After losing their boathouse in an accident, Donald Duck reluctantly agrees to take his nephews to visit their grand-uncle Scrooge McDuck. Enthralled by the wonders of the McDuck Manor, the triplets investigate family secrets.
Scrooge seeks to teach Louie the value of a days work but Louie ends up losing Scrooge's #1 dime. Meanwhile, Dewey and Webby get caught up in a conspiracy.
Webbigail meets a mysterious new friend called Lena, when one night she and the boys accidentally crash the Beagle clan get-together for Ma Beagle's birthday party.
After watching a scary movie about evil doubles, the kids decide to explore an eerie abandoned subway tunnel in search of the mythical underground-dwelling Terra-Firmians. Also, Launchpad becomes paranoid that Louie is an evil double.
At a mysterious casino resort in Macaw, China, Donald competes with his cousin and luckiest person alive, Gladstone Gander, to impress Louie. Meanwhile, Scrooge tries to lure the kids away from the resort's strangely endless distractions..
Huey competes with Dewey for a coveted internship with Duckburg's newest tech billionaire, Mark Beaks, while Scrooge and Glomgold team up to take this new competitor down. Also, a hired goon arrives to steal Beaks' secret project.