Spoilers for this episode and earlier episodes of Lost.
Ben wakes to find Locke alive and says he has returned to face judgment from the smoke monster. He manipulates Caesar's suspicion of Locke, then shoots Caesar when the man tries to stop their departure. On the main island, Ben and Locke find Sun and Frank at the barracks. Frank leaves for the plane, while Sun stays because Locke promises to help locate Jin. Ben's attempt to summon the monster from his old house produces no response.
Flashbacks show Ben taking baby Alex from Danielle after being sent to kill her. He refuses Widmore's demand that the child be killed too. Later, Ben sees Widmore banished from the island. Another mainland sequence explains Ben's injuries before the Ajira flight: he approaches Penny's boat intending revenge against Widmore, shoots Desmond and threatens Penny. The sight of her son interrupts him, allowing Desmond to attack and throw him into the water.
Locke leads Ben beneath the Temple wall, where Ben admits responsibility for the choice that led to Alex's death. The floor gives way and drops him into a chamber. Smoke surrounds him and displays moments from his past with Alex. After it withdraws, a figure appearing as Alex confronts him, threatening him if he tries to kill Locke again and ordering him to obey Locke. Ben survives and agrees. Back on the Hydra island, Ilana knocks Frank unconscious after he cannot answer her question about the shadow of the statue.