The episode begins with Mr. Incredible, Frozone, and Mr. Skipperdoo discussing the previous events, that while they were gone an evil villainess named Lady Lightbug (described by Mr. Incredible as 'sinister, yet lovely') stole the bridge connecting the city, leaving cars stuck on either side of the river trapped. Resolving to amend the situation, Frozone builds a temporary bridge of ice, and the three skate away to find the nemesis. Arriving at an abandoned carnival, Mr. Incredible goes about searching for Lady Lightbug, lifting up various objects while stating that she is not under any of them. Mr. Skipperdoo hops to point out that the missing bridge is behind him. Lady Lightbug then flies out at that moment and informs them all of her evil plan to steal the free world's bridges, creating massive traffic jams and thus destroying their economies. She then proceeds to shoot a line of radioactive silk out of the end of her abdomen, tying up Frozone and leaving all as lost. Suddenly, Mr. Incredible throws a Ferris wheel at her, which she dodges. He then hops in a roller coaster, which then takes off flying toward Lady Lightbug. Mr Incredible knocks her out of the air, leaving her defeated. The missing bridge piece is restored and all returns to normal thanks to Mr. Incredible, Frozone, Mr. Skipperdoo, and democracy.
The end of the episode features a brief teaser of the next episode, featuring a gigantic anthropomorphic ear of corn yelling, “I’ll crush you, Mr. Incredible!” as the two prepare to fight.