Lost Again
It is amazing that a series over three series has been able to avoid explaining even some of the most basic rules of the universe that it is in. It is obvious that it is some sort of fantastical premise -- but it is not clear whether it is a science fiction or fantasy series, or "how much" of either of those it is. It is not always clear who the good guys are and who the bad guys are -- and certainly people do bad things for good reasons, and may do good things for bad reasons.
But despite being so vague about the rules -- I rarely feel that this is a show that "cheats" -- it seems to be consistently playing by the rules that they've set out. Even though we don't really know what those rules are.

