Huey decides to throw a birthday party for Scrooge, despite everyone warning him that Scrooge hates celebrating his birthday. When Scrooge goes missing and the guests turn out to be his worst enemies, Huey decides to solve the mystery, unaware that the ghost of Scrooge's faithful butler, the long deceased Duckworth, is involved.
After not speaking to each other for ten years, Donald Duck reunites with his estranged uncle Scrooge McDuck when he asks him to babysit his three triplet nephews Huey, Dewey, and Louie for the day. The boys rekindle Scrooge's sense of adventure, and he invites Donald and the boys to live at McDuck Manor with him, along with his housekeeper Mrs. Beakley and her granddaughter Webby Vanderquack. Together, along with Scrooge's chauffeur and pilot Launchpad McQuack, the Ducks go on many new treasure-hunting expeditions and globe-trotting adventures while contending with villains like Flintheart Glomgold, the Beagle Boys, and Mark Beaks.