Back in the 1970s and well into the 1980s, the three major networks would spend a lot of money on promoting their fall schedule. These segments are collected from those promotional materials, and although a lot of the shows disappeared quickly from their schedules, it's always fun to see the ones we actually remember (the hits) being promoted to people who've never heard of it. They're all treated with equal amounts of enthusiasm in the promos, even as 20/20 hindsight tells us some of them were absolute turkeys. I'm sure some of the stars recognized they were doing shows that would not make it, but at least they were getting paid! There was always a certain feeling of "let's throw everything against the wall and see what sticks" when developing shows back then.
I've seen several of these videos and they remind me of shows I'd long since forgotten, and it's obvious the maker of the videos loves brushing away the cobwebs in our heads.