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 John Thomas Gauthier Billy Guest Star Dorrett White Nurse Estelle Carter Guest Star Mira Skye Korngold Justine Guest Star Henry Falk Liam Guest Star Sarah Steele Margot Williams Guest Star Marco Pigossi Dr. Beau Pedrosa Guest Star Ed Begley Jr. Duke Nichols Guest Star Anne Archer Bonnie Nichols Guest Star Amanda Walsh Serena Nichols Guest Star Kecia Lewis-Evans Joan Marie Guest Star Jake Epstein Alan Caldwell Guest Star Desmond Campbell Bar Owner Guest Star Justin Pearce Bar Patron Guest Star Mason McDonald Bartender Guest Star Mary Krohnert Suit #1 Guest Star Scott Dana Baker Suit #2 Guest Star Gabriela Velásquez Seizure Holiday Patron 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, Director Melissa Aouate Executive Producer Henrik Bastin Executive Producer Andy Serkis Executive Producer Jonathan Cavendish Executive Producer Will Tennant Executive Producer Sara Saedi Writer