Two of my favorite shows might be worth a try
The Prisoner - Not really serialized heavily, but a solid Sci-fi show with good messages about individualism and Authority. There's some action, but it's mostly a talky affair. Very surreal, and not everything is explained.
Twin Peaks - Twin Peaks is only marginally sci-fi, so be warned, it is a genre blender. It takes a few episodes for the sci-fi fantasy element to even make itself prominent. However, I think you'd like it as it is heavy serialized week to weeks. It's one of the strangest and most mysterious shows I've ever seen. fanatastic.
and not recommended to you really, but more people should Watch the Jeremy Brett Sherlock Holmes series.....That's fantastic