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Some ancient stone tablets unearthed on the island may provide the Castaways with the means to return to Civilization. Only one problem--the hieroglyphics on the tablets are virtually indecipherable, not to mention incomplete. As the main plotline plays itself out, Gilligan (Bob Denver) dreams himself back to Caveman days, thereby permitting producer Sherwood Schwartz to recycle a few sets from his recently cancelled sitcom It's About Time.