Part 1 of 6 of the 1990 children's drama. While in hospital reporter Trevor Trotman meets Billy Webb, a young boy who enters his ward with a broken leg. Asking how he came to be in hospital, Billy tells him it is a long story and soon regales him with how he came to meet the mysterious Alphonso Bonzo. Billy is the swap king of his school, always able to make a deal with someone or other. Then one day a mysterious Italian exchange student turns up on his doorstep with an offer of a swap of his own. He offers his brightly coloured bag in exchange for his school bag, but little does Billy realize that his new bag has somewhat mysterious powers. br br Please note this is from a video recording as it has never been released on DVD or repeated since it's broadcast on January 4th 1990. As such there is one moment where there is a news flash that pops up about 7 mins into the episode and where it briefly loses it's sound. This is a fault from the actual broadcast and cannot be helped.