Season 2 conclusion (Part 1 of two). Jack and Sayid devise a plan to confront the Others and rescue Walt after a boat appears offshore. Meanwhile, Eko and Locke fight as Locke makes a potentially cataclysmic decision regarding the "button" and the hatch. Flashbacks follow Desmond (Henry Ian Cusick) and explore the hatch's history from his point of view. ~ Paul Droesch, All Movie Guide