think that one of the "other survivors" might be one of "The Others." When French woman Danielle 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 breach of the survivors’ trust and blackmails him into helping track an elusive island creature that won’t leave Sawyer alone.
Live Together, Die Alone (2)
After discovering something odd just offshore, Jack and Sayid come up with a plan to confront "The Others" and hopefully get Walt back. Meanwhile, Eko and Locke come to blows as Locke makes a potentially cataclysmic decision regarding the "button" and the hatch.
The Ghost of Harrenhal
The Baratheon rivalry ends, driving Catelyn to flee and Littlefinger to act. At King’s Landing, Tyrion’s source alerts him to Joffrey’s defense plan – and a mysterious secret weapon. Theon sails to the Stony Shore to prove he’s worthy to be called Ironborn. At Harrenhal, Arya receives a promise from Jaqen H’ghar, one of the prisoners she saved from the Gold Cloaks. The Night’s Watch arrive at the Fist of the First Men, an ancient ringfort where they hope to stem the wildings' advance.