 A no-faced zombie steals a rare coin from a shop. Scooby and the gang follow him to the Dilly Dally Dolly Co. where they find not only the zombie, but a gorilla as well. . . . Mr. Cool - a fat, bald man who wears nothing but shorts and yet is perpetually hot in the freezing environments he creates for himself - uses his freeze ray to put Big City at his mercy. Worse, he tricks Blue Falcon into sending Dynomutt to him for reprogramming. The altered Dog Wonder now is evil and wants to do Blue Falcon harm. Only Dynomutt s irreducible ineptitude can save the Falcon now.