Snow White and the Seven Dwarfs block-booking lock-in studios Walt Disney
In 1938, Walt Disney's Snow White and the Seven Dwarfs was released during a run of lackluster films from the major studios, and quickly became the highest grossing film released to that point. Embarrassingly for the studios, it was an independently produced animated film that did not feature any studio-employed stars. This stoked already widespread frustration at the practice of block-booking, in which studios would only sell an entire year's schedule of films at a time to theaters and use the lock-in to cover for releases of mediocre quality.
