Dennis and his faithful hound Gnasher are out to make every day as much fun as possible, but their adventures often lead them into trouble. After a prank goes particularly wrong (or should that be right?) Dennis needs to find a way to pay for the damage. The menaces reason that the best way to raise funds is to offer a service everybody needs - a car wash. Sadly, however, Beanotown's cars just aren't that dirty - but where there's a Menace, there's always a way. Realising the natural enemy to a clean car is an indiscriminate bird, the gang menace up a remote-controlled airborne pooping system, but the fake-poop soon hits the fan when the Colonel - a keen ornithologist, naturally - decides he has to capture it.