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An adaptation of Raymond Briggs' children's classic that mixes live action and CGI animation to follow the adventures of a family of green monsters who live in the slimy underground world of Bogeydom. Fungus and his wife Mildew suspect their son Mould is illicitly dabbling in human culture, sparking a family argument that sees the boy flee to the surface. Above ground in Daventry, Daryl Hedge's go-getting wife Wendy won't let him forget it that he is unemployed, while his daughter Lucy has fallen for a disagreeable older boy called Dean.
Fungus, and his wife Mildew, must disguise themselves as humans and journey 'Up Top' in order to try and persuade their rebellious son, Mould, to return home.
Eve helps the new family move into their home, but Fungus has other things to worry about - he has been spotted on a security camera.
Daryl makes a discovery when he sneaks into the house where Fungus and his family are living meaning the whole family must risk it all if they are to stay together.
