Plot summary
Ben is a history teacher and struggles to get funding for his school club when Locke suggests he take over as principal. He collects evidence of the principal's infidelity and tries to blackmail him, but backs down when he threatens the college career of Alex Rousseau, his favorite student. Ben bargains to secure funding for the club. On the island, Ilana has Miles use his ability on Jacob's ashes and learns that Ben killed him. Furious, she forces Ben to dig his own grave, but the Man in Black tempts him with leadership of the island and directs him on how to escape and kill her.
He instead tells her that he killed Jacob because he was never chosen, and how he sacrificed Alex for him. Jack meets a disillusioned Richard and insists that the island needs them both to live, proving this when they try to kill themselves with dynamite and the fuse goes out. The survivors reunite on the beach and Ben is allowed to stay with them, while a submarine owned by Charles Widmore watches from the water.
Credits
Adapted from Wikipedia contributors, Lost season 6. HTML formatting and reference markers removed.