Have Gun - Will Travel is an American Western series that revolves around the adventures of "Paladin," a gentleman investigator and gunfighter who travels around the Old West working as a mercenary hired to solve problems. Paladin prefers to settle conflicts without violence but is highly skilled in combat when necessary. The character comes from a wealthy background, is highly cultured, and resides at the Hotel Carlton in San Francisco when not working. As a hybrid between Westerns and private detective stories, the show has been described as "the Thinking Man's Western."

Originally broadcast by CBS on both television and radio from 1957 through 1963, the television version starring Richard Boone was highly popular, ranking third or fourth in the Nielsen ratings during its first four seasons. The radio series, starring John Dehner, debuted in November 1958, making Have Gun - Will Travel one of the few shows in television history to spawn a successful radio version. The TV show ran for a total of 225 episodes, while the radio show produced 106 episodes between 1958 and 1960. Gene Roddenberry, the creator of Star Trek, was one of the lead writers for the series.

Sources: wikipedia.org, otrcat.com