The high-flying fun begins when Donald Duck reluctantly takes his mischief-making nephews Huey, Dewey and Louie to McDuck Manor, stately home of their rich, reclusive, great-uncle Scrooge McDuck. Enthralled by the exploits of their once-legendary great-uncle, the triplets and their fearless new friend Webby unwittingly unleash secret totems from Scrooge's epic past, launching the entire family on a daring, deep-sea quest for the Lost City of Atlantis.