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Created in 1904 by writer Clarence E. Mulford, the Cassidy character appeared as a rough-talking cowboy in a series of popular stories and novels before segueing to the big screen in 1935 as a clean-cut hero. William Boyd played the character in 66 films throughout the 1930s, '40s and '50s. Affectionately known by millions as "Hoppy," the character also spawned comic books, radio serials and the first network TV Western series. Cassidy also became the first image to be featured on a lunchbox.