Sawyer's wound becomes life-threatening as he, Michael and Jin make their way through the interior of the island with the tail section survivors. Meanwhile, Shannon is once again haunted by visions of Walt. Also, Shannon's shocking past of her former marriage as well as her manipulation of people prior to the crash are revealed. Plus, there is the revelation on the death of Shannon's father who ended up in the hospital where Jack worked. Lastly, Charlie becomes jealous of Locke's interest in Claire.

A Shannon-centric episode.