Le professeur Philip Brainard (Williams), un chercheur aussi brillant qu'étourdi, est sur le point de découvrir une source d'énergie révolutionnaire et de rater pour la troisième fois son mariage avec le docteur Sara Jean Reynolds, la présidente du peu fortuné collège Medfield! En mettant ses propres théories sur le big-bang en application, Brainard crée une substance élastique et visqueuse qu'il baptise plaxmol. Il est ravi... mais toujours célibataire! Philip et son acolyte rebondissant, Weebo, découvrent que le plaxmol confère à toute chose la capacité de rebondir à toute vitesse et en tous sens. Mais certaines questions restent en suspens : le plaxmol sera-t-il assez miraculeux pour reconquérir Sara, sauver Medfield de la ruine et échapper au perfide homme d'affaires qui soutient financièrement le collège?

Bumbling professor Ned Brainard accidentally invents flying rubber, or "Flubber", an incredible material that gains energy every time it strikes a hard surface. It allows for the invention of shoes that can allow jumps of amazing heights and enables a modified Model-T to fly. Unfortunately, no one is interested in the material except for Alonzo Hawk, a corrupt businessman who wants to steal the material for himself.

Beleaguered professor Ned Brainard has already run into a pile of misfortunes with his discovery of the super-elastic substance "Flubber." Now he hopes to have better luck with a gravity-busting derivative he's dubbed "Flubbergas." Ned's experiments, constantly hampered by government obstruction, earn the consternation of his wife, Betsy. But a game-winning modification to a football uniform may help Ned make the case for his fantastic new invention.

Fatty invents a liquid with flubber-like properties which makes objects resilient and unbreakable. Unfortunately, in his rush to get out of the house to demonstrate his invention, he unknowingly grabs a jar of moonshine instead of the jar which holds his wonder liquid. To make matters worse, as he drives to the demonstration, a football-sized beehive falls from a tree onto the cargo bed of his truck . . .

Three friends embark on a quest to find the last remaining copy of Flubber (1997)