Part 1 of 5. Scrooge McDuck is forced to take in his three nephews Huey, Dewey, and Louie, when their Uncle Donald enlists in the Navy. As they learn to get along, the mysterious El Capitan hires the Beagle Boys to steal a small wooden ship from Scrooge's museum, saying it is a map to a real treasure ship.
Part 2 of 5. Having learned about the ship of gold, Scrooge and the triplets follow the map to South America, in a race with El Capitan, this time aided by Scrooge's archenemy, Flintheart Glomgold. Both parties are caught in the region's legendary Monsopies rainstorms.
Part 3 of 5. An expert examines a coin from the sunken ship and declares it is from the legendary Valley of the Golden Suns. Scrooge flies to the Andes mountains to find the owner of a twin coin, and one half of the map leading to the Valley. He is aided by his nephew Donald, on temporary leave from the Navy, and pilot Launchpad McQuack.
After Scrooge goes off alone to follow the ocean currents to find the other half of the map, Launchpad and the boys follow his trail to Anarctica, where they are captured by a city of intelligent Penguins. they receive unexpected help from the boys' new governess, Mrs. Beakley, and her granddaughter Webbigail.
Having completed the map, McDuck and Co. finally fly to the Valley of the Golden Suns. From outside they are stalked by El Capitan; from inside they are threatened by Scrooge's increasing greed, which leads him to recklessly risk all their lives against the Valley's booby traps.
Webigail befriends a leprechaun cast out by his people. Scrooge inadvertently saves the little man's life, and, knowing that his people have to grant him a wish, demands that he be given their legendary "Golden Caverns" in return. When the little people scheme to punish Scrooge for his greed, Webigail and her friend must save him.
Uncle Scrooge forecloses on a loan for a movie studio. To improve it, he instructs Gyro to make the set for a space show, as real as possible. When he does, Huey, Dewey, and Louie go to space with their hero 'Major Courage,' where they are captured by aliens. How will they defeat the aliens and return home? Does 'Major Courage' have 'what it takes' when it is not an act?
Scrooge is the servant boy for his evil stepbrothers and evil stepfather. His fairy godmother prepares him for the ball, where he falls in love with the princess. She is kidnapped! How will he rescue the princess before midnight?
Launchpad is terrified of making a fool of himself in front of his flying-ace family when all the McQuacks are to appear at an air show together. Launchpad is to fly Scrooge's experimental fighter plane, the Mc-X. But when the Beagle Boys sabotage his practice efforts and put themselves forward as its test pilots, the entire McQuack clan must bond together to stop an aerial assault on Scrooge's money bin.
Scrooge realizes that he is not acting like a rich snob, which makes him unpopular among other rich people. He tries to raise his social status by acting rich, but the price of this turns out to be too high for him.
Gyro invents a time-stopping device, which gets stolen by the Beagle boys. The chase after the thieves brings Scrooge, his nephews, and Gyro centuries into the past, where they are all caught by pirates.
After recovering his money from the bottom of the sea, Scrooge has very little time left to deliver it to Macaroon and be declared the richest duck in the world. Glomgold and the Beagle boys will stop at nothing to prevent this.
Scrooge McDuck takes his nephews and Webby back to Scotland, visiting both Cottage McDuck, and Castle McDuck. However, the locals are fearful of the castle, claiming a supernatural hound haunts the grounds.
In the first part, Magica DeSpell tricks Scrooge with a magic mirror to get his lucky dime. In the second part, Duckworth becomes a baseball coach, even though he doesn't know a first thing about baseball.