Predator Alley

S1 E6: Only 32 miles — and a soaring waterfall — stand between the remaining herd and the finish line. Overcome by hunger, exhaustion and injuries, the group must fight to the end. A member with an infected leg is accused of slowing the group down, and dysentery and dehydration of another brings the herd to a standstill. Meanwhile, lethal predators continue to be an ever-present threat.