Season Finale: Mario decides to confront Angus; Christa is faced with a surprise; Dr. Mark Taylor returns to help Leanne find money in the budget for the nurses.
Colonel Ethan Willis joins the team as part of a program in which the Department of Defense sends doctors to hospitals to teach new techniques.
Willis must help a promising young soccer player make a life-altering decision after he's seriously injured when a bus carrying his entire team crashes, and another patient's hesitation to share that she's transgender makes it difficult for the doctors to diagnose her severe abdominal pain.
Willis, Mario and Heather perform a radical operation on a maintenance worker stuck under a boiler that exploded; Angus' father tries to seize power of attorney over Mike, who remains in a coma.
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