A demanding quadrathlon in Aberfeldy, Scotland, is entered. The competition features a nearly 1-mile swim across Loch Tay, 60 miles of fell running over seven hills above 3,000 feet, a seven-mile kayak, and a 34-mile road bike. Simon and Turbo, as Team Canada, push and pull one another over some daunting moments through their combined sense of discipline, while the young and hungry Hunter and Rory, as Team America, push forward full force.