What's the name of this suspense/sci fi TV show from the late 70's early 80's?

I remember watching a show in the late 70's or early 80's that I would like to see again. Each episode had 3 on-going stories. So each episode adds a little to each story. The episodes don't stand on their own. The first story was a wild west story: mid to late 19th century, small town, gunfighters, etc. This was no ordinary wild west story as there were aliens. I think I remember 1 episode where they showed a spaceship. That's all I can remember about that story. The second story was about a female investigative reporter. She finds out something really big is going to happen. She doesn't know what but it's big like a terrorist attack or assassination or something. The whole story is her following clues trying to figure out what this big event is. I thought it might have been Susan Anton but I don't recognize the names of her shows in the 70's and 80's on IMDB so I don't know if it was her. I don't remember anything about the 3rd story. I saw maybe 5-10 episodes and then I don't know what happened. It might have been canceled. That's not much to go on but that's all I can remember. Thanks for reading.