Maya and her unborn baby are fighting for their lives on the operating table, and Addison, Amelia and Fife try everything humanly possible to save them. Meanwhile, Sam operates on an incoming crash victim and later makes a grim discovery; Cooper makes an ill-timed but valiant effort with Charlotte, and the staff’s world gets rocked by an unexpected death.

During a dark moment in his life, Sheldon finds happiness with a new woman. Meanwhile, he becomes increasingly suspicious about his patient Nick's involvement in Sarah's disappearance.

When Pete discovers Violet clinging to live following a violent attack from a patient, he rushes her to the hospital where Addison and Naomi work together to save her life. Meanwhile, the location of Violet's baby are still unknown.

Charlotte continues to run the hospital from her bed; Mason starts acting out in school.

As Violoet chooses between Pete and Sheldon, she must also deal wtih a grief-stricken patient. Meanwhile, Dell worries about his daughter when Heather returns to town and Naomi debates moving to Pacific Wellcare.

The Seaside Wellness group stages an intervention for a defensive and volatile Amelia, who has resurfaced after disappearing on a 12-day drug binge with her boyfriend, Ryan. During the intervention, Amelia mercilessly attacks her friends one-by-one, and Addison, in particular, has trouble seeing her sister-in-law in her present condition.

Upon hearing that he must meet with Henry's social worker during a home visit, Jake fears that an incident in his past will come to light. Meanwhile, Addison becomes skeptical of Jake's needy patient and James continues to pursue Amelia.

In this Addison-centric episode, her role as a parent is challenged when Henry's biological mother reappears and asks to be more involved in her young son's life. Meanwhile Addison reconnects with her mentor, who shares a very painful secret.

Addison and Sam go for a hike in Malibu, they come across an expecting couple trapped in their car after an accident, they then perform urgent field care. Charlotte, Cooper and Violet treat a newlywed who, on his wedding night has taken too much Viagra. Pete and Sheldon go out to a bar together and end up falling for the same girl.

When Archer has a severe seizure, Addison and Naomi use every resource possible to determine the cause and a cure; Violet tells Pete and Sheldon that she is pregnant; Cooper cares for an abandoned patient.

Amelia makes the hard decision to enter a rehab facility, and finds strength through an 18 year-old girl, as they both go through the painful detox process. Meanwhile, Cooper’s strengthening bond with his son is tested by his allegiance to a patient in need, Pete and Violet’s marriage reaches a tipping point, and Addison collapses from her rigorous fertility treatments.

Cooper, Sam, Amelia and Charlotte try to save Pete's life after his heart attack; Addison's desire to have a child leads to a surprising encounter; Sheldon hopes to help Amelia with her alcohol addiction.

With her relationship with Kevin on the rocks, Addison finds herself attracted to Wyatt. Violet looks for a way to have a relationship with both Pete and Sheldon. Meanwhile, Cooper and Charlotte become closer after a family emergency.

Addison attends Henry’s court date and realizes that the judge still has some concerns about Jake’s past, Sheldon introduces Miranda to his friends, and Cooper’s efforts to secure a dream house are put on hold when Charlotte goes into labor.

Charlotte's attacker, Lee Henry, arrives at St. Ambrose Hospital, injured by his girlfriend and in need of urgent care, and Sam and Charlotte must decide whether or not to save his life. Meanwhile, Susan's health takes a turn for the worse, and Addison's mother, Bizzy, begs her daughter to do everything in her power to help.

Cooper is outraged when he gets bad news about Charlotte's sexual assault case.

Sheldon warns Sam that he may be in over his head when he insists on releasing Corinne from the hospital and caring for her at home; a badly beaten Scott arrives at the ER and is placed under the care of Pete; Amelia is encouraged to make a decision about her unborn child; and Jake's daughter grills him on his love life when he visits her at college. Meanwhile, Erica's health takes a turn for the worse.

Cooper returns to the online dating game with surprising results, Addison goes on a date with one of Violet's patients, and Naomi and Sam make a house call at a convent.

After hearing a patient's chilling confession, Violet turns to Sheldon for advice. Meanwhile, Addison tries to keep her grief a secret, Cooper and Charlotte adapt to their new reality and Sam confronts Sheldon about his denial.

Violet discovers she's pregnant, but is unsure which of the men in her life is the father of the child. Addison deals with her guilt for kissing Wyatt. Meanwhile, Charlotte proposes to Cooper.

Violet steps in to the middle of a dangerous situation.

As Erica's condition worsens, Cooper and Charlotte try to prepare Mason, who's in denial, for the worst; Violet and Pete find that they still have feelings for each other; Addison encourages Amelia to embrace her impending motherhood; and Sheldon and Jake treat a pregnant woman who was jailed for killing her other two children.

In an episode told from Cooper's point of view, we follow him from the moment of conception through a nasty fight with Charlotte, which inadvertently threatens the lives of their triplets. Meanwhile, Violet comforts a friend who is being advised to take her partner off life-support.

Derek asks Addison to work with his pregnant patient while Archer recuperates from surgery; Bailey and Naomi work together to find the cause of Sam's sudden asthma attack; Cooper, Violet and Pete treat a woman with postpartum depression.

Amelia, now sober for more than a year and on the mend emotionally, goes on a series of disastrous blind dates set up by the other doctors at the practice.

Cooper and Charlotte take Erica to Seattle Grace to meet with Derek, Lexie and Amelia regarding a very risky surgery; Scott tells Violet that he would like to take their relationship to the next level; and Addison finds herself caught in the middle of Sam and Jake's fight about a patient. Meanwhile, Sheldon warns Sam to be cautious as he deals with the return of his sister, Corinne.

At Oceanside Wellness, friendships are tested and secrets revealed when Addison discovers that Naomi is concealing the practice's financial problems. Meanwhile, Violet wonders what secret Cooper is keeping from her, while Cooper himself has to decide whether or not to reveal a medical secret to a patient. Dell quits his job at Oceanside Wellness Group.

Despite how Charlotte is choosing to deal with the aftermath of her sexual assault, her fellow doctors think they know what's best, teaming up to pursue criminal charges against her attacker. Pete gets a surprise visitor, his estranged brother, who has come to ask Pete to help release their sick mother from prison.

Addison plans Bizzy and Susan's wedding while trying to keep her distance from the overly flirtatious Dr. Rodriquez. Sam is concerned about the care his longtime patient is receiving, and Sheldon refers Charlotte to his mentor and friend for psychiatric help.

Charlotte suffers in silence after the assault; Addison tries to keep that night's events a secret.

While Addison deals with the unwelcome arrival of her father, Cooper is arrested because he refused to cooperate in a case involving a longtime patient. Meanwhile, Pete will stop at nothing to keep a terminally ill patient alive for as long as it takes for him to meet his new daughter.

Things get too close for comfort when Addison, Pete and Sam must come together on a complicated case involving a dad-to-be who comes down with tuberculosis and threatens the future of his new family. Meanwhile, with Violet still gone on her Costa Rican escape, Sheldon takes over helping one of her patients, Natasha, to get over her crippling fear of flying, and Naomi finds herself in a bit of a love triangle of her own.

Maya shocks Sam and Naomi, while Pete and Fife disagree on patient care.

Addison sends a pregnant woman to St. Ambrose for help from Noah after she experiences heart complications. Meanwhile, Sam begins to rethink his friendship with Naomi; Pete and Lisa's relationship becomes increasingly complex; and Sheldon takes a stand.

It's Maya's wedding day and while Violet helps Sam prepare, a furious Naomi still refuses to take part as she works with Addison and Pete to save a premature baby. Meanwhile, Cooper becomes suspicious of Charlotte's new boyfriend and thinks that he may be abusing drugs.

When Addison's patient and the life of the three unborn babies she is carrying as a surrogate hang in the balance, Sam's new girlfriend, Vanessa, and Addison are sharply divided on the course of treatment. Meanwhile Cooper seeks Sheldon's help with a young patient, but their personal quarrels over Charlotte get in the way, and Naomi has a dilemma of her own between William and an unexpectedly charming Dr. Fife.

After her open-ended escape to Costa Rica, Violet has finally returned home and to the practice. Everyone treads a little lightly around her, especially Pete and Addison who have mixed feelings about Violet's desire to reconnect with Lucas. Meanwhile Amelia butts into Sam's personal life, pointing out that he can mend hearts in the OR but can't seem to do that for himself; and Sheldon encourages Charlotte to reconcile with Cooper, while Cooper deals with a young patient who eats everything in sight.

A couple wants to harvest eggs from their unborn child who is not going to survive, and the doctors cannot agree what the right path is; meanwhile, Amelia tries to comfort a friend while waiting for test results for Huntingtons disease.

Pete and Violet prepare for their wedding day; things take a surprising turn with Addison and Sam; despite disagreements, the doctors come together to mourn the loss of Dell.

The man responsible for killing Dell and endangering Maya's life comes to the clinic with a heart condition; news of Addison's new romance is not received well.

Addison performs a complex utero surgery, proving not only her talents to her father but giving them some common ground. Sam and Naomi deal with have a family crisis when they discover Maya is growing up way too fast. Violet does the unthinkable.

Sam tries to take care of his sister, Corinne, but her mental condition makes that nearly impossible; Sheldon learns that Amelia has life-changing news; the flirtation between Addison and Jake continues, and Cooper rejects Charlotte's suggestion to seek outside help with Erica's care.

Violet's book launch party has finally arrived but Sheldon finds himself attracted to the doctor who criticized her book. A surrogate under Addison and Pete's care is caught in a complicated love triangle. Cooper and Sam must convince a family that their son's health must take a priority over his sports career.

Emotions are stirred up at the practice when Dell's daughter arrives; a pregnant woman experiences chronic pain.

Addison butts heads with a new oncologist (Cristian de la Fuente) while treating a newborn with a malignant tumor; Pete is uncomfortable when Violet tries to help a parolee.

Pete suspects that his brother Adam may be responsible for their mother's illness. Meanwhile, Violet discovers quite by chance that Sheldon is dating Marla Phillips, the doctor who panned her book, and who Violet considers as her archenemy. Cooper's patient is a musical prodigy with a debilitating brain tumor.

Addison's mother, Bizzy, aggressively demands her daughter do whatever it takes to save her partner from dying - including working with Dr. Rodriguez once again. Meanwhile Amelia and Pete's medical consultation is complicated when a patient's wife and his mistress disagree on the course of treatment, Charlotte and Cooper try to be intimate with each other again, and Violet considers publishing a personally-revealing book she's written.

Desperate to help his pregnant daughter, Mark (Eric Dane) follows Addison back to Oceanside Wellness, Dell and Naomi struggle to raise their children under the same roof, and Violet and Cooper heatedly disagree on how to treat a patient on.

Pete, Violet, Sam and Addison adjust to their new, singles lives in different ways. Addison questions how much she wants a baby and confides in Jake, Violet considers an offer to go on a date with a young, hot paramedic, and Sam and Pete have a bachelors' night at a local bar. Meanwhile, Charlotte faces a personal, ethical dilemma when Amelia uncovers a secret about Mason's mom, Erica, and Sheldon refuses to bend to the pressure when an old friend from the police force wants him to rubber stamp a fellow cop suffering from PTSD.

Charlotte tries to tempt Addison to come to St. Ambrose Hospital by promising her surgeries; Sam doubts his ability to save Oceanside Wellness from financial ruin; Pete's firefighter patient suffers an unusual form of post-traumatic stress disorder.

Charlotte and Cooper look to forgive each other after revealing secrets during couples therapy, Violet seeks the forgiveness and approval of her fellow doctors after they learn her novel-in-progress will make all of their personal lives public, Sheldon treats a patient who claims to have multiple personality disorder, and Sam and Naomi team up on a case involving a pregnant teen with Down's Syndrome.

Addison and Pete treat a recently married couple who are having sexual problems. Cooper is trying to figure out why four siblings are all suffering from the same mysterious illness. Maya tells Naomi she's been hoping her and Sam would divorce since she was in the third grade. Meanwhile, Violet is trying to convince a patient to leave her husband, even though, she is having trouble letting go of her ex-boyfriend who is now married.

Addison's brother, Archer, moves to Los Angeles to work at Pacific Wellcare; Cooper encourages Violet to discuss her pregnancy with Pete and Sheldon.

A husband's decision to pull the plug on his pregnant wife is overruled by a judge, forcing the hospital to keep her on life support until the fetuses she is carrying as a surrogate are able to survive. Meanwhile, Naomi feels betrayed after learning of Sam and Addison's feelings for one another, and she turns to Dr. Fife for support while William is away on business. And unable to cope with the tension, Addison takes the day off with Pete and Lucas.

Violet and Cooper make amendments to their friendship in order to please their significant others; Pete and Cooper get in an argument involving marijuana use by a patient (guest starring Justine Bateman as Sydney); Addison is conflicted about going public with her new romance, and Sheldon's decision to deny approval for a patient's sex change backfires.

Cooper receives the surprise of his life when a woman from his past arrives at the practice; Addison consults her patient, Jodi, who is eight and half months pregnant and suffering from severe memory loss after a traumatic car accident; and Sheldon and Violet clash when their patient, Jodi's husband, Zach, considers leaving his wife and taking the baby with him.

Katie Kent is apprehended and on trial. Violet is asked to testify against her attacker, but she struggles with whether or not she can face her attacker in court. Meanwhile a serious complication threatens the fetuses of two of Naomi's former patients and Charlotte is determined to convince Addison, Sam and Cooper to let her join Oceanside Wellness Group.

Naomi begs Fife to use his still experimental treatment to help William's advanced ALS. Violet and Amelia treat a woman with a brain tumor, while Sheldon decides to vie for Charlotte's affections.

Amelia’s drug addiction spins further out of control as she plays hooky from work with a new fling, starts writing pill prescriptions for herself, and has a run-in with the cops; Addison and Jake are at odds when they must make the impossible choice between donating their patient’s organs or saving the life of her healthy, unborn baby; Violet begins working at Seaside Wellness again, and Cooper, Charlotte and Mason begin to form a family bond, much to Erica’s chagrin.

When a patient's partner and father are heatedly divided on his health care, Pete makes a decision that impacts everyone, including himself; meanwhile, Jake offers strength and experience to Amelia when he suspects she's being tempted to substance abuse, Sheldon and Violet treat a family concerned about the father's new sexual appetite, and as baby Henry draws Addison and Sam closer, they struggle to define their relationship.