Board Thread:Questions and Answers/@comment-6312663-20130302175900/@comment-86191-20161023225342

Just my opinion, but I noticed that before the Crisis in the DC Universe that characters encountered each other as if they were in the same universe (Batman and Hulk, Superman and Spiderman, X-Men vs Teen Titans) but afterward it seems the Crisis split them apart because they became separate universes (DC vs Marvel, Avengers vs JLA, Fantastic Four and Superman). However, there are still some crossovers (Punisher and Batman, Spiderman and Batman) that still act as if they're in the same universe.