Tom Cruise and Cameron Diaz attempt to set lap times around the Top Gear test track as the Stars in a Reasonably Priced Car. Plus, Richard Hammond is in Sweden for a race against some hardcore snowmobilers, James May attempts to break his personal speed record in a brand new, even more powerful version of the amazing Bugatti Veyron and, in the year that legendary F1 star Ayrton Senna would have turned 50, Jeremy Clarkson finds out why he's still considered the best driver of his generation.