Donald Duck's nephews Huey, Dewey and Louie set off on a third volume of adventures with their rich but penny-pinching Uncle Scrooge McDuck in this collection of episodes from the popular animated children's series. But as the triplets jaunt off around the world in search of a mythical jewel with magical powers, the mischievous Beagle Boys -- led by their meddling matriarch, Ma -- are always on the trio's tails.