A tiny budget. Written by and starring a largely unknown actor. This wasn't a recipe for success, even during the second Golden Age of American film in the '70s. But when Rocky released in 1976, it became a classic, telling one of the best-loved tales in human history — the underdog versus the giant. With never-before-seen footage and interviews, 40 Years Of Rocky: The Birth Of A Classic is the story of the little film that punched well above its weight.