Clarkson, May and Hammond made a most welcome return to our screens last weekend and tonight we see them setting off on a US roadtrip. And no, it's not quite like the rather dodgy one from that Top Gear Special. The time around they're taking three supercars down the west coast. As always, they manage to get themselves into a spot of bother. Mick Fleetwood (Mac) is tonight's Star in a Reasonably Priced Car. Also going Stateside is Brian Cox. See lots of him, and very little wildlife, in 'Wonders of Life' at 9.