Given how popular Gunsmoke was, it's little wonder the show eventually birthed a spinoff. The offshoot itself, however, is basically lost media now.

An actor best known for working in sci-fi made a guest appearance on the final episode of Gunsmoke, but that wasn't his last ...

That is a horse of a different color — or black and white, as the case may be. Gunsmoke, which had a 20-season run on CBS from 1955-75, claimed a spot among the top 10 acquired series on ...