"Roddenberry famously pitched the original Star Trek as “Wagon Train to the stars,” but it’s not. It’s Have Phasers – Will Travel. Paladin didn’t ride off into the sunset. He rode off into the stars."

Taken from a great write up by the A.V. Club on what they deem the peak adult western T.V. serial, none other than Have Gun Will Travel, of course.

http://www.avclub.com/article/adult-western-peaked-have-gun-will-travel-209684