The juvenile lead was successively played by James Ellison, Russell Hayden, George Reeves, Rand Brooks and Jimmy Rogers. 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 movie comedian Andy Clyde as California Carlson.
Hayes
Harry Sherman