What They Died For
"What They Died For" is the 16th and penultimate episode of the American serial drama series Lost, and 119th and penultimate episode overall. The episode aired on May 18, 2010, on ABC in the United States. The episode's flash-sideways are centered on Jack Shephard, Desmond Hume, Benjamin Linus and James "Sawyer" Ford.
In the flash-sideways timeline, Desmond Hume continues his attempt to gather all the passengers of Oceanic Airlines Flight 815. In 2007, The Man in Black devises a new strategy. Jack Shephard takes the role as leader of the island while he and his group search for Desmond.
Plot
2004 (flash-sideways timeline)
Jack Shephard, Claire Littleton, and David Shephard eat breakfast and discuss David's participation in a concert that night. Jack is notified that Oceanic Airlines have found Christian Shephard's coffin; unbeknownst to him, this is a ruse planned by Desmond Hume.Outside the school where he and John Locke work, Ben Linus sees and confronts Desmond, who beats him while explaining that his intent was to make Locke "let go". Ben experiences flashes of Desmond beating him in the original universe. Ben relates all this to Locke, who goes to see Jack at the hospital and decides to have the new procedure; he believes his experiences with Desmond and Jack have been fated.
Alex's mother, Danielle Rousseau, offers the visibly injured Ben a ride home. She invites him to dinner, where Rousseau tells Ben that he has become like a father to Alex since her real father's death.
Desmond enters James "Sawyer" Ford and Miles Straume's police station, confesses to assaulting Locke and Ben, and is jailed alongside Kate Austen and Sayid Jarrah. The three prisoners are to be transported by van, but the driver, Ana Lucia Cortez, releases them and receives a payoff from Desmond and Hugo "Hurley" Reyes. Desmond hands Kate a dress and tells her they are going to a concert.
2007 (original timeline)
After the submarine explosion, Jack, Kate, Hurley, and Sawyer wash ashore, alive. Jack determines they must find Desmond, whose importance is revealed by the Man in Black's attempt to kill him. A younger Jacob confronts Hurley, demanding his body's ashes. Hurley gives them to him, and Jacob leaves without answering any of Hurley's questions. Hurley chases him to a campfire, where the adult Jacob instructs him to bring the others before the campfire burns out, which will end his ability to manifest as he poured his ashes into the fire. They arrive in time, and are all able to see Jacob for the first time. He explains that they were chosen to come to the island because each of them has an emptiness that can be filled by the island, and that one of them must choose to be the guardian who will protect the light, the "heart" of the island, from the Man in Black. Jack volunteers; Jacob gives Jack a drink of water and declares that Jack is "now like ".Ben, Miles, and Richard Alpert reach the destroyed Barracks of the DHARMA Initiative. Ben enters the secret room where he was previously seen summoning the smoke monster to retrieve a stack of C4 he hid there. He plans to use it to destroy the Ajira airplane and prevent the Man in Black's escape. Charles Widmore and Zoe confront Ben, and Charles claims to be the group's only hope. Zoe and Widmore hide when the Man in Black arrives, while Miles flees. The smoke monster, the Man in Black, attacks Richard. As Locke, he demands Widmore's location from Ben, who reveals it. The Man in Black kills Zoe when it becomes clear she will not talk, then threatens to harm Penny unless Widmore reveals his purpose on the island. Widmore whispers a response, but Ben shoots and kills him to deny him the opportunity to save his daughter. The Man in Black claims to have already gotten the information he wanted, and leaves with Ben.
The two later find that Desmond has apparently escaped the well by climbing a rope. However, the Man in Black says this will not prevent him from using what he learned from Widmore: he can use Desmond's resistance to electromagnetism to destroy the island.