Analysis of information sources in references of the Wikipedia article "Marvel vs. Capcom" in English language version.
Seth Killian: So the history of the Versus series technically starts with X-Men vs. Street Fighter, but many fighting aficionados including myself really date some of the origins back to games called X-Men: Children of the Atom and Marvel Super Heroes which introduced things like chain combo and aerial rave [...] all of that lead us eventually into X-Men vs. Street Fighter...
Seth Killian: So the history of the Versus series technically starts with X-Men vs. Street Fighter, but many fighting aficionados including myself really date some of the origins back to games called X-Men: Children of the Atom and Marvel Super Heroes which introduced things like chain combo and aerial rave [...] all of that lead us eventually into X-Men vs. Street Fighter...