The introduction of the series, as Donald Duck joins the Navy and sends Huey, Dewey, and Louie off to live with their uncle Scrooge McDuck. Meanwhile, a mysterious man named El Capitán busts the Beagle Boys out of jail in order for them to help him steal an awkward treasure map in Scrooge's possession.

After foiling the Beagle Boys, Scrooge and his nephews decipher the strange marking on the map, which leads to a sunken treasure ship in Ronguay. However, Flintheart Glomgold and El Capitán are out to stop them at every turn.

Scrooge develops gold fever as he and the gang make their way to the Valley of the Golden Suns, all the while pursued by El Capitán.