The joke's on absent-minded scientist Wayne Szalinski when his troublesome invention shrinks him, his brother and their wives so effectively that their children think they've completely disappeared. Of course, this gives the kids free rein to do anything they want, unaware that their parents are watching every move.

Young Gregory Tudor sees his local ice cream man murdered and later grows up to inherit his business, opting to inject gruesome ingredients—including human body parts—into his frozen confections. When one of the neighborhood boys goes missing, the local kids suspect Gregory and band together to get to the bottom of things.

When Cody gets lost while exploring in the woods, he finds a friend in the legendary creature, Bigfoot.