Fungus is worried, he has been spotted by a human dry cleaner on one of his trips up top; he and Mildew are despairing of their teenage son Mould, he is starting to become a drop-in-washing regularly, even using deodorant.

Fungus is distraught after losing track of Mould while on a journey up top; Mould somehow finds his way home but is grabbed by Jessica as he flees through the Bogeyhole, dragging her with him; Bogeydom now faces a crisis.

Jessica, with the unwitting assistance of Mould, manages to escape back home; Fungus and Mildew must create a plan of damage control; they determine that Fungus and Mould shall go back above ground to find Jessica.