Locke and Ben finally meet face-to-face with Jacob, while Jack receives unexpected help in his attempt to change history.

Jacob is revealed as Locke tries to manipulate Ben, while Sawyer, Kate, and Juliet try to stop Jack from detonating the bomb.

Locke finally takes up his mantle as leader of the Others, and in doing so reveals a startling plan. In 1977, the survivors try to escape from the Dharma Initiative, but Jack becomes convinced that changing history is what they were brought back here to do.

Daniel returns to the island with an urgent, daring plan to get all of the castaways back to where they belong — a plan that divides the survivors.

Miles gets caught in the middle of Dharma Initiative secrets, which bring him face to face with demons from his own past.

Ben sets off with Locke to fulfill the reason he came back to the island, but along the way he learns just how much Locke has changed.

Kate goes to great lengths to save young Ben’s life, while Jack infuriates everyone by refusing to do anything to help.

Sayid’s life is on the line as the Dharma Initiative goes to great lengths to get the truth out of him.

Sawyer must act fast to bring Jack, Kate, and Hurley into the Dharma Initiative. In the present, the fate of Ajira 316 is revealed.

After their final time flash strands them in the ’70s, Sawyer takes charge and leads his friends into joining up with the Dharma Initiative.