Mike's mistake was to take his vacation at home - instead of escaping to the Grand Canyon as sensible people do. That meant the Brady household was wide open to most any zany guests who happened to drop in.
First came Aunt Zel, bringing her treasure in antiques that couldn't be broken - if her possible heirs knew what was good for them! And then came The Numbers Racket - a singing quintet out to blow the world's mind!
Something had to break - the heirlooms, the Bradys? Before they knew it, the Bunch - all nine of them - were rocking and rolling toward a family catastrophe!