Tv guide summary for epi 6x16

Lost
Last week, we were told that Locke's motives would become clear. Locke, it turns out, was on the show for only a few seconds, but we do now know why Jacob and the Man in Black have been at loggerheads for, what, 2000 years? And don't the Man in Black and the Locke Monster share a certain smoky characteristic? So there. As for the Locke Monster, he makes a strategic move in the series' penultimate episode, while the island's Jack faction searches for Desmond. And old friends Ana Lucia, Rousseau and Alex turn up. The episode's title is "What They Died For." What who died for?

source : tv guide