Imagine a world where every patient who needed an organ transplant could receive one right away. Such a future is promised by xenotransplantation, the experimental process of transplanting genetically modified pig cells and organs into humans. But while a scientific breakthrough in cross-species transplants could offer hope to millions of desperately ill patients, such procedures could introduce new infectious agents into the human population, posing a public health risk to millions. Do the benefits of xenotransplantation outweigh the still-unknown dangers? FRONTLINE presents a rare inside look at the multi-billion dollar xenotransplantation industry, including a secret transgenic pig organ farm somewhere in North America. FRONTLINE presents extraordinary cutting-edge footage of the organs being developed and an unprecedented glimpse into a bio-secure, air-locked barrier world where science fiction may soon become science fact.