Kate Walsh Dr. Addison Montgomery Actor Tim Daly Dr. Pete Wilder Actor Audra McDonald Dr. Naomi Bennett Actor Paul Adelstein Dr. Cooper Freedman Actor Kadee Strickland Dr. Charlotte King Actor Christopher Lowell William "Dell" Parker Actor Taye Diggs Dr. Sam Bennett Actor Amy Brenneman Dr. Violet Turner Actor Brian Benben Dr. Sheldon Wallace Guest Star Amanda Foreman Katie Kent Guest Star Hailey Sole Betsey Guest Star Kate Lacey E.R. Nurse Guest Star Joe McGovern Cop Guest Star Martin L. Carlton Anesthesiologist Guest Star Christina Cannarella Nurse Guest Star Shonda Rhimes Executive Producer, Writer Betsy Beers Executive Producer Marti Noxon Executive Producer Mark Gordon Executive Producer Mark Tinker Executive Producer, Director Jon Cowan Writer Robert Rovner Writer