Hopalong Cassidy is a cowboy hero, created in 1904 by Clarence E. Mulford and appearing in a series of popular stories and novels. In print, the character appears as a rude, rough-talking "galoot". Beginning in 1935, the character, played by William Boyd, was transformed into the clean-cut hero of a series of 66 immensely popular films, only a few of which were based on Mulford's works. Mulford actually rewrote his earlier stories to fit the movie conception and these led in turn to a comic book series modeled after the films.

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