Marvel Comics' Free Comic Book Day special will set up an X-Men / Avengers crossover. The relationship between the X-Men and the Avengers has always been a tense one.
Few Avengers have been there for the mutant race in their times of need — the Avengers didn't even react to the mutant genocide on Genosha, when 16.5 million mutants were slaughtered by rogue Sentinels. The X-Men have never forgiven this, with relations between former lovers Emma Frost and Tony Stark breaking down. Matters came to
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