In 1977, the survivors back at the island try to detonate and arm the bomb and destroy the island. They succeed in detonating the modified nuclear bomb at the construction site of the Swan station, the finale ending when the bomb is detonated.

Fast forward to the year 2007, Locke, together with the Others, manage to get to the base of the infamous four-toed statue, where they know Jacob lives. However, in a twist of events, Locke is revealed to be an impostor: an old acquaintance of Jacob who tricks Ben into killing Jacob. In flashbacks, Jacob visits several of the main characters.