Victor Field (All the episodes had "Time" in the title.)Based on Ben Steed's books about the title character, "Kappatoo" was a light-hearted science fiction adventure that ran for two series about a boy called Simon in the present day who found out that he had a "time-twin" in the future called Kappatoo, who needed his help, which required that the two of them change places - Simon getting together with Kappatoo's computer (who was in human form, played by comedian Andrew O'Connor), and Kappatoo coping with the present day - with hilarious consequences...Okay, I wouldn't say hilarious, but they were entertaining enough; series one is notable for featuring Denise Outen (before she had surgery to implant the "Van") as Simon's crush object Tracey - one episode had her becoming duplicated, not a nice idea nowadays - while the second series cast Nicholas Parsons as a smarmy quiz show host (now there's a stretch) in the future, whose quiz Simon - being a genius, unlike Kappatoo - had to take part in while Kappatoo was in the present.At the end of that series there was an opening for a third one (Kappatoo's archenemy Sigmasix turned out to have his own time-twin in Simon's era), but it never came about. We call it Hitch-Hiker's Guide To The Galaxy Syndrome...