It's the ultimate test of man against machine - or should that be dog against machine - as the Top Gear team set out on their most ambitious and arduous challenge to date. Jeremy Clarkson, James May and Richard Hammond are take part in an epic land race starting in the town of Resolute, Northern Canada, finishing 450 miles later at the Magnetic North Pole. Jeremy and James drive, of course. Their vehicle of choice is specially converted for the task. Richard travels on something a little less hi-tech - a sled pulled by a team of 10 Canadian Inuit dogs. Pitting dog power against horse power may sound like a one-sided contest but, given the nature of the terrain, there's no telling who will make it to the pole first. In fact, there's no guarantee that either team will make it to the finish line at all. less