It's almost opening day at Yum Yum Fun Park - but something terrible has happened! Those mean and yucky Sourpusses have set out to spoil the big day. Come join the fun as those yummy-smelling Yums Yums meet scary sewer rats, trick a ferocious sewer gator and match wits with the Sourpusses. Will they be able to rescue their magic toolbox and complete repairs in time to make Yum Yum Fun Park... once again... the sweetest and most fantastic amusement park on earth?
Hick handymen Val McKee and Earl Bassett can barely eke out a living in the Nevada hamlet of Perfection, so they decide to leave town -- despite an admonition from a shapely seismology coed who's picking up odd readings on her equipment.
The first segment features an animated mummy stalking selected student victims; the second tale tells the story of a "cat from hell" who cannot be killed and leaves a trail of victims behind it; the third story is about a man who witnesses a bizarre killing and promises never to tell what he saw and the "in-between" bit is the story of a woman preparing to cook her newspaper boy for supper.