For over 35 years, a dedicated team of biologists has quietly shaped one of the most enduring and impactful wildlife research programs in America. Guardians of Yellowstone takes viewers deep into the wild heart of Yellowstone National Park to reveal the hidden lives of cougars as stealthy apex predators whose presence is vital to the health and balance of the ecosystem. Told across three distinct phases of research, the film chronicles the evolution of the Yellowstone Cougar Project, highlighting the groundbreaking science, tireless fieldwork, and unwavering passion of the biologists who are committed to understanding and protecting these elusive animals. Audiences will also get to meet specific cougars, each with their own unique story of survival, resilience, and connection, set against the stunning backdrop of Yellowstone's majestic landscapes. Through breathtaking visuals, intimate field footage, and deeply moving storytelling, Guardians of Yellowstone celebrates not only the cougars themselves, but the human guardians who ensure their legacy endures, reminding us all of the fragile beauty and interconnectedness of life in the wild.