Colt .45 (also known as The Colt Cousins) is a Western series which aired on ABC between 1957 and 1960. The 30 minute show derives from the 1950 Warner Brothers film of the same name starring Randolph Scott and formed part of the William T. Orr-produced "family" of Westerns which Warner produced for ABC in the late 1950s and early 1960s.
Roy Huggins developed the series, casting Wayde Preston in the part of undercover government agent "Christopher Colt". Colt's cover would be as a travelling Wild West pistol salesman, hence the double entendre of the show's title.
After about the first season, Preston and the studio had a falling-out and Christopher Colt's cousin, "Sam Colt, Jr.", portrayed by Donald May, became the series lead in 1959. Preston would eventually return for the final episodes.