I don't know if the walkers are supernatural. If I was still alive in TWD's world I'd be looking to science to find a cure.
Yeah, I wouldn't say supernatural, just far beyond what our science could actually explain. So uh, science fiction.
I don't think it's quite at the level of things like ghosts, gods, or anything ethereal. But it's definitely walking that line between sci-fi and fantasy.
No, I still can. I could compare it to a hypothetical mental hospital inhabited by dangerous and unreasoning insane subjects with a cannibalistic taste for human flesh.
Ok, I guess you could
... but I'm not sure I see the point in making a comparison to a hypothetical.