Scooby-Doo and Shaggy must go into the underworld ruled by the Goblin King in order to stop a mortal named The Amazing Krudsky who wants power and is a threat to their pals, Fred, Velma and Daphne.
In upstate New York, two teenage boys are tasked with cleaning out their father's old mobile home on an abandoned property, but the boys are in for a surprise when they discover three crooks on the run have taken refuge in the trailer.