This episode shines a light on Charlie, Drive Shaft and how he became addicted to drugs. This is also the episode that sees Jack trapped in a cave-in as well as the mysterious person to knock Sayid on the head as he was about to triangulate the source of the distress signal. Although this was a good episode, it felt a little underwhelming compared to all the episodes thus far. Maybe the lack of John Locke had something to do with it. I dunno.