Sidney Gibbons is always in trouble and, to make matters worse, he insists on blaming the mess he makes on his invisible friend – Kevin. This, however, changes when Sidney actually meets Kevin and discovers what it is like to be on the receiving end of bad behaviour. In a magical world of make-believe, Sidney finally comes to realise that he's been selfish and resolves to put things right for both his invisible chum and his very own mum.