Wayne, an own scientist (Rick Moranis Rick Moranis), once again mismanipulates his dangerous scientific experiments, and this time the "victims" are himself and his brother, and their wives. In the accident, four adults were instantly shrunk to less than the size of raisins and could only be seen with a magnifying glass. They fight wits with "behemoth" cockroaches, and they have to find ways to let their children know the news. But the unwitting children did not notice the fact that their parents had been shrunk at all, and they could not hear the help of adults like mosquitoes. How should the desperate four adults ask the children for help? "Honey, I have shrunk the child" and "Honey, I have enlarged the child". This time it is the adventures and adventures of adults.