Many of the scenes are set in the Grimley brothers' school, alongside their sadistic PE teacher Doug "Dynamo" Digby (Brian Conley; Jack Dee in the pilot), who lives in a corner of the school gymnasium. Doug always takes both pride and pleasure in bullying his pupils, perhaps due to the behaviour of his thuggish father (Lewis Collins). Doug is dating Geraldine Titley, much to Gordon Grimley's chagrin, leading to increasing tensions between them. Also present is Amazonian gym mistress called Miss Thing (Ruby Snape), whom Digby seems to fancy.