I believe it was Bell’s Hells! I have CC on while watching and that’s the way the captions wrote it out. Personally, I also think “Bell’s Hells” flows better than “the Bells Hells.”
I mean, I guess, but it's not actually strictly necessary since it's back-end only (and technically, thinking about it now, it's better form to just go by campaign), but go ahead for consistency. I'll update this one since it needs to be updated across a bunch of articles and I can do that rather quickly.