A version of Raymond Briggs' kids' classic that mixes live action and CGI animation to observe the adventures of a family group of green monsters that dwell in the craggy celestial environment of Bogeydom. Fungus along with his wife Mildew suspect their son Mould is illicitly dabbling in culture that is human, sparking a family argument that sees that the boy deep to the outside. Aboveground in Daventry, Daryl Hedge wife Wendy will not let him overlook that he could be jobless, while his daughter Lucy has dropped for a unpleasant old boy.