Guest Stars Camilla Luddington as Dr. Jo Wilson Gaius Charles as Dr. Shane Ross Tessa Ferrer as Dr. Leah Murphy Tina Majorino as Dr. Heather Brooks Charles Michael Davis as Dr. Jason Myers Dominic Hoffman as Dr. Jeff Russell Annette O'Toole as Madeleine Skurski Todd Stashwick as Mr. Kramer Co Starring John O'Brien as Lab Tech Jeffrey John Cappon as John the Paramedic Tanner Buchanan as Lucas Herbie Jackson as Adam Mackenzie Aladjem as Emma Jean Villepique as ER Nurse Xander Taylor as Pablo Walker