Cristina babysits for Bailey and doesn't take to it well at all; Addison and Derek come to terms with their relationship; and heart patient Denny Duquette (Jeffrey Dean Morgan) keeps coming between Alex and Izzie. Natalie Cole guest stars.

A rash of deaths at Seattle Grace brings out the doctors' superstitious sides, especially Izzie, who fears the worst about Denny's surgery. Meanwhile, Derek and Addison rethink their living arrangement, and Richard treats an old friend. Ollie: Mary Kay Pla (more…)A rash of deaths at Seattle Grace brings out the doctors' superstitious sides, especially Izzie, who fears the worst about Denny's surgery. Meanwhile, Derek and Addison rethink their living arrangement, and Richard treats an old friend. Ollie: Mary Kay Place.

George overstays his welcome with Burke; Meredith learns a secret about her father; Bailey worries that her colleagues will treat her differently now that she's a mother; and Alex gets a lesson in bedside manners. Eileen: Mare Winningham. Finn Dandridge: C (more…)George overstays his welcome with Burke; Meredith learns a secret about her father; Bailey worries that her colleagues will treat her differently now that she's a mother; and Alex gets a lesson in bedside manners. Eileen: Mare Winningham. Finn Dandridge: Chris O'Donnell. Beatrice: Laurie Metcalf.