This special compilation of the best ever challenges sees Jeremy Clarkson, Richard Hammond and James May go 70s retro in 10,000 pound supercars. Also, Jeremy takes on a tank in a Range Rover Sport, Richard tries to out-sprint a champion greyhound in a Mazda MX5 and James 'Captain Slow' May goes all extreme and takes on a BMX biker around Lisbon in a Renault Clio. Plus we find out what is the best convertible for wig wearers.