William Boyd as Hopalong Cassidy.
From 1935 to 1948, 66 American Western films were produced featuring the character Hopalong Cassidy, played in all the films by actor William Boyd.[1] The films were at the time collectively known as "Hoppies". In the films, Hopalong, or "Hoppy", and his white horse, Topper, travel through the Old West while dispensing justice, usually with two companions: one young and trouble-prone with a weakness for damsels in distress, the other older, comically awkward and outspoken.[2]
The juvenile lead was successively played by James Ellison, Russell Hayden, Jay Kirby, George Reeves, Rand Brooks, and Jimmy Rogers.[3] George Hayes (later to become known as "Gabby" Hayes) originally played Cassidy's grizzled sidekick, Windy Halliday. After Hayes left the series because of a salary dispute with producer Harry Sherman, he was replaced by the comedian Britt Wood as Speedy McGinnis and finally by the veteran film comedian Andy Clyde as California Carlson. Clyde, the most durable of the sidekicks, remained with the series until it ended. A few actors of future prominence appeared in Cassidy films, notably Robert Mitchum, who appeared in seven films at the beginning of his career.