Plot summary
Sayid promises to retrieve Charlotte peacefully if he gets a spot on the helicopter, taking Kate and Miles with him. Unable to find the cabin, Locke leads his group to the Barracks, where he gets the drop on Sayid's group. Kate defects to Locke's side, knowing she would be arrested for her crimes upon returning to the mainland, and Sayid trades Miles for Charlotte. Daniel calls the Kahana and it shoots a projectile onto the island, and he determines that time on the island is out of sync with time on the boat. In the future, Sayid works as a hitman and seduces a woman to get closer to her boss, "the economist." She turns out to also be an assassin, forcing him to kill her. Sayid returns to his handler, Ben, who asserts that he is killing people to keep his returned friends, the "Oceanic Six", safe.
Credits
Adapted from Wikipedia contributors, Lost season 4. HTML formatting and reference markers removed.