At The Republic Of Moldavia in The Gotham City World's Fair, The Riddler's scheme to use the law against The Batman is already taking shape, as the Moldavian prime minister slices into the Moldavian Friendship cake and unknowingly triggers a hidden bomb inside, releasing a concealed riddle. This riddle leads The Dynamic Duo to The Peale Art Gallery where they catch The Prince of Puzzlers, the Riddler in the act of taking a cross from its proprietor, Gideon Peale, at gunpoint. They stop him with an explosive but learn to their horror that Riddler's gun was actually a lighter and the cross was his to begin with. Riddler whistles and some lawyers arrive bearing subpoenas in which The Riddler hands to Batman. Batman is slated to be sued for false arrest!
The Dynamic Duo must uncover The Riddler's plot before the case comes to trial or Batman will be forced to reveal his true identity in court, completely destroying his value as an ace crime fighter and stunting his career forever.
Two hidden riddles in the legal documents lead Batman and Robin to the new What A Way To Go-Go! Discotheque. The Riddler informs his gang, The Mole Hill Mob, that Batman has had time to solve his clue. As the Riddler and The Mole Hill Mob make their way through an underground corridor to the discotheque, his plan is again put into action. Since Robin is a minor, The Boy Wonder is legally forbidden to enter the disco, so he waits outside in The Batmobile and monitors Batman on the Batscope. While Batman dances the Batusi with The Riddler's assistant, Molly, his orange juice is drugged. Watching from outside, Robin attempts to help Batman, but falls victim to The Riddler's tranquilizer dart gun. Riddler tries to steal The Batmobile but accidentally triggers its antitheft rockets. He then tries to destroy the car but the flames are extinguished by its Bat-o-stat Antifire Activator! Robin is carried away down a manhole by The Riddler and The Mole Hill Mob. Batman finds himself in no condition to pursue them and is forced to surrender his Batkeys to the police at the most inopportune time.
Meanwhile, at The Riddler's hideout, Robin is strapped to a table as The Riddler, who's surrounded by Molly and The Mole Hill Mob, attempts to operate on the unconscious boy.