Locke, Kate, Jack and Hurley continue their quest to blow open the mysterious hatch with the dynamite they collected from the Black Rock, whilst Claire has Sayid and Charlie hunting Danielle to get her baby boy back after he was snatched. Out at sea, Michael, Jin, Walt and Sawyer pick up an object on their radar and decide to fire the flare gun to attract their attention... but it comes at a price.

Originally aired as the second of a two-part episode for the finale of series one.