Jeremy, Richard and James are dropped deep in the Bolivian rainforest armed only with three shabby 4x4s which they bought untested over the internet from local small ads for a maximum of 3500 pounds each. They attempt to drive them from the heart of Bolivia to the coast of Chile, encountering local drug lords, the debilitating effects of high altitude and the terrifying sheer drops of the infamous Death Road along the way.

Jeremy, Richard and James take an Aston DBS Volante, a Ferrari California, and a Lamborghini Gallardo Spyder to Romania in search of an obscure stretch of tarmac that some hardcore drivers claim is nothing less than the greatest road in the world. James compares two powerful limos, the BMW 760i and Mercedes S63 AMG. The star in a reasonably priced car is Eric Bana.

The boys' propensity to be ambitious but rubbish, means the possibility of electrocution looms large this week, as Jeremy, James and Richard attempt to build their own electric car. On the track, the American Corvette ZR1 tries its best to compete with the German Audi R8 V10. Michael Sheen is this week's Star in a Reasonably Priced Car.

This week, the boys try to identify which car manufacturer has made the greatest number of great cars. A decision which will surely be reached, with much arguing and shouting. James takes a caravan to a camp site, but chooses not to clog up the roads for proper motorists whilst doing so and Jeremy drives a replica of a classic rally car on the track. Chris Evans is the Star in a Reasonably Priced Car.

Jeremy puts the Renault Sport Twingo 133 through a stringent examination in Belfast with a helping hand from actor Ross Kemp. Richard samples the delights of airport vehicle racing, Guy Ritchie is the Star in a Reasonably Priced Car, and there is also a group test of the latest high-performance off-roaders from BMW, Audi and Range Rover.

Jeremy Clarkson makes a film about the BMW X6 and ends up conducting one of the most expensive road tests in Top Gear history. James May drives the new Vauxhall Insignia VXR, accompanied by Margaret Calvert, the designer of Britain's road signs and Richard Hammond tests the 340,000 pound Lexus supercar on the Top Gear track. The star in a Reasonably Priced Car is blues musician Seasick Steve.

Jeremy Clarkson, Richard Hammond and James May attempt to prove that cars can be art by taking over an entire modern art gallery in Middlesbrough and filling it with motoring-related works, including some remarkable creations of their own. In their quest to prove that cars can be more popular than traditional art, the presenters set themselves the challenge of attracting more visitors to their exhibition than will visit a more traditional gallery over the same period, a task that forces them to engage in some unusual promotional activities. Also on the show, Jeremy is on the test track in a new British supercar, the sensationally fast and sensationally expensive Noble M600.