The hospital staff gathers for a potluck but when certain staff start acting strangely (vomiting, hallucinating) it becomes clear it's not from food poisoning but something else that was unintentionally baked into one of the dishes. As Lea and Morgan work to solve what happened, an uninhibited Park and Asher confront Morgan and Jerome about their relationship problems. Lim and Andrews work through their own differences.
Doctor Andrews treats a foster kid for injuries sustained at his group home; Shaun and team look to Lea's expertise with cars and auto repair to help a patient whose iron lung has broken; the patient's niece takes an interest in Shaun.
As Shaun and Lea head toward their wedding day, a documentary filmmaker has chosen to follow their lives to showcase relationships and weddings of atypical couples.
Sophie takes Lea out for a day full of luxurious wedding planning; after a nearly fatal oversight, Dr. Lim senses an underlying issue is behind nurse Villanueva's unprofessional behavior.
Shaun and Lea make a big life decision and are pleasantly surprised by the support they receive from their friends at the hospital; Asher struggles to accept that he and his father may never truly understand one another.
Shaun and Lea’s long-awaited wedding reception is interrupted by a violent attack at the hospital and the entire team must mobilize to save the victims. Meanwhile, the trauma of seeing people he cares for in life-threatening situations is affecting Shaun in more ways than one.
On their first day as surgical attendings, Dr. Murphy and Dr. Park meet the residents they will be overseeing; Lim returns to work while facing her new reality and the emotions surrounding the changes.
The team treats a famous marriage counselor after she injures her ankle; Dr. Audrey Lim is determined to get to the bottom of what really happened in the operating room during her surgery and sets off on her own internal investigation.
The team operates on a military reenactor whose attempt at authenticity has created an explosive predicament; Dr. Jordan Allen and Dr. Daniel Perez are in a race against time as they search for a severed foot.
Shaun, Asher and Powell treat a young patient on Halloween who has a rare hereditary disease, sending them down an uncharted path; Glassman and Shaun must overcome their differences to work together to try and find a solution for Lim's paralysis.
In the midst of a heatwave, Dr. Shaun Murphy and Dr. Danica Powell are at odds when it comes to their patient's surgery; when the hospital loses power, Lea and Dr. Aaron Glassman are forced to come up with a quick solution.
Freddie Highmore
Dr. Shaun Murphy
Richard Schiff
Dr. Aaron Glassman
Hill Harper
Dr. Marcus Andrews
Beau Garrett
Jessica Preston
Tamlyn Tomita
Allegra Aoki