Veronica starts to confront her PTSD; Harris and Chloe try to help a college football player with a possible brain injury; Angel and an eccentric patient butt heads.

Veronica considers seeing a therapist; Chloe starts to warm up to Dr. Briggs when she learns why he became a doctor; Sonia runs into an ex-boyfriend.

Veronica rekindles her relationship with Dr. Sands; one of Sonia's elderly patients makes a shocking announcement; Chloe and Briggs make a house call.

Following the donut shop shooting incident, Veronica is overwhelmed by PTSD. With a disturbing visitor arriving, Veronica takes off unexpectedly, leaving everyone worried. Back at the hospital, the victims of a bus bombing inundate the E.R., causing Dr. Briggs and Dr. Sands to fight over the only OR available. Meanwhile, Chloe battles a hangover on her second day in the E.R., Sonia tries to keep her infidelity from Valentino and Dr.Harris treats a patient that has a condition that causes her to make inappropiate sexual advances.

Veronica is trilled to be back with Dr. Sands but their first official date is ruined by a robbery. Meanwhile, Chloe and Guillermo are put to the test in the fast-paced, high-stakes world of the ER after being re-assigned there by the arrogant new head of ICU. While Sonia bonds with the son of the rich elderly patient, and she begins to question the lifestyle she has settled into with Valentino.

Dr. Joe Briggs, the new head of ICU arrives at Mercy. While, Veronica and Dr. Sands must set aside their problems to save a boy found nearly frozen in the woods. After the death of one of her patients, Chloe tries to help the grieving widower leave the hospital and Sonia continues her turn as a private nurse to an upper-crust family.

A newlywed cancer patient is in a risky treatment and Chloe struggles to help her husband. Meanwhile, a man wakes up after tn years in a coma and he decides to confront the love of his life, helping Veronica to take action in her own love life. Meanwhile, Sonia gets a taste of how rich people live when she has a wealthy and eccentric patient to care for.

Veronica has her hands full when a group of promiscous college students is admitted to the hospital with meningitis and their love triangle has the Mercy staff comparing them to Veronica's own love life. Meanwhile, Chloe helps with wedding plans when a bride-to-be comes in with a simple flu but receives a much more serious diagnosis. Sonia has to deal with a hand transplant patient who wants his donor hand amputated after discovering it belonged to a pedophile and Dr. Sands gets a surprise visit from his sister.

Veronica has her hands full when a group of promiscous college students is admitted to the hospital with meningitis and their love triangle has the Mercy staff comparing them to Veronica's own love life. Meanwhile, Chloe helps with wedding plans when a bride-to-be comes in with a simple flu but receives a much more serious diagnosis. Sonia has to deal with a hand transplant patient who wants his donor hand amputated after discovering it belonged to a pedophile and Dr. Sands gets a surprise visit from his sister.

Veronica helps a patient after a horrific experience on an operation that launches him into a faith crisis. Meanwhile, Veronica think Mike has move on and is dating someone. Sonia tries to helpa young patient after a car accident, but instead finds out a terrible secret that can change the patient life forever. Chloe helps with a family feud when her patients children can't agree on a treatment for their father.

Veronica turns to a vetrans support group for help with her Post Traumatic stress, while struggling with her fathers rapidly deteriorating mental health. While chloe is forced to treat her most diffucult patient after Dr Harris suffers a mysterious injury.

Veronica might be pregnant but worries that maybe not even a baby can save her marriage. She needs to regain control of her life, and decides to work with Dr. Harris against any death at the Hospital. Meanwhile, Sonia helps a beauty queen when she has to accept her life-changing diagnosis. Chloe unconvers a secret her boyfriend has been keeping from her, while Dr. Sands gets more close to Dr. Jelani while organizing a "Bike to Work Friday" activity.

After Veronica's affair becomes public, she and Mike reunite in a family crisis from Veronica's side. Meanwhile, Sonia is agitated when her high school rival comes to the hospital and ends up being her patient. Only to discover that the life of her rival life is not as perfect as she though. Later, things heat up between Chloe and her fireman, while Dr. Sands moves on from Veronica to another Mercy staffer.

As her affair with Dr. Sands surfaces, Veronica contemplates to come clean to her husband. Sonia gets relationship advice from a patient and questions her approach to dating, just as her boyfriend goes missing. Meanwhile, Chloe reunites with an ex-boyfriend but her plans take an unexpected turn when she learns some news.

After Veronica announces she's trying to get pregnant, to her surprise a pregnant woman and her unborn child need her help after a horrible car crash. Meanwhile, Dr. Harris, calls a meeting to determine Veronica's future at Mercy. Sonia helps a sleepwalking patient and her relationship with Valentino deepens, while Chloe goes on an ambulance and makes a discovery that will change Dr. Harris life forever.

Veronica, tries to decide if the affair with Dr. Sands is really in the past, because Mike wants to start a family with her. And, while helping a veteran get treatment, Veronica's own issues from Iraq surface. On the other hand, Sonia experience the good and the bad from dating a cop, while she has to deal with a fight between two patients who are in a love-hate relationship. Meanwhile, Chloe gives hope to a young cynical patient while thinking of taking her crush on Dr. Sands to the next level.

Grote is pressured by an influential man to perform an experimental procedure on his dying son, in which an ill alien would be sacrificed for his blood. The procedure fails and the son ends up saving an alien instead, with a reverse blood transfusion. Meanwhile, a female patient developing webbed fingers believes that she has been infected by an alien. Haylen diagnoses a guy she once dated as having Home Sickness Syndrome. Dru oversleeps on the first day of her residency.

A shuttle accident sends passengers to Mercy Point. Accused of disobeying the dead pilot's orders, the dying co-pilot is given a memory download on orders of ISC's Charlie Bantam. The doctors resist his cold approach. Lily Parks becomes Dru first patient. A patient with lunar pneumonia is treated in cryostatis by CJ and Grote. Batung gives world famous gymnast Nancy Curtis two artificial legs. He tries to understand her anger, ends up apologizing to her and trying to motivate her. Dru catches Lt. Salisaw and CJ making out in a supply room. ANI is praised and sheds a tear. Haylen and Rema's boyfriends are introduced.

A computer virus attacks a computer technician and soldiers. Operation in zero gravity saves an unborn baby and mother. Dru arrives as a new resident, confronting her estranged sister Haylen and former lover CJ. Grote tries to find his family. ANI is promoted to Head Nurse and helps save Tobitt who has resented her. CJ's past with Dru is discovered. Dr. Batung shows his skill but shows his dislike for humans.