There's blood in the water with Rover out of the running. The competition intensifies as the four remaining teams face an onslaught of permafrost bogs, treacherous alpine ridges, and hidden mud holes. Bill and Butch set their sights on lower forty-eighters, Rich and Carl, hoping to push an already stressed Super Jeep into catastrophic failure. Meanwhile, the two sibling teams, outgunned by Super Jeep's sophistication and War Wagon's power, decide working together may be their best bet to bring the big boys down.