A blackout requires the staff to treat their patients without the help of any technology; Bell orders the staff to stop accepting new patients; Conrad and Devon go against the mandate to help a child; Mina and Austin must perform heart surgery.
Bell grows frustrated when Conrad's dad and new chairman of the board requests Conrad's input in his discussions about hospital expenses; a sharp and sophisticated medical device representative tries to promote her costly products.
Nic and Conrad diagnose a happy husband and wife who are both admitted to the hospital with mysterious symptoms; Bell and Marshall butt heads on a work trip; A.J. turns down a request from Bell despite Mina's forewarning.
Chastain is flooded with concertgoers when a stampede at a music festival leaves many in need of doctors; Bell stirs the pot when the hospital's revered orthopedic surgeon demands a better resident.
Bell decides to use a new medical device company rather than the hospital's usual products; Kit and AJ must stop their feuding to team up against him; Conrad and Nic work to make a child's dreams come true after finding out his cancer has returned.
Conrad must diagnose a young woman who gets admitted after having extreme night terrors; Devon faces his first Halloween in the emergency room; Nic panics over her decision to bring her newly sober sister to Mina's epic annual Halloween party.
When drug trial patients start suffering life-threatening side effects, Nic fears that her sister Jessie may be in danger; Nic and Conrad try to convince Bell that the trials are not worth the risk; Devon uses Julian to test a product he's designed.
Conrad goes head-to-head with Bell after he recommends a risky medical device; Nic fears Conrad is getting overly attached to a patient; Mina and Austin grow closer while working on a difficult heart transplant; Devon embarks on a very difficult day.
Devon's doubts about his relationship reach a peak as his friends and family gather for his big wedding day; as Chastain's medical device company continues to succeed, Julian makes a discovery that leaves her uneasy about her involvement in it.
Lane Hunter's victims and their families are outraged when she is released from prison; Bell is continually tortured by Lane's manipulation; a patient suffers as a result of Lane's dangerous treatments; Devon worries when he doesn't hear from Julian.
When a medical device fails, an investigation pits Dr. AJ Austin against Quovadis; Devon treats a patient who's experiencing mysterious stomach pains; Nic forms a bond with her new partner at the clinic.
A nasty flu season is masking a terribly infectious disease; Chastain must race to quarantine and diagnose infected patients; Devon treats a lovesick patient who has flu-like symptoms; Conrad doubts whether Nic is prepared to take the next step.
Conrad, Kit, Mina and the Raptor work to save the life of a med student who is in need of a triple-organ transplant; Nic makes a rash decision regarding her sister.
Conrad attempts to surprise Nic with a lavish Valentine's Day dinner; Mina and Devon try to figure out how their seemingly healthy neighbor has suddenly passed away; Kit gives dating advice to a sex-injured patient.
Bell's confidence in Quovadis continues to waver when Henry Barnett is rushed back into the ER, experiencing seizure-like symptoms; Mina's past comes to light when her mother, famous Nigerian surgeon Dr. Okeke, pays a visit to Chastain.
The surgeons are determined to shut down Quovadis after Henry Barnett almost loses his life due to a device malfunction; Bell, A.J. and Conrad work to save the life of Chastain's favorite custodian.
The surgeons work together to save the life of the Raptor's old mentor; Marshall puts himself in serious danger to help take down Gordon Page once and for all.
Chastain picks up the pieces after the fallout with the corrupt medical device company Quovadis; Conrad and Alec team up to help a young gymnast experiencing mysterious symptoms; Bell rushes to Kit's aid.
When Atlanta is struck by a severe snowstorm, Mina must perform a big surgery to save the life of a young father; Devon teaches an important lesson about life and death to a first-year med student.
Devon is concerned when a mother's complaints go unaddressed after her delivery, and he pushes Bell to take drastic measures; Conrad must break the news to Nic regarding Jessie's worsening condition; a mother and son arrive with devastating injuries.
When the hospital has a severe blood shortage, Conrad must try every avenue to save a patient's life; Nic receives devastating news; Mina and Devon work with a new anesthesiologist who is not what she seems.
When a lottery winner is admitted to the hospital, Bell turns to him as a potential solution to Chastain's financial problems; Nic becomes infuriated when Alec suggests she meet with an organ broker in hopes of saving Jessie's life.
In an effort to save Chastain, Bell considers selling the hospital to a conglomerate, but Kit tries to make him see that the negatives will outweigh the positives; Nic tracks down Kyle and pleads for him to reconsider donating a kidney to Jessie.