Board Thread:General Discussion/@comment-25396661-20140921221301/@comment-34326521-20140921222957

Mr.Mandude wrote: Ah, I get what you are saying. But the writers of the show have said before that if something is labled non-canon, like a what-if episode, a comic, a videogame, or anything that wasn't shown in the show, then it took place in an alternate universe. If you have a cosmic destruction videogame, I believe they mention that in the bonus feature section. So thats why I asumed that Gwen 10, being non-canon, took place in an alternate universe. And that she was going to come from her universe into the mainstream one.

Yes, all non-canon material takes place in an alternate universe, but not all alternate universes are non-canon. Ben 23's universe, for example, is very much canon.