Rita, Mike and Angelo return from their holiday in America and are looking forward to being back home. But suddenly Angelo begins to act even more strangely than usual.
Rita's mother arrives with a guest, her new fiancé Terence Creighton-Smythe.
Mike & Rita have a big fallout
Angelo's latest invention, a time machine made out of a shower cubicle, accidentally whisks Mister Pinner into the thick of the Battle of Hastings. At the same time, his ancestor, the lordly Sir Cyril de Pinner, is plucked from 1066 and plunked down in the middle of Rita's house.
When Angelo gives Brett Douglas a valentine's card, it sets off an amorous chain of events, as Brett believes that Rita is secretly in love with him.
Mike has a visit from his cousin, who does his utmost to get Mike and Angelo into trouble.
Brett is the victim of one of Angelo's crazy inventions.
Mike gets into trouble at school while Angelo gets hot under the collar.
Rita's boss comes round to give her a very important job as a television presenter. But it all goes wrong when Mike's friend Charles refuses to act pleasantly.
Rita's mother is depressed at the prospect of reaching 60 and is even more worried when she hears Rita and Angelo talking about getting rid of old things.
Mike and Rita's efforts to keep the truth about Angelo from Mike's grandma crumble when Angelo is discovered hopping around on the ceiling.
An escaped man-eating lion, a faulty door latch, and a Sony Walkman: three apparently disparate objects come together at the wrong moment to result in a day of unheard-of pandemonium at the King residence.
Angelo gets into star-gazing - but rather than take the roof off the house he does things the simple way by sloshing the ceiling with invisible paint. Simple, that is, until he accidentally tips a whole bucket of the stuff all over Mike, who promptly vanishes from sight.