http://discovery.com/iditarod Across frozen rivers, barren tundra, mountains and thick forest in freezing temperatures, this grueling 1,150 mile race from Anchorage to Nome, Alaska puts mushers and their dog teams through the ultimate test of human and animal teamwork and endurance. Filmed in March 2008, TOUGHEST RACE ON EARTH: IDITAROD will tell its stories through the eyes of the men and women who dared to take on the ultimate test of human and animal teamwork and endurance. The intense preparation and training of race veterans and rookies alike show what it takes to compete not only against each other, but also Mother Nature.