Crooks steal the Munsters car, plan a bank robbery, then mistake Herman for Big Louie. The crook that was supposed to have been sent to be the driver for the robbery.

The Munsters are chosen as the "Average American Family" by a national magazines computers. When Grandpa finds out, he wants no part of it and hides in the house after promising not to go anywhere. Herman and Lily take off to look for him. Marlyn gives the magazine writer and photographer a room while they are gone.