The destruction of the Great West River Bridge and the blackmail demand made to the Travers Engineering Corporation spur the Dynamic Duo to investigate the matter, and they uncover a terrifying plot masterminded by the evil Dr. Vreekill.; Lois and Clark are given an assignment to get the feminine slant of the new World's Fair, and overhear a plot by an international jewel thief to steal the Madras Emerald before it can be displayed at the Fair in the House of Jewels.; A chance sighting of a mysterious yacht, while on the parachute jump, leads Slam and Shorty to help rescue the Princess of Robaria, who is in America to sign papers allowing her nation to sell the Robarian crown jewels.; Zatara faces the challenge of rounding up a pair of pick pockets at the Fair, who use a fake murder to draw attention away from their activities.; Slugger Slade decides to retaliate against the District Attorney for his conviction by kidnapping Dian.; Red, Whitey and Blooey investigate tainted beef that is being provided to the Army by contract.; Uncle George shows Jim and Jane the sights and exhibitions offered at the Fair.; Rex Tyler is ordered by his employer at the Bannerman Laboratories to conduct some scientific experiments at the Fair and is invited to perform at a wealthy estate.; Johnny decides to treat Daisy to a day at the Fair, but his wallet is stolen aboard the subway, an act the pickpocket will regret for the rest of his life.; A series of mis-adventures at the Fair leads Daisy to take extreme measures!; Ginger's mom asks her to go to the grocery and get the freshest eggs possible. Unfortunately, they have hatched by the time she gets home!; Four fantastic facts are featured, such as the fact the the Blue Danube is mostly yellow and that Colin Tapley landed an airplane backwards!