Zachary Quinto Dr. Oliver Wolf Actor Tamberla Perry Dr. Carol Pierce Actor Ashleigh LaThrop Dr. Ericka Kinney Actor Alex MacNicoll Dr. Van Markus Actor Aury Krebs Dr. Dana Dang Actor Spence Moore II Dr. Jacob Nash Actor Teddy Sears Dr. Josh Nichols Actor Donna Murphy Dr. Muriel Landon Actor Stacey Farber Michelle Guest Star Nabil Rajo Sam Mapesbury Guest Star Mädchen Amick Alicia Ramati Guest Star Chloe Avakian Gabby Ramati Guest Star Dorrett White Nurse Estelle Carter Guest Star Michael Grassi Executive Producer, Writer Greg Berlanti Executive Producer Sarah Schechter Executive Producer Leigh London Redman Executive Producer Lee Toland Krieger Executive Producer DeMane Davis Executive Producer Melissa Aouate Executive Producer Henrik Bastin Executive Producer Andy Serkis Executive Producer Jonathan Cavendish Executive Producer Will Tennant Executive Producer Charles Randolph-Wright Director Daniela Lamas Writer