A 911 call from a bear hunter on Alaska's remote Kodiak Island sends pilot Keller Wattum out into some rough weather. The hunter is safe, but needs help transporting his prize kill: a massive Kodiak brown bear.

The Iron Dog is known as the longest, toughest, most extreme snowmobile race in the world. Racers brave wildly dangerous terrain, bitterly cold temperatures, and speeds well over a hundred miles an hour in this two-thousand-mile endurance race. To make their journey possible, the snowmobile racers on the ground rely on their Alaska Wing Men to be their flying "pit-crew."