The Uncanny X-Men have as many comic book villains (and the hottest X-Men women) as Jay Leno has cars. Meaning a lot. Bad guys like Apocalypse, Magneto, and Mister Sinister have been reeking havoc on the X-Men since 1963. Some of the X-Men themselves have crossed the line to the dark side, or even started out naughty, like Rogue, who was a member of the Brotherhood of Evil Mutants.Who is the most notorious X-Men baddie? This list takes a look at all the greatest villains in the X-Men's rogues gallery history in alphabetical order.