where last we left our characters , mills and pennystranded in another world and in danger of being devoured by a tyrannosaurus rextrina , john , sharon , and ray newly arrived in las vegas from the dangers of still another worldjerry on his way to fight vampires in washington , dcand grandpa bubba croak in the process of trying to find his granddaughter , penny , in the ancient pyramid that carried a pharaoh to the modern world : we may now return to our gang of petty thugsgoody , searles , and batterinewwho were hard at work on a scheme to make millions off the sale of a serum used to fight laughter disease , a modern plague .