When he adds up his score in an intelligence test and finds he has an incredibly high IQ of 166, Harry Lumsdon - and those who know him - are truly amazed.Now he can set forth to better himself in the bakery where he has worked for 16 years, and look forward to a bright new future. After all, he is a genius - or is he?

Following his dazzling success passing his driving test first time with nothing more than a few lessons on a milk float and the positive application of his new-found intelligence, Harry now has the rather awkward task of returning his borrowed car with an embarrassingly large dent in its side.

As a first step on his way to the top, Harry applies his genius to bakery van sales. Who better to show him the potential, pitfalls and perks of the round than would-be country and western star, Don 'Doughboy' Hudson?