High up the Duck Family Tree lurks King Dondorado, ancient ruler of a pre-Columbian South American empire. Now Scrooge McDuck wants to find Dondorado's treasure! But the King's ghost demands his vast wealth go only to the pure of heart. Is that why Scrooge and Donald are bringing Huey, Dewey, and Louie along? How many ways can this go wrong?

From saddling a super-powered bucking bronco with the Tamers of Nonhuman Threats to battling a mad scientist for Uncle Scrooge's McDuck Intelligence Agency, Donald is right where the secret action is... and right where Donald secretly wishes he wasn't!