User blog comment:Mortsnarg/Other Wikis/@comment-25368842-20150219025901

I don't believe I have seen any official policy or rule on it, but I would tend towards wikipedia first, but if there is a reliable wikia page, there's no reason it can't be cited.

Let's face it though, there are some decidedly UNreliable wikias out there that are little more than fanzines and it can be problematic having to verify a wikia link vs simply being able to depend on what should be a more accurate wikipedia link.

In the case of your ecample, the wikia Walking Dead wiki is one I would consider reasonably reliable.