Kate, Locke, Sayid, and Rousseau are on a mission to go find Jack. Along the way, they have a lot to deal with, including Kate's over-eagerness, Locke's refusal to engage with logic, and a semi-immortal member of the Others. Meanwhile, back on the beach, Hurley manages to teach Sawyer a lesson in ping pong. Trust us, it's more interesting than it sounds. All this and more on this week's show!