Yeah, I know what you mean. I usually think zombies are the second-most ridiculous and boring thing on earth (the worst one being sparkling vampires

), but everything I have read about that series so far sounds really promising. I'll definitely watch the first 6 episodes. The trailer looks pretty good and I just love that they premier on Halloween.

Since my own interest in William is mostly long gone I don't care too much if he's in it or not, but I think we probably would have heard about it by now if he was in one of the first 6 episodes. Apart from Lennie James and Michael Rooker I don't know any of the actors in that show, so if William had a guest spot on one of the eps, I expect it would have been mentioned somewhere, since he easily would have been the most high-profile name on that whole cast list (which in itself is a hilarious thought, considering how under the radar he likes to stay).
But, hey, if the show is as good as it looks from here, maybe they will get a second season and maybe he will be in that.

And if it turns out to be total crap, it's better he wasn't in it to begin with (after all, he already has quite a few clunkers on his resume).