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Now five castaways remain on the island: Katie Gallagher, Jennifer Lyon, Ian Rosenberger, Caryn Groedel, and Tom Westman. Of the five, one wins immunity in this episode -- and it isn't one of the women. As the existing alliances are sorely tested, tension mounts, with every player all too aware of his or her vulnerability. A nasty incident occurs when Katie accuses Caryn of conspiring with Tom, but this is minor compared to the battle royal between Katie and Ian.