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 Caterina Scorsone Dr. Amelia Shepherd Guest Star Brian Benben Dr. Sheldon Wallace Guest Star James Morrison William White Guest Star Michael Patrick Thornton Dr. Gabriel Fife Guest Star Amy Aquino Claire Guest Star Timothy Bottoms Irwin Guest Star Larry Clarke George Walters Guest Star Sarah Hagan Kim Walters, Lainie Guest Star GeffriMaya Maya Davis Guest Star David Grant Wright Troy Guest Star JoAnn Willette Kim's Mother Guest Star Jeff Skier Paramedic Guest Star Micah May ER Doctor #1 Guest Star Shonda Rhimes Executive Producer Betsy Beers Executive Producer Marti Noxon Executive Producer Mark Gordon Executive Producer Mark Tinker Executive Producer Jon Cowan Executive Producer Robert Rovner Executive Producer