10. Jean Grey
Jean Grey is not only one of the X-Men's most powerful members — she's also one of their most formidable foes. Played on screen by actress Famke Janssen, Grey was a good guy in "X-Men" (2000) and "X2" (2003), but became the villain called Phoenix after rising from near-death in "X-Men: The Last Stand." Jean's powers include telepathy and telekinesis. —Xfinity Entertainment Staff (Photo: Fox)
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