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 Al Calderon Nurse Silva Guest Star Bellamy Young Dr. Amelia Frederick Guest Star Dorrett White Nurse Estelle Carter Guest Star Sol Miranda Ana Torres Guest Star Joshua Diaz Jorge Torres Guest Star Michael Grassi Executive Producer 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 Harry Jierjian Director Greg Murray Writer Ryan McGarry Writer