Mannix

There's lots of competition in the private investigator premise for TV shows, but this was a standout in believability. Reminding one of the Johnny Cash quote, "Winners got scars, too", Joe Mannix got a fat lip or two but usually prevailed, or strategically retreated. Sort of a forerunner of the Jim Rockford character in occasional discretion-is-the-better-part-of-valor angles. Some episodes are now on VHS.