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There seems to be no limit to the people and things which are capable of making their way to the Castaways' island. This time, the little uncharted speck of sand and foliage is the landing site for a huge meteor. The Professor (Russell Johnson) warns that the extraterrestrial rock may be festooned with radioactivity--and it sure seems like he's on target when the Castaways begin to age rapidly! This is the final episode of Gilligan's Island's second season.