X-Men: Children of the Atom
Along with Konami, another legendary Japanese developer that took advantage of Marvel's 90's desperation was Capcom. Capcom, at the time, was of course known for its excellent arcade games, especially the brawlers and the fighters. X-Men: Children of the Atom was Capcom's debut with the Marvel license and paved the way for some legendary fighters. There are superior iterations, but the one that started it all is just as important.