10 Marvel Villains Who Became X-Men, Ranked by Power

Several well-known X-Men actually began as dangerous villains, eventually turning into the heroes we know and love. Others were X-Men for only a short time before going back to being villains. Recently, during the Krakoa Era, many former enemies became important allies, even taking leadership roles in the new mutant nation. Here’s a look at some of the most powerful villains who’ve joined the X-Men and why they’re now fighting for mutant success.








