Top Gear presents a Summer Special. James May and Richard Hammond look at the best new convertibles. Clarkson puts the Nissan 350Z through its paces, Top Gear's own James May nominates the Citroen DS as his 'Greatest Car', and supermodel Jodie Kidd is our 'Star in a Reasonably Priced Car'. Plus Top Gear finds the driving 'Master of the Universe' when a Dalek, a Klingon, a Cyberman, Ming the Merciless, Doctor Who (Colin Baker) and Darth Vader go head-to-head on the track.