When Carl Sagan was a young boy he went to the 1939 World's Fair. His life was changed forever, and from that day on he never stopped marveling at the universe and seeking to understand it better. As a child, Carl spent his days star gazing from the bedroom window in his Brooklyn apartment. As an adult, he became an internationally renowned scientist who worked on the Voyager missions. Based on the children's book by Stephanie Roth Sisson.