Eleven-year-old Johnny is part of the Test family, consisting of his 13-year-old genius twin sisters, Susan and Mary, and his over-the-top parents. His mother, "Lila," is a businesswoman, and his father, "Hugh" is an obsessive-compulsive househusband. Hugh's two biggest obsessions are cleaning and cooking meatloaf. The Test Twins frequently use Johnny as a guinea pig for their various experiments and inventions in their laboratory filled with highly advanced technology built over the Tests' household attic. Most of them involve trying to impress their pretty boy-next-door neighbor, Gil, for whom both harbor a deep love and obsession, although their attempts to come up with some way to attract his attention usually fail.
