Special Guest Stars Kate Walsh as Dr. Addison Forbes Montgomery Taye Diggs as Dr. Sam Bennett Audra McDonald as Dr. Naomi Bennett Guest Stars Steven W. Bailey as Joe Brandon Scott as Intern Ryan Melissa George as Sadie Harris Ben Shenkman as Rob Harmon Jennifer Westfeldt as Jen Harmon Laura Allen as Beth Whitman Grant Show as Archer Forbes Montgomery Sam Anderson as Michael Whitman Co Starring Mark Saul as Dr. Steve Mostow Molly Kidder as Dr. Megan Nowland Gloria Garayua as Dr. Graciella Guzman Joseph Williamson as Dr. Pierce Halley Winston Story as Dr. Leo Byrider Candice Afia as Intern Laura Amrapali Ambegaokar as Dr. Dani Mandvi Tymberlee Hill as Intern Claire Kate Anthony as Nurse Kate