It's the most extreme challenge that the TG boys have ever undertaken - a 450-mile trek across frozen wastelands to reach the North Pole. The Magnetic North Pole, that is. That's important, according to James.

This is a Top Gear Challenge, so of course it's a no-holds-barred race. For once, Jeremy's not got a car to himself as he teams up with James in a polar-modded Toyota Hilux. Their opponents? Hammond... and a team of ten Inuit sled-dogs.

The smart money should be on the Hilux, but a combination of James's navigational skills, JC's inability to erect a tent and a generous supply of gin and tonic means that there's always an outside chance for Richard and his furry friends.

So it's machine against canine: a battle of wits and endurance through minus 65 degree temperatures, jagged sea ice and lots of polar bears.

Who will make it to the North Pole first? Will Jeremy finally lose a TG Challenge or will Hammond be eaten by his own dogs? And, most importantly, which will run out first: the gin or James's patience?