A bus accident leaves House with serious head trauma and partial amnesia. He comes to believe that a patient on the bus had a life-threatening disease and struggles to recall who it was, and what they had.

In the aftermath of the bus accident, House struggles with his head injuries and short-term memory loss, and must deal with a concerned Wilson who believes his friend's health may be in danger.

House must decide whether to take the case of his ex-love's husband and he gives medical students a lecture they'll never forget.

House and the team are intrigued by Scott, a man whose left brain and right brain operate independently, leaving him with two distinct personalities and no control over some of his actions. As the two sides of Scott’s brain struggle for dominance, his warring personalities make it increasingly difficult for the team to figure out what is causing the unique problem. The team is forced to use some unusual methods to get him to cooperate with their necessary testing. Meanwhile, when House refuses to make an appearance in the clinic, Cuddy takes an unconventional approach to force House to make up the time with a particular patient.

House is detoxing at a mental hospital and being held against his will by his attending physician, so he concocts an escape plan, aided by his roommate and a visitor named Lydia.

Cuddy, House and members of the team join forces with a search-and-rescue team to provide much-needed medical attention at the scene of an emergency.

House is shot by a former patient and must share a recovery room with the gunman.

Facing a 6-month jail term, and the realization that he won't be there for Wilson at the end, House finds himself examining his entire life while contemplating a dismal future without his best friend.

Foreman continues to experience the same progression of symptoms as the police officer. When he realizes he may be facing imminent death, he calls his father who comes to his son's side. As it comes down to a race against time, House believes the solution to the illness is in the police officer's apartment.

House and the team take on the case of a ballerina whose lungs collapse in the middle of a performance. When the treatment causes her skin to fall off, the dancer faces not only the prospect of never dancing again but also of dying an agonizing death. The team must use their imaginations to carefully choreograph ways to test and treat her delicate body without killing her. Meanwhile, House continues to suffer from what he thinks is insomnia, and he is willing to go to desperate measures to cure it.

A girl's unimaginable bravery toward her terminal illness makes House suspicious as he puts a life-or-death decision about her case in her young hands.

House and his team have to diagnose a case at a distance when a researcher at a South Pole base is taken ill.

A man awakens in New York after a bicycle accident unable to move or communicate in any way. House, himself injured in a motorcycle mishap, occupies the hospital bed next to Lee and quickly annoys the doctors treating them both by insisting that Lee has “locked-in” syndrome.

Charlotte, an older woman who has spent the last six months taking care of her dying husband Eddie, is rushed to Princeton Plainsboro after collapsing from respiratory failure. The couple becomes a double mystery for the team when Eddie begins to improve as Charlotte’s condition worsens. The previously unthinkable becomes real when it seems that Charlotte will die before Eddie, and the team will be forced to make a difficult decision.

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.

House and his team are placed under review after a staff member gets hurt.

When a police officer with a gunshot wound to the head and uncontrollable laughter is admitted, House and the team are baffled. When Foreman begins showing the same symptoms, they race to determine the cause of the illness before Foreman's condition takes the same path.

While House is forced to work full-time in the clinic and deal with a rape victim who insists on confiding with him, Cameron deals with a terminal cancer patient trying to take advantage of her state of mind.

House encounters a brain-damaged musical prodigy with inexplicable abilities while the team faces serious concerns about House's own health.

The team takes on the case of a deaf 14-year-old named Seth who collapsed after he started “hearing” explosions while competing in a wrestling match. When the team tries to test him for seizures, Seth loses vision in one eye, complicating House’s bunk theory of “Exploding Head Syndrome.” As his condition worsens, the team has an ethical disagreement about the patient and his mother’s adamant decision to forego cochlear implants to supplement his hearing. When the prospect of giving Seth the ability to hear for the first time in his life arises, House and the team are faced with a resounding decision. Meanwhile, House’s lack of sleep starts to play tricks on his mind, but he finds his insomnia may be a gift instead of a burden

When House and Wilson disappear off the grid for several days, without explanation, the team is left to deal with a difficult case concerning a 6-year old with numerous problems and complications, including an overbearing mother who also happens to be her physician.

The team takes on the case of Derrick, a 19-year-old college student who had a mysterious nose bleed during cheerleading practice, and discovers that his health issues are likely both physiological and psychological. Possibly suffering from schizophrenia, Derrick claims to hear his deceased brother’s voice in his head. Meanwhile, Foreman tries a different approach with House.

When a six-year-old boy is brought in with the same symptoms as another patient who died years ago under House's care, House believes the cases are identical and he can predict the course of the boy's illness. Meanwhile, the clinic hosts a poker night to benefit the oncology department.

When doctors are unable to diagnose why a severely autistic boy screams loudly for no apparent reason, House takes the case. As the boy's condition worsens, it becomes obvious that House relates to the boy because he has no social niceties.

On House and Cuddy's flight from Singapore a passenger gets ill and Cuddy suspects an epidemic. At the hospital, Wilson leads the team as they deal with a middle-aged woman suffering from seizures.