This thread reminded me of Fringe, which I watched a few episodes of when it was new then sort of forgot about until a couple weeks ago. It starts out very silly, but builds up an incredible story which defies the tropes normal TV usually goes for. Some of the actors playing characters only in a single episode are just astonishingly good, and while the main cast didn't portray characters that I liked early on (with the exception of the character Walter Bishop, the series' biggest drawcard for me, superb mad scientist), the way they handle some of the really challenging stuff later on (which I can't describe without massive spoilers) impressed the hell out of me. I see some really nice Philip K. Dick, Arthur C. Clarke and Neal Stephenson influences in the story, among others; I think there's some serious nerds behind this show, and the way the series progresses hints to me of the nerds winning a war against the TV execs.