Tops are off for a summer special as James May and Richard Hammond test the latest convertibles including the VW Beetle, Citroen Pluriel, Mercedes CLK, Mazda MX5, Daihatsu Copen and Audi Cabriolet, Jeremy Clarkson puts the Nissan 350Z through its paces and supermodel Jodie Kidd is the "star in a reasonably priced car". Plus a dalek, a Klingon, a cyberman, Ming the Meriless, Dr Who (Colin Baker) and Darth Vader go head-to-head on the race track.