New X-Men (2001) #137
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The Stepford Cuckoos were five identical mutant sisters who enrolled at the Xavier Institute and soon proved to be the crème de la crème of Emma Frost's telepathy class.
Born with super-human senses and the power to heal from almost any wound, Wolverine was captured by a secret Canadian organization and given an unbreakable skeleton and claws. Treated like an animal, it took years for him to control himself. Now, he's a premiere member of both the X-Men and the Avengers.
Feared and hated by humans because they're different, the X-Men are heroic mutants, individuals born with special powers who've sworn to use their gifts to protect mutants as well as humans.