Jason, who will grow up to become the head of the Argonauts, leads five other boys on a dangerous quest to save the kingdom of Iolcus, learning along the way what it means to be in command.

Still longing for adventure, Princess Helen of Sparta maintains her disguise as a boy to join her unsuspecting brothers as part of the crew of the Argo, the ship commanded by Prince Jason in his quest for the Golden Fleece.