One of the wolves.

Tonight on "Grey's Anatomy," Meredith contacts one of Derek's sisters which causes conflict for an intern caught in the middle. Watch the sneak peek below.

Watch the Grey's Anatomy Spoiler Video: Love Turns You Upside Down.

Get some scoop on the "Private Practice" series finale through's Primetime Dish, and read the Revenge Recap: Revelations on Soap Opera Fan Blog.

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- Candace Young