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Mild-mannered Henry Limpet (Don Knotts) longs to serve his country during World War II, but he can't pass the Navy's admissions physical. Classified as 4-F -- too small and too weak to be a soldier -- Henry takes a trip to Coney Island, where a magical wish changes him from a little fish in a big pond into, well, a fish! With a fin up on the enemy, Henry uses his new aquatic abilities to lead the Navy into battle as its ultimate secret