This season, Emmy and Golden Globe nominated actor, Rob Lowe, joins the cast as Ethan Willis, an aggressive and rebellious military doctor who imparts his knowledge in combat medicine. Other new characters include Han (Noah Gray-Cabey), a sweet and sociable new doctor; Noa Kean (Emily Tyra), a confident and defiant street-smart doctor; and Charlotte Piel (Nafessa Williams), a former child star who leaves her acting career to become a doctor.