An unforgettable glimpse into the world of the mountain gorillas with Dian Fossey. In November 1902, German adventurer Captain von Beringe observed tall "manlike" apes in what is now Rwanda. It was the first ever recorded sighting of mountain gorillas. A hundred years later, National Geographic Television & Film has made an exciting discovery of its own - hours of never-before-seen footage of Dian Fossey studying and working with mountain gorillas. Passionate, fearless and committed, Dian Fossey devoted eighteen years of her life to study gorillas in the mountainous rainforest of Volcanoes National Park and has become a modern legend. Less well known, however, is Bob Campbell - the wildlife photographer and filmmaker whose footage and photographs propelled Dian and her work into the international spotlight. Campbell was hired by The National Geographic Society to film Fossey's work and from 1968 to 1972 he shot more than 70,000 feet of film. Ultimately, only a fraction of the original camera rolls were edited into a lecture film, which Dian toured with before publishing her book "Gorillas in the Mist". Now, National Geographic Channel is able to show highlights of this previously unreleased footage for an unforgettable glimpse into the world of the mountain gorillas and Dian's incredible rapport with them.