The Puzzler, a villain with a fondness for both Shakespeare and aviation, indicates he is after the fortunes of Artemus Knab. He convinces the billionaire to invest in his puzzle balloon business, but when the Dynamic Duo find that Knab seems too intelligent to fall for a phony scheme, they look deeper for the criminal’s true intentions. Their search leads them to Knab’s airplane monopoly, but unknown to them, the Puzzler has plans to halt their investigation – permanently. (thetvdb.com)