TVLand.com offers full episodes of "Gunsmoke" for free, as of 2015. The site streams five episodes at any given time, rotating out each episode every so often so another episode can take its place.
TVLand.com also offers a video clip of the theme song for fans to enjoy, as well as a list of all of the episodes in the show's long history and their descriptions.
"Gunsmoke" remains the longest-running dramatic series in the history of TV as of 2015, having run from 1955 to 1975. It centered on James Arness' character Marshall Matt Dillon and followed the goings-on in the town of Dodge City, Kansas in 1873.