In the 1800's, Indian tribes were forced off the plains and onto reservations. Their horses killed or left to run wild, growing into great herds. A new breed of cowboy, the Mustang Hunter was born. It was at this time that Leif Nelson, an immigrant from Norway, arrived to live with his Uncle Martin in Montana. Leif first set eyes on the beautiful stallion while riding the lonely prairie. He witnesses him fight a grey stallion to the death for his mustang mares. He names the stallion Thor. The tale of this stallion in Montana spreads as riders from all corners of the land come with their best...