Board Thread:General Discussion/@comment-5210173-20130725170743/@comment-2133523-20131216100417

I personally see it as Canon, because, well, there's no indication of it being otherwise, it fits nicely into the story. I'd be a little annoyed if they turned around and told me it was non-canon, because there is seriously no need for it to be so.

As Ben pointed out, he goes to parallel dimensions all the time. And if Cow and Chicken are Canon, then this had better be.