Special Guest Stars William H. Macy as Dr. David Morgenstern Guest Stars Ellen Crawford as Nurse Lydia Wright Tracy Vilar as Doris Brent Jennings as Nat Nick Offerman as Rog Lisa Edelstein as Aggie Orton Justina Machado as Ms. Cruz Nicki Micheaux as Mrs. Williams Summer Phoenix as Petra Darnell Williams as Theo Williams Peter Birkenhead as Bite Victim's Father Sherman Howard as Mr. Schoenberger John Pleshette voices Stuart Jessie Nelson as Bite Victim's Mother Jesse Borrego as HIV-Positive Patient Curt Bisquera as Drummer Gerald S. O'Loughlin as George Co Starring Conni Marie Brazelton as Nurse Connie Oligario Deezer D as Nurse Malik McGrath Emily Wagner as Paramedic Doris Pickman Laura Cerón as Nurse Chuny Marquez Lily Mariye as Nurse Lily Jarvik Lyn Alicia Henderson as Paramedic Pamela Olbes Montae Russell as Paramedic Dwight Zadro Kristin Minter as Randi Fronczak J.P. Hubbell as EMT Lars Audia François Chau as Neuro Resident Silas Weir Mitchell as Luis John Hawkes as P.A. Googy Gress as Head Lac David Stifel as Boz Matthew Fishman as Todd Lebeck Darion Basco as Justin Chang Carlos Alvarado as Gang Member Audrey Gelfund as Weeping Woman
