Clint Eastwood narrates the history of Warner Bros., which opens with "You Ain't Heard Nothin' Yet (1923-35)," about the movie studio's first years, when its top star was a dog named Rin Tin Tin. Also remembered is its move into gritty fare featuring James Cagney, Edward G. Robinson and Barbara Stanwyck. Then, "Good War, Uneasy Peace (1935-50)" focuses on the studio's responses to the Great Depression and World War II, as well as its post-war film noirs.