Fighting for mutant rights can take on all kinds of meanings. Time and again, the X-Men are thrown into conflicts with mutant terrorists. After all, their message is one of peace, of co-existence between mutants and average humans.

Most of the villains they encounter tend to have the same basic principles on some level; they simply fight for mutant rights in a more extreme and aggressive manner. Because of this, it’s no surprise that several of the X-Men’s biggest enemies would wind up joining the team, at least for a little while.

Some of these characters joined the X-Men for a very brief time, some have done it a few times, some of them ...

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