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Burke (Isaiah Washington) is on the verge of kicking George (T.R. Knight) out of his place. Meredith unearths yet another carefully guarded family secret when her stepmother Susan (Mare Winningham) shows up. To regain her much-feared stature as "the Nazi", Bailey (Chandra Wilson) demands to assist Derek (Patrick Dempsey) as he operates on an ailing child, but succeeds only in revealing her softer side (again!) And Alex (Justin Chambers) is forced to fine-tune his bedside manner after he blurts out the truth about a terminal patient (Laurie Metcalf) to the woman's daughter. Chris O'Donnell makes his first series appearance as handsome "McVet" (veterinarian, that is) Finn Dandridge.