Hopalong Cassidy is a fictional cowboy hero created in 1904 by the author Clarence E. Mulford, who wrote a series of short stories and novels based on the character. Mulford portrayed the character as rude, dangerous, and rough-talking. He was shot in the leg during a gun fight which caused him to walk with a little "hop", hence the nickname.
From the 1930s to the 1950s, the character became indelibly associated with actor William Boyd, who portrayed Cassidy first in a series of sixty-six films from 1935 to 1948, then in children-oriented radio and TV series, both of which lasted until 1952. Boyd's portrayal of Cassidy had little in common with the literary character, being instead a clean-cut, sarsaparilla-drinking hero who never shot first. The plots of the film, radio and TV series were generally not taken from Mulford's writings.
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The success of the television series made Boyd a star. The Mutual Broadcasting System began broadcasting a radio version, with Andy Clyde as the sidekick (except for episodes 28 to 53 of the 105 episode series, when, for reasons unknown, he was replaced by several different radio actors). The show was syndicated from 1948 to 1950, then began broadcast on Mutual on January 1, 1950. At the end of September, the show moved to CBS Radio, where it ran until 1952.
