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 Todd Stashwick as Mr. Kramer Annette O'Toole as Madeleine Skurski Co Starring John O'Brien as Lab Tech Jeffrey John Cappon as John the Paramedic Jean Villepique as ER Nurse Tanner Buchanan as Lucas Mackenzie Aladjem as Emma Herbie Jackson as Adam Xander Taylor as Pablo Walker