Michael has always dreamed of being a farmer, and arranges a home exchange in which he and his family will move into a house in the rural farming community of Nilbog (which is "goblin" spelled backwards) for a month. The night before the family is scheduled to leave, Michael's son Joshua is contacted by the ghost of his dead grandfather, Seth, warning him that vegetarian goblins want to transform him and his family into plants so that they can eat them. Seth tells Joshua that goblins can turn people into plants by feeding them poisoned food or drink.