When overgrown lad Gary decides to take in a lodger he is motivated by money worries. In fact, neither original lodger, Dermot, nor Tony, his equally dead beat successor, prove much help in paying the mortgage. But each turns out to be a perfect partner in puerile behaviour! After a hard day's work as head of a failing burglar alarm sales office, Gary can't wait to get home to an evening beer, porn and crude jokes with his infantile flatmate. Much to the disappointment, if not surprise, of long-term girlfriend Dorothy. Meanwhile, first Dermot, then "Tone" fall head over heels for sophisticated upstairs neighour Deborah. Somehow, despite their amorous overtures, she doesn't seem terribly tempted...