In the 1930s and 1940s, Hollywood's Golden Age, RKO was one of the Big Five studios. Its lineup of acting talent during this period included Cary Grant, Katharine Hepburn, Fred Astaire, Ginger Rogers, and Robert Mitchum. Among the studio's most notable films are "Cimarron" (winner of the 1931 Academy Award for Best Picture), "Bringing Up Baby" (1938), "The Hunchback of Notre Dame" (1939), "The Best Years of Our Lives" (1946—the studio's only other Academy Award for Best Picture), and what some people consider the greatest film of all time, 1941's "Citizen Kane".