The X-Men are Marvel's most popular team and have starred in some of the best and most momentous centennial issues in comics.
The X-Men are Marvel's number one mutant hero team, but these five great mutant heroes have never joined their massive ranks.
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10 best X-Men antiheroes introduced since 2000
Over the last few decades, X-Men has introduced dozens of awesome characters who occupy the moral gray - here are the ten ...
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