Brian "Sene" Marc

Voight employs his new informant to help solve a tricky drug trafficking case; Atwater, who once again struggles to reconcile his personal and professional life, reaches a decision.

Dr. Murphy questions his decision to give the new residents autonomy when an intern's misdiagnosis has dire consequences; a patient has a ruptured cyst affecting key functions of her brain; Dr. Morgan Reznick and Park bond over failed relationships.

When the hospital is hit with a cyberattack threatening to shut down life-saving machines, Lea rises to the challenge and looks to outsmart the hackers to prove herself; the team treats an inspirational cancer survivor who harbours a dark secret.

With several candidates vying for residency at St. Bonaventure, Lim tasks Shaun, Claire and Alex with mentoring the top first-year resident contenders; Shaun inadvertently insults Lea while discussing the pros and cons of a controversial surgery.

Morgan and Shaun's pregnant patient with twins has pain, forcing the doctors to grapple with a decision no one wants to make; Shaun asks Lea to move back in despite her reservations.

Dr. Morgan Reznik discovers her patient's wealth and obsession with extending his life is a dangerous mix that could end up costing more than he can afford.