What was the first modern-style TV drama?

I would submit that modern-style TV dramas are defined by two main characteristics:

1. Although they are broken up into episodes, they are not episodic in nature. They have an overarching plot which is materially advanced in almost every episode, so you can't generally pick them up mid-series or skip an episode. They are intended to be watched from first episode to last, like an extremely long movie. These are shows designed for the era of DVR and streaming media.

2. They have acting and effects comparable to movies. If you walk into a room where one of these shows is playing on TV, you cannot generally tell at a glance that it is a TV series as compared to a movie. They also often have actors who have appeared in movies.

(I thought about adding a third characteristic here, which is that they generally deal with more adult themes and are more cavalier with language and sexuality than TV shows of previous eras, but I decided not to. I don't want to restrict possible answers based on that.)

So what would you say is the first truly modern TV series? I am no TV historian but I will say the first show I can remember watching and thinking, "This is something completely different," is the 2004 reboot of Battlestar Galactica. That show had effects far beyond anything I'd seen on a sci-fi TV show to that point, had a deep and engaging plot that was advanced in every episode, and had movie-level acting and direction. It did, in fact, feel like watching a movie that was thirty hours long (or however long the entire show would be watched back-to-back).

Anything further back than that that you think fits the bill?