Man, that scared the hell out of me when I was a kid. Haven't seen it in decades. A bet the jokes went over my head at the time.
Buffy was inspired in part by it, according to Joss Whedon.
Woah! Just looked it up in IMDB and it looks like Richard Matheson was a writer on the original TV movie that the series was based on. He did a short story that Omega Man was based on and a lot of horror writing.
I'm surprised it was only one season. I remembered it as going longer than that.