The Spear of Selene!

Scrooge and his family get stuck on the island of Ithaquack, home of the Greek gods, where Dewey and Webby try to search for The Spear of Selene and uncover the mystery of Della’s disappearance. However, Dewey struggles with the possibility that his mother may not have been a good person. They later find out that The Spear of Selene does not belong to the moon goddess Selene, who reveals that Della was a great person and friend. Meanwhile, Donald is dragged into a competition to settle a dispute between Scrooge and Zeus. Storkules, Zeus’ son and an acquaintance of Donald’s, encourages him to continue adventuring, even in spite of Della’s disappearance.