Overview:Porsche, Audi and Nissan prepare to scale the Mount Everest of Motorsport. Porsche hang their hopes on F1 veteran, Mark Webber, who's nearly died on the course twice. Meanwhile, reigning Le Mans champs, Audi, have cocksure three-time winner André Lotterer leading the charge, while newcomers Nissan put their faith in Jann Mardenborough, a 23-year-old video gamer turned racing driver.