Lauro begins the 1,000-mile Iditarod with his sixteen-dog team, pitted against harsh conditions and rugged terrain in one of the toughest races on earth. Bret and Ivy ascend into the Alaska Range on a high altitude grizzly bear hunt. Jake returns to the mountain after a dangerous encounter to continue his pursuit of a killer tom lion. Paul makes the final run of his trapline, and delivers a bounty of fur to a local trading post.