James Castrission and Justin Jones embark on a daring expedition to traverse Antarctica to the South Pole and back without any external help. They rely solely on their own strength, pulling their supplies and shelter over 1,140 kilometers of desolate ice, without the aid of sled dogs or wind kites. Throughout their grueling three-month ordeal, they face challenges such as frostbite, hypothermia, crevasses, and starvation in one of the most unforgiving environments on the planet. During this extreme test of endurance, Cas and Jonesy push their physical and mental limits, exploring the essence of sportsmanship and the resilience of the human spirit.