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 Mishel Prada Katie Rodriguez Guest Star Jonathan Kim Max Yoo Guest Star Alex Mallari Jr. Captain Dennis Freeman Guest Star Henry Falk Liam Guest Star Dorrett White Nurse Estelle Carter Guest Star Nabil Rajo Sam Mapesbury Guest Star Carolyn Michelle Claire Mapesbury 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 Kevin Rodney Sullivan Director Stasia Demick Writer