Mike journeys to an uninhabited island to hunt a herd of wild buffalo with help from the local natives; Lauro pushes himself training for the upcoming Iditarod with a grueling 260-mile run through the Alaskan wilderness.

Marty rebuilds a snowmobile from scratch, before facing off with a wolverine menace on his trapline; Lauro feels the fatigue on the Iditarod trail and makes a costly wrong turn in the dark.