House and Cuddy are exploring the ramifications of those feelings and attempting to make a real relationship work. Meanwhile, due to a colleague's illness, Princeton Plainsboro is left without a neurosurgeon on site, threatening the hospital's accreditation as a Level 1 Trauma Center. As the team attempts treatment to get their sick colleague back to work, they discover there is more to the illness than they originally suspected and turn to House for direction. Instead, House remains elusive, leaving the team on its own.

A seemingly healthy 14-year-old girl collapses during a skateboarding exhibition; House and Cuddy face the challenge of handling their romantic relationship at work.

A children's novelist tries to kill herself, but is thwarted when she has a seizure. House, a fan of the books, puts her on psych hold but has to deal with a patient that is eager to die rather than be cured. Meanwhile, House worries that he'll lose Cuddy because they have nothing in common.

House and his team make unexpected discoveries about a female patient admitted to the hospital after severe and uncontrollable vomiting; House and Cuddy are forced to face the reservations in their relationship after a visit from a massage therapist.

When an infant suffers breathing trouble and liver failure, House and the team must look at the medical history of the mother in order to find an answer, and ultimately land on a discovery that forces the mother to jeopardize not only her child's health but her own. Meanwhile Taub and Foreman must find a new female doctor to fill the spot vacated by Thirteen and House and Wilson learn a thing or two about parenting while caring for Cuddy's daughter.

It’s election season, and in the midst of a tight campaign, an incumbent New Jersey senator’s campaign manager falls ill with liver failure and temporary paralysis. Cuddy pushes House to add a female doctor to his team by hiring brilliant third-year medical student Martha Masters in Thirteen’s absence. House and the team are wary of the young doctor’s lack of experience and medical perspective, but are forced to give their new by-the-book teammate a chance to prove herself. After the campaigning senator makes a surprising announcement, House and the team look to the candidate to find clues about the patient’s condition. Meanwhile, Foreman learns that Taub has a past connection to Masters, and in an effort to save his patient’s life, House must make a critical decision that may compromise his relationship with Cuddy.

After a 200-year-old medicine jar found on an off-shore shipwreck shatters in a teenage girl's palm, she is admitted to Princeton Plainsboro for symptoms closely linked to smallpox. When the Center for Disease Control's Dr. Dave Broda institutes a lockdown on the hospital and suspends House's team's ability to diagnose, Masters grows suspicious of Broda's motives and becomes convinced that the patient is suffering from a different disease. The girl's father soon experiences similar symptoms, and House is forced to make a precarious decision that puts his own life in jeopardy. Meanwhile, Wilson and Sam comfort a 6-year-old chemotherapy patient who prompts them to examine their relationship.

Science and faith are called into question when a patient is admitted to the hospital following his reenactment of the Crucifixion. Meanwhile, Taub questions his wife, Rachel, about her relationship with an infidelity support group member, and the team attends a co-worker's wedding where Wilson's relationship with Sam takes an unexpected turn.

After saving a stranger who fell onto subway tracks, a man suddenly collapses despite appearing to be unscathed; House tries to avoid a dinner with Cuddy and her opinionated mother.

House and the team try to link symptoms of a teenage military recruit and his drill sergeant; House secretly helps Cuddy's daughter get into a prestigious preschool; someone posted a disparaging photo of Chase on a social-networking site.

Cuddy’s mother, Arlene, is admitted to Princeton Plansboro after complaining about unusual symptoms, but stubborn Arlene insists that House be removed from the case, forcing House to come up with non-conventional – and illegal – means to treat his patient. House instructs his team to follow his lead, and they discover details in Arlene’s personal life that she kept secret from Cuddy and her sister Lucinda. Meanwhile, Taub’s ex-wife, Rachel, puts him in contact with her brother who hires Taub to work a job on the side in exchange for much-needed income, which winds up taking a physical and emotional toll on him. Later, Cuddy places her trust in House to ensure that her mother receives the proper medical treatment, leading “by the book” medical student Masters to reevaluate her responsibility to practice within a code of ethics and to follow her boss’ orders.

When a waitress with a perfect memory suffers temporary paralysis, her older sister visits her in the hospital, which triggers high stress levels and even more health complications. The patient’s sharp memory proves detrimental when a grudge she’s been holding against her sibling gets in the way of receiving proper medical treatment, and Masters discovers that patching a broken sisterhood may prove to be more complex than diagnosing the patient. Meanwhile, Foreman volunteers to help Taub prepare for a medical examination, while House, determined to help Wilson get back in the dating scene, discovers Wilson’s secret new companion.

House participates in a school’s Career Day and breaks a few rules by sharing explicit medical stories. Waiting outside the principal’s office, he meets two fifth-grade students who assess House’s relationship woes and try to help him understand how his selfish antics get in the way of showing Cuddy how he really feels.

A patient is admitted after breaking out in a severe rash triggered by caustic chemical exposure at his blue-collar job. As the team treats him, they discover that he has led his wife to believe that he is still maintaining his once-lucrative real estate career. Meanwhile, Cuddy is honored with an award and needs House to be at the charity event for support, but his attendance is threatened when his patient’s battle to survive forces him to question his practice and his own happiness, and Chase and Masters teach each other a lesson in forging meaningful personal and professional relationships.

Tension reaches new heights when Cuddy faces sobering news that propels her to reevaluate her priorities. While House is distracted by his concern for Cuddy’s well-being, the team treats a teenage patient whose worsening symptoms and suspicious body scars indicate more than just physical illness. Sensing the teen’s troubled emotional and mental state, Taub turns to the patient’s personal life for clues and uncovers disturbing home videos that could put the lives of his peers in danger. Meanwhile, Cuddy remains hopeful that House will be fully present when she needs him most, and a series of dreams, including a musical scene choreographed by Mia Michaels, provide glimpses into her life and her relationship with House.

The team treats a professional bull rider who is attacked by a bull. The team must determine the causes behind the patients disappearing symptoms and seizures while taking House's advice from outside the hospital as he attends to issues unrelated to the case. Meanwhile, Masters develops a crush on the patient.

A homeless man with a history of drug abuse is admitted to Princeton Plainsboro with burns and scars on his chest. Meanwhile, Cuddy reveals her guilt to Wilson about breaking up with House.

Thirteen has been in prison for the past year, but the real mystery for House is what she did to get there. At the hospital, the team treats a science teacher suffering from severe respiratory illness. Taub tries to get back into the dating scene, but winds up retreating to his old habits.

Masters faces a career crossroads on her last day as a medical student and struggles with the choice to continue on the path to become a surgeon or to accept the rare opportunity to join House’s team officially. Meanwhile, the team treats a 16-year-old girl who inexplicably collapsed days before embarking on an ambitious sailing tour around the globe. Despite the patient's life-changing diagnosis, the patient's family insists on getting her back on the seas in time for her potentially record-breaking launch. But to the team's surprise, including House, Masters makes a bold decision regarding the patient’s treatment.

The team takes on the case of a lottery winner (Donal Logue) suffering from paralysis and multiple types of cancer, and they must figure out if it his new millionaire lifestyle that is making him sick. Meanwhile, Cuddy's mother threatens to sue the hospital over her treatment, and Foreman and Chase make a bet over who is repressing the uglier side of their personality more.

After losing a bet with Wilson over a boxing match, House is convinced that his fighter has an underlying medical condition that cost him the fight. While he tries to prove it, he leaves his team alone to help a bomb scientist who suffered a seizure. Meanwhile, House may be experimenting with a new drug to help his leg pain.

When House discovers that the experimental drug he's been using causes fatal tumors, he decides to attempt to excise them himself. However, he can't complete the surgery and ends up needing Cuddy's help. Meanwhile, Thirteen's friend from prison (Amy Landecker), a relapsed drug user, arrives at her apartment needing medical care after being stabbed. With her friend unwilling to go to the hospital, Thirteen enlists Chase's assistance when the friend loses sensation and movement in her arm. Also, Taub receives some unexpected news that could change his life.

The team treats a performance artist (Shohreh Aghdashloo) who deliberately made herself ill with the aim of turning the diagnostics department into her new masterpiece, as House must decide which of her symptoms are real, and which are self-inflicted. As the case progresses, House vows to make changes in his life, but remains rooted in old habits. After the case is over, House finally deals with his anger over the breakup and lashes out by driving through Cuddy's dining room and escaping to a beach.