In episode four of Threshold, we meet Robbie Magnan of the Fort Peck Tribes. He believes his community can prosper in the future by reconnecting with their roots as the Tatanka Oyate — the buffalo people. Magnan has built a quarantine facility that could be an alternative to the Yellowstone bison slaughter, but right now it sits empty while more than a thousand bison are being culled from the herd. Why? We'll learn more about Magnan's vision for bison restoration, and investigate why some people are opposed to it.