For the second consecutive year CBS brings viewers the off-road triathlon action of the sixth annual Nissan Xterra World Championship.

Airing on Saturday December 29th at 1:30 EST, the program is an hour-long special featuring 400 of the world's best multi sport athletes battling against each other and Mother Nature.

Taped on location in Wailea, Maui on October 14th, watch athletes as they test their racing skills in this off-road competition that has been described as part triathlon, part mountain bike race, and part survival of the fittest.

The programs follows competitors as they attempt to tackle this unforgiving course - a 1.5-kilometer rough water swim at Wailea Beach, a grueling 30-kilometer mountain bike on the slopes of Haleakala, and an 11-kilometer trail run from Makena to Wailea.

The broadcast will introduce you to some exceptional XTERRA athletes and racing drama on the hardest XTERRA course in the world. From the crystal clear waters of the Pacific, to the sharp lava rocks and kiawe thorns on the bike and run - Hawaii's natural obstacles are unlike anywhere else on earth.