It may be hard to believe, but at one time Dean Martin and Jerry Lewis were considered the hottest, hippest, funniest act around. NBC Radio banked on this and sign the duo to a five-year contract (the network had just lost both Jack Benny and Amos & Andy to CBS radio). What NBC forgot to take into their calculations was that Martin and Lewis were mainly a visual act and that radio was not exactly a visual medium. The show was greeted with a mixed reception. Eventually new script writers -- including Norman Lear -- were added, improving the show somewhat. The Martin & Lewis Show ran from April 1949 to July 1953.
Linked below is an episode featuring Hopa;;ong Cassidy himself, William Boyd.