Bash's decisions lead to conflict with the new chief of emergency medicine; Mags struggles to save a patient who thinks the system gave up on her; June has trouble with her new roommate, and gets a work proposal from Novak; Theo has trouble adapting.

Bash treats a man with a rare medical condition. Mags gets a visit from her parents and goes above and beyond for a pregnant woman with an undiagnosed condition. A misunderstanding with a rabies patient lands Theo in trouble. June and Novak negotiate a tentative working relationship. Devi starts to make changes.

Bash treats a woman whose ketamine therapy goes awry; Mags loses confidence in her new boss; June realizes she has too much on her plate; Theo reunites with a young former patient whose life may depend on the death of another patient.

Bash finds himself at odds with his direct supervisor while they treat a couple of skydivers with a unique relationship; Mags speaks out against her supervising doctor; a mistake comes back to bite Theo.

Recovering from a personal crisis, Mags worries about how to get her life back on track; Bash takes an unorthodox approach to treating a soldier with PTSD; Theo treats a terminally ill child whose father is desperate for a drug trial.

Bash and Amira have an argument over her future; Bash treats a diabetic woman who is overly dependent on her 18-year-old son; Mags questions herself as she adjusts to very limited parameters.

Bash reels from Amira's bold decision; tensions flare at an after-work dinner party; Devi struggles to keep her staff in line as turmoil erupts over her leadership; Mags treats a highly sensitive person; Theo considers breaking some hospital rules.

Bash's life is scrutinized during his citizenship interview; when treating survivors of a building fire, Theo needs Bash's help with a scared young boy; Mags helps a recovering addict who swallowed her keys; June and Bash treat estranged brothers.

Bash's psychiatrist suggests an unexpected form of therapy. Mags gets evicted and meets an old patient who holds a grudge. Theo makes some questionable choices with a patient's mother. June's personal and professional worlds collide.

Bash tries saving a couple whose wedding was waylaid by gunfire; Mags' demanding teen patient needs birth control; June struggles with an old habit; an activist patient puts Theo in his place.

A software glitch takes down the emergency department; Bash explores new terrain; Mags searches for a new cardiologist; June is fed up with her bosses; Theo attempts a stable dating life.

Bash faces an important figure from his past and must solve a public health crisis; hospital administration calls Devi's leadership into question; Mags doubts all of her choices; June is asked to oversee a sensitive procedure.

Bash has a major realization; Mags faces an overwhelming health crisis; Devi stands behind her choices; June confronts loss; Theo witnesses a devastating event.

Bash and Mags team up to save a John and Jane Doe found in the woods. A fully qualified surgeon now, June sees her old mentor in a new light. Suspended from the hospital, Theo longs for the action while treating patients virtually. Devi makes a budget cut decision, which will have major consequences for the Emergency Department.

Bash jumps into a sinkhole to save a trapped pedestrian. Mags faces a difficult personal choice, while attempting to contain a potential outbreak in the Emergency Department. Theo does whatever it takes to help a boxer with severe chest pain. June connects with a volatile patient, overstepping Novak. Claire is having trouble adjusting after a past assault.

Bash and Mags fall into friendly competition at work, and a man with superhero ideation crash lands into the Emergency Department. June tries group therapy, and Theo faces a tribunal to decide his fate.

Devi decides between Bash and Mags. Bash helps a young single father with nowhere else to turn. June and Novak take different approaches with a resident. Theo treats a teen patient with a connection close to home. Mags gets life altering news.

Mags shares big personal news with her colleagues, which has an effect on Bash. June sees a patient with a specific phobia. Theo bumps against a protective family doctor while trying to help a returning young patient. Claire looks for help but finds Devi stretched thin.

Mags undergoes transplant surgery and copes with the aftermath aided by her family and Bash. Bash balances personal and professional stress. June confronts Novak's self-sabotaging behaviour. Theo navigates a visit from his father and thwarts Liz's attempt to meet his family.

Bash passes on an opportunity, and works cases where things are not as they appear. Mags returns to York Memorial. June navigates loss professionally and personally. Theo goes out on a limb again for a patient. Claire is confronted by Devi and her colleagues about recent challenges.

Bash and Mags support each other through new challenges while treating an older couple who show up at the hospital glued together. Theo is called out by Liz Bergeron about his repeated inability to follow hospital rules.

Bash treats a man injured in a car accident who was saved by the woman who hit him. Devi decides to fight to hold on to the department. In a moment where it is most needed, a former member of the York Memorial team returns.

June and Novak have it out. Theo risks his life for a patient and makes a big decision. Bash rises to the occasion during an emergency and sees how far he's come.