Bash disagrees with the new ED chief over a patient with DID. Theo returns to the ED after the helicopter crash, and Mags is still adjusting to her new position in cardiology.
Bash meets Mags' parents for the first time over dinner. Theo helps a woman who is afraid of needles. Claire is overseeing a new nurse, who is very ambitious when it comes to patient justice.
Bash struggles with Canadian sanctions against sending money to his friend Saleh in Syria nad has to work with a difficult patient. June works with Dr. Singh in the Trauma OR. A patient of Theo's returns and is denied a kidney transplant.
While starting his dual residency in trauma surgery, Bash must make some difficult decisions. Mags must determine whether her boss really cares about the results of their research or the fame from it.
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, June has a difficult experience with a patient. Claire and Devi reach a breaking point.
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.
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.
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 a new terrain; Mags searches for a new cardiologist; June is fed up with her bosses; Theo attempts a stable dating life.
Bash faces is an important figure from his past and 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.