Thread:ADour/@comment-43611962-20190905024958/@comment-4651179-20190905034146

In the case of Godzilla, he was a character whose comic book rights were owned by Marvel at the time, similarly to Conan, which allowed both to appear in comics set in the Marvel Universe. In the case of crossover characters, the license still belongs to their respective holders, and Marvel never owned them, they only appeared alongside Marvel characters as part of an agreeement (be it third party characters appearing in a Marvel-produced piece of media, or Marvel characters appearing in a third party-produced piece of media). In the case of Ashley Williams, I assume he's an exception since the Marvel Appendix granted his universe a reality designation.