Wiley and Grampa have their hands full when Gramma--along with all the other grannies in Gingham County--is brainwashed by aliens who want to take over the planet with slimy alien hair products.
Despite a tornado warning, Wiley and Grampa go to Colonel Dracula's Monster Truck Spectacular, where they run into trouble and have to count on a disapproving Gramma for help.
When Grampa and Wiley sneak out of the house on a stormy Halloween night to attend Colonel Dracula's Monster Truck Spectacular, they run into trouble from which only Gramma and an F5 tornado can save them.
After fossilized dinosaur droppings contaminated the pet food across Gringham County Merle gets saber-toothed, Wiley's lizard becomes a tyrannosaur, but the worst is when Grampa turns into a caveman for consuming a tainted dog treat.
When Grampa is bitten by a rival soccer team's mascot and turns into a were-yote, members of the Ladies Quilting League offer to destroy him, but Hans Lotion has a solution that could be less deadly.
While Grampa and Wiley try to capture the legendary Moby Fizz, the "biggest, bloated, deformed bass" in Lake Putrid, they encounter many surprises, including the disappearance of Grampa's stuffed Froggy and a very unusual hula dance.
When zombies show up at their annual barbecue, Wiley and Grampa try to find a way to stop the hungry creatures from eating the other guests until Gramma comes to the rescue with a surprise weapon.