Special Guest Stars Jesse Spencer as Dr. Robert Chase Jennifer Morrison as Dr. Allison Cameron Kal Penn as Dr. Lawrence Kutner Anne Dudek as Dr. Amber Volakis Sela Ward as Stacy Warner Andre Braugher as Dr. Darryl Nolan Amber Tamblyn as Martha M. Masters Guest Stars Jennifer Crystal Foley as Rachel Taub Karolina Wydra as Dominika Patrova Zena Grey as Ruby Diane Baker as Blythe House James Le Gros as Oliver Co Starring Bobbin Bergstrom as Nurse #2 Patrick Price as Nurse Jeffrey Sparkman Jaclyn Jonet as Amy Patrick O'Connor as Dr. Frankel Patrick Quinlan as Patient #1