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Little is known about Dr. Mark Sloan, the newest full-time character on Grey's Anatomy, but that doesn't mean he isn't noteworthy. In fact, his being shrouded in mystery for much of the series only increases his appeal.
That, and he's McSteamy. He's the man, revealed in Season 2, who was the catalyst in Derek and Addison's divorce. It was upon walking in on Mark and Addison in bed together that Derek fled New York for Seattle.
There, the neurosurgeon began a romance with an intern named Meredith, and the rest is history. Well, sort of.
When Addison eventually came out to Seattle, Derek took her back and they tried to reconcile. So when Dr. Sloan appeared one day, he was not well received... by Derek's fist. He sutured his own face after being cut.
Mark's purpose was to take Addison back to New York, as he is very much in love with her. A plastic surgeon, he ended up assisting on a rare operation during his brief stay and giving career advice to Alex.
Despite his best efforts, though, Addison did not follow Mark back to New York. But in the second episode of the third season, he appeared wearing nothing but a towel in Addison's hotel room, after receiving a transcontinental booty call. Mrs. Dr. Shepherd had just learned of her husband's affair with Meredith and embarked on a serious bender -- one that ended with Mark back in the Emerald City.
It was the most talked about moment of the season to date, but we're sure many more will come from Mark, who's sticking around and determined not to let Addison slip through his fingers a third time.