The greatest scientist of the 20th century, and no one knows his name. This documentary tells the inspiring story of Dr. Maurice Hilleman, a man with a singular, unwavering focus: to eliminate the diseases of children. From his poverty-stricken youth on the plains of Montana, he came to prevent pandemic flu, invent the measles-mumps-rubella (MMR) vaccine, and develop the first-ever vaccine against human cancer. Responsible for more than half of the vaccines children receive today, he is credited with saving more than eight million lives every year. Now through exclusive interviews with Dr. Hilleman and his peers, rare archival footage, and 3-D animation, this film puts a human face to vaccine science, revealing the character that drove this bold, complex, and heroic man.