Guest Stars Gregory Calderone as Dr. Billy Scott Don McKellar as Dr. Amos Carver Jonathan Koensgen as Officer Austin Bauer Alain Goulem as Elias Owen Maggs as Hunter Rush Co Starring Trish Fagan as Dr. O'Toole Emily Pope as Nurse Katrina Cyril Serrick as Tim the Perfusionist Kevin Bundy as Greg Rush Cynthia Preston as Lindsay Rush Mena Massoud as Justin Srinivasan Dan Redican as Guy