Every seventeen years, the Midwest farm town of Walton hosts a mutually beneficial popcorn festival for extra-terrestrial college students on their equivalent "spring break." This year, one student goes missing and Max sends Ben's team to learn why. The town, in return for providing all the popcorn the aliens can eat while allowing them leeway for their ruckus, sometimes destructive antics, gets to keep all their poo (which is entirely twenty-four caret in nature). One townsman, going through hard times, opts to keep a student and all his droppings for himself, unaware of the dangers in feeding it things other than popcorn.
—statmanjeff