It's the ultimate test of man against machine - or should that be dog against machine - as the Top Gear team set out on one of their most ambitious and arduous challenge to date. A race starting in Canada and finishing at the North Pole; this is the Polar Special.

In The U.S. Special Jeremy, Richard and James are each given £1000 to buy a car and set off for an epic journey across America, stopping for various challenges along the way.