New Kids on the Block

Sayid and Locke show the hatch to Jack, who believes that the hatch needs to be opened. Walt warns Locke not to open the hatch, despite not ever being told about it. Kate seeks a place on the raft, threatening to take Sawyer's spot. After Michael is poisoned, he kicks Sawyer off the raft. Sawyer reveals to everyone that Kate was the fugitive on the plane. Walt confesses to Michael that he was responsible for the fire that destroyed the first raft and, although Michael says they can stay on the island, Walt insists that they have to leave. Jack discovers from Sun that the poison was intended for Jin. In flashbacks, Kate returns to her home town to see her dying mother, and meets up with former boyfriend Tom Brennan. With Tom's help, Kate is able to be alone with her mother, who begins screaming for help upon seeing her. She and Tom try to escape, but Tom is killed and Kate runs.

GA music producer selects Bart, Nelson, Milhouse and Ralph to be members of the next hit boy band, who record subliminal songs about joining the Navy.

In 1977, the survivors succeed in detonating the modified nuclear bomb at the construction site of the Swan station, the finale ending when the bomb is detonated. In 2007, Locke and the Others travel to the base of the four-toed statue, where Jacob lives. Locke is revealed to be an impostor: an old acquaintance of Jacob who manipulates Ben into killing Jacob. In flashbacks, Jacob visits several of the main characters at key moments in their lives prior to crashing on the island.