The continuation of the life of mad inventor Rick Moranis, who has invented and built a machine that will enlarge objects rather than, as we previously saw, shrink objects (or children). While in the process of demonstrating his invention, his 2-year-old son gets in the way and is accidentally enlarged. He continues to grow until he is over 100 foot high. A comic tale of what happens when the tables are turned and people and buildings become playthings for a giant toddler.