We’re watching “Star Trek: The Next Generation,” something I didn’t do seriously when it originally aired because I didn’t like it. I like it more now, though I feel like the repetitive narrative structures of the first season episodes must have driven my young mind into hysterics, not having any of the vocabulary to describe the sensation. Anyway. They actually expect a lot of repeat viewership. They’re not making the show for a causal viewer to pick up. We’re about three-quarters through the season and there’s nothing to let a new viewer in. Not in a bad way exactly, but it almost feels like “Next Generation” knew its target audience so well, it didn’t worry about growing it. But it eventually did, because it made new “Star Trek” fans. I know because I argued with them in high school.