User blog comment:Realmartialarts/Know your sources/@comment-4890977-20120919185954/@comment-4652104-20120919194400

Well, Captain Obvious, there were a number of crossovers between DC and Marvel. So it is conceivable for Batman to battle one of the Marvel heroes within the confines of the Marvel Universe.

Which is really irrelevant, because the question is always "what if...", which does not really require that there be a viable opportunity for these characters to meet. It's like the age old locker room argument - would a samurai beat a knight? Well, they never met and never will, but this does not stop boys from wondering.