Jack tends to a severely wounded Boone after Locke returns him to the caves. Sun gives Jack some much-needed medical assistance and Sayid presents Shannon with a grand romantic surprise when they're alone. Claire unexpectedly goes into labor in the forest, Jack is unable to deliver the baby, and Kate, Charlie and Jin go into panic mode when they must tend to Claire themselves. Having returned Boone to Jack, Locke disappears back into the forest amid the chaos.

A Jack-centric episode.