Scrooge and his family are stuck on the Island of Ithaquack, home of the Greek Gods, where Dewey and Webby try to search for the Spear of Selene, to uncover the mystery of Della Duck. Dewey struggles with coping the possibility that his mother may not have been a good person. They find out that the Spear of Selene does not belong to Selene (Nia Vardalos), Goddess of the Moon, who reveals that Della was a great person and a friend. Meanwhile, Donald is dragged in a competition to settle a dispute between Scrooge and Zeus (Michael Chiklis). Storkules (Chris Diamantopoulos), Zeus' son and a former friend of Donald's, encourages him to continue adventuring, in spite of Della's disappearance.