Rick Moranis returns as wacky, absent-minded inventor Wayne Szalinski, a scientific giant who gets into huge trouble when he decides to use his infamous shrink machine just one more time. A tiny glitch causes Wayne, his brother, and their wives to shrink big time! Soon, they must brave household insects the size of dinosaurs, a treacherous loop-the-loop track in a toy race car, dizzying "balloon" rides inside soap bubbles, and more! Meanwhile, thinking they have the house all to themselves, the kids get into mega-mischief -- never guessing their pint-sized parents are watching their every move!