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Booth and Brennan investigate a gymnast's murder, but collecting the evidence is hindered by a lightning strike. Meanwhile, Booth is surprised and concerned by Brennan's rapport with the victim's father, and Cam faces her identity thief.
Brennan takes a vacation down to New Orleans to help identify victims of Hurricane Katrina. While at her hotel, she wakes up the next morning bloody and beaten, with no memory of what happened. Booth comes down to try and help her figure out what happened. When the local medical examiner is found murdered, Brennan becomes the suspect. Their investigation leads them into the world of voodoo.moreless
A mysterious young deaf girl is thought to have committed a recent murder after she's found on the streets, covered in blood and holding a knife. It's up to the Jeffersonian team to figure out who this girl is and determine if she's really the one to blame for the murder.moreless
Booth and Brennan's wedding is finally here, but a murder and family conspire to ruin the event. A body discovered while the wedding rehearsal takes place threatens to split Brennan's attention from the wedding, so Cam and Angela do their best to keep it from her until the case requires all of the team. Meanwhile, Max comes to town for the wedding, but the bag full of money he brings with him seems to indicate he has other duties than walking the bride down the aisle.moreless
The body of a woman found buried under a paintball field yields more questions than answers as the investigation into her death reveals even she didn't know who she was. On the domestic side, Booth and Brennan adjust to sharing space with each other … and her growing stomach.
The dismembered body parts of a Ship 'n' Print employee are found at a dead letter office, prompting the team to go in and investigate. A love triangle involving the victim complicates things. Meanwhile, Booth's grandfather reveals some shocking news to Booth.
The team investigates what appears to be a murder scene at a national monument, but the only clue left is a coded message made of human blood that will be the beginning of a scavenger hunt for the solution, courtesy of a new, technologically-proficient foe. Elsewhere, Booth and Brennan look for a new home.moreless
Booth and Brennan investigate the complicated case of a teenaged boy whose remains shine a light on a horrific school party involving an alleged rape and drugs, and family and friends who must face the reality of the victim's life. At the lab, Finn's involvement in a case full of falsehoods makes him revisit shielding Michelle from Cam.moreless
The body of a high school guidance counselor may be Brennan's ticket home, but first the team must determine if Christopher Pelant is still controlling events behind-the-scenes. Meanwhile, Brennan and her father manage to elude the feds, and the FBI puts the Jeffersonian under the microscope.
Christopher Pelant's appeal of his verdict goes to trial, and Booth and Brennan do everything they can to keep him behind bars. But a new murder with ties to Pelant that the team hopes will put him permanently in prison takes a nasty twist that puts Brennan's freedom in jeopardy.
Booth and Brennan investigate how a crime-scene cleaner's body washed to shore inside a sealed pod. Back at the lab, Angela and Hodgins discover Cam's been keeping a secret.
When a toy company executive is found shrink-wrapped with one of their Prince Charmington Dolls, the company's CEO gives Booth and Sweets access to the company's prototype lab, and Brennan's concern over her fitness as a mother causes her to integrate the case into her life. Elsewhere, Daisy supports Sweets' defiance of Booth in going after a gun certification.moreless
Special Agent Genny Shaw pitches in at the agency with Booth, while Brennan reduces her activities – sort of – on her first day back to work when the team is asked to solve the case of an extreme couponer who was dragged to her death by a big rig. Elsewhere, Cam is unhappy with Michelle's involvement with Finn.moreless
The body of a journalist found at a bio-waste facility turns out to be infected with a deadly virus. The urgency this adds to the team's investigation of the journalist's death is nothing compared to their desperation when someone at the Jeffersonian is infected, and the only way to devise a cure is to solve the murder.moreless
A competitive eating champion's body is found shortly before the next major competition. Following a disagreement over the baby, Booth and Brennan attempt a little role-playing. Back at the lab, Brennan's new assistant seems a mismatch, despite his genius.
The body of a "storm-chaser" found after a tornado leads the team to study weather patterns to try and solve the case. Elsewhere, a desperate Angela and Hodgins turn to her father for child-care assistance, and Brennan must cope with Booth's over-protectiveness.
When remains are discovered in the middle of the woods, the team is called in to determine the how and why this trucking company employee was murdered. Meanwhile, Hodgins has caught the shopping bug, and seems to think he has an unlimited budget, as he augments his lab with high-tech toys. At home, Booth copes with Parker's return from England and the realization he's no longer an "only."moreless
The team investigates a man who should be dead from a bomb explosion, but whom they find living with his wife when they come to notify her of her loss. Meanwhile, Sweets breaks in a new partner from the FBI.
A blue corpse discovered at a landfill inspires squint Vaziri's creative side in a scientific way. His results send the team to investigate a hair salon and its inhabitants. Meanwhile, Booth plans something special for Brennan, who is unhappy with her post-partum physique.
Brennan, intrigued by Phil Jackson's management style, pulls all her interns together as a team for a project worthy of the basketball coach's philosophy. She charges them with identifying remains that have been determined unidentifiable. For the team, however, it turns out that naming the bodies may be the easiest part of their task when one of them is from 9/11 and they must decide if he is a victim or perpetrator.moreless
The charred remains of a discharged Marine finds the team investigating a group who actively prepare for the apocalypse. Elsewhere, Booth and Brennan have mixed feelings when Sweets finally locates an apartment to rent.
Human remains in a school cafeteria's stew challenge the Jeffersonian team to not only identify the victim and killer, but immerse themselves in the food industry and its cutthroat practices. Elsewhere, Angela throws Brennan a belated bachelorette party that gets a little Angela-like.
The crew heads out to LA to work on a film called "Bone of Contention" which is based on Brennan's most recent book; when Brennan finds out that the film lacks authenticity she intervenes to bring it up to snuff; but when a prop body turns out to be an actual murder victim the team must stop working on the film and work the case instead; Booth is also offered a job.moreless
Brennan's reliance on pure logic is challenged when she convinces the jury on which she is serving to acquit the accused murderer. When the man's closest friend is subsequently murdered, Brennan tasks the team to uncover the real killer, even if it means proving her wrong.
Angela and Hodgins wake up to find a corpse dangling in the canopy of their bed and they soon discover that it was planned by Pelant, who has come back for revenge. Hodgins wants to go after him head on, but Booth tries to convince him that he should work within the system. Later, the Jeffersonian team discovers that the corpse belongs to a Special Forces agent who worked for the largest supplier of mercenaries and Angela and Hodgins decide to start an investigation of their own without the help of the team to protect their family.moreless
Booth is not happy when Brennan, in her advanced state of pregnancy, decides she is the only scientist who can solve the mystery of a prisoner's corpse found miles from the prison in the sewer system. Unfortunately, her determination to work as usual puts them in danger and results in a surprise arrival in a location only Brennan can appreciate.moreless
Booth and Brennan investigate two corpses found at the same burial site. The identifications reveal one was a terminal patient and the other her doula, hired to help her process her diagnosis and the end of her life. Booth and Brennan confront the different choices they might make in the same place. Back at the lab, Daisy returns, and her usual cataclysmic awkwardness is overlaid with a little bit extra as this is the first time she and Sweets have worked together since the break-up.moreless
Brennan's newest intern matches her intellectually, but his take on the evidence challenges her to stray from the scientific straight and narrow. Booth, meanwhile, worries her openness to borderline theories may affect his murder investigation.
Another body is discovered in the woods. This time the investigation reveals the victim was part of a Hatfield-McCoy-type battle between two families. At home, Brennan's reluctance to accept her father's babysitting services means she must delve into her own family history to understand her feelings.
Things are busy at the lab as the team deals with outside concerns while it tries to find a TV producer's murderer. Hodgins dons a molecular gastronomy cap when he attempts to break Finn's hot sauce recipe using his lab equipment, and Christine's misbehavior means Brennan must entertain the possibility her daughter will not be exceptional.moreless
A street artist who fell into his own glue while converting a billboard poses a challenge to the team when part of a dead comedian's body in his glue gets stuck on him. Booth goes undercover at a comedy club to identify suspects, and Angela is drawn to the artist.
The dismembered body of a roller derby skater means Angela goes undercover at the rink to find more clues to the woman's murder. Elsewhere, Cam worries over the sheer number of doctor appointments Booth is going to, and presses him for details.
Booth and Brennan investigate the murder of a famous divorce attorney who was in the midst of his own divorce. Unfortunately, the interviews highlight their own relationship struggles after three months apart.
Booth and Brennan look into the death of an undercover cop after his body is found with diamonds inside his body. Their investigation must determine whether the man's time undercover turned him, or the ATM thieves he had infiltrated set him up. Back at the lab, Brennan is volunteered for a documentary of the Jeffersonian made for fund raising. First, though, she must find a way to be likable on film.moreless
The team investigates when a stock brokerwho moonlights as a stripperis murdered. Elsewhere, Booth must cope with a request from his mother who has reappeared after a 24-year absence.
The team is called to identify a woman's mutilated body after it is dumped in a city garbage can. Brennan has difficulty keeping her home and work lives separate after Booth takes pity on Sweets and invites him to stay with them until he has his own place again.
Booth and Brennan look into the murder of a Sierra Leone immigrant whose body was found at a hazardous waste facility stuffed in a barrel. At the lab, Cam and Arastoo's involvement is on the verge of discovery, while Booth and Brennan plan a vacation.
In the fourth season finale, a murdered body is discovered at a popular nightclub called "The Lab." The Jeffersonian team takes on unusual roles, including the nightclub staff and law enforcement, in this dream-world episode.
The team investigates a body found in an air conditioning vent. When Booth discovers a familiar CIA agent at the victim's home, however, he knows there's more to the Department of State accountant than he realized. Elsewhere, Booth reaches out to a former priest to help him make sense of the chaos Pelant wreaked in his life, and Brennan deals with her disappointment and its effect on her relationship with Booth.moreless
A management consultant's body is found, but the crime scene had been contaminated by bobcats. Evidence leads the team to a marriage retreat, so Booth and Brennan don old undercover identities to determine the killer. Elsewhere, Cam runs up against the law in a case of stolen identity, and Sweets makes a personal decision that will affect his career.moreless
A plot to draw out Pelant requires intricate planning and a donation. Pelant, however, is already three moves ahead of the team, and Sweets suspects a member of betrayal.
Booth and Brennan investigate the charred remains of a gang member that were found in a burned-out car, and Sweets takes time off from his sabbatical to help out when it turns out the man's son is someone he knows.
Booth and Brennan choose mystery over a traditional honeymoon when they help a detective in Buenos Aires—one of Brennan's fans—with his murder investigation. Back home, Angela and Hodgins have their own troubles taking care of Christine.
Booth and Brennan investigate a high school principal's murder, only to find that his terminal diagnosis spawned a second online career that provided inspiration to the paying masses, and one of the videos offers a clue. Elsewhere, Sweets faces a digital evolution that threatens his job, and Booth and Brennan have plans of their own to make.moreless
Booth and Brennan investigate the murder of a sperm donor, but lies he told increase the suspect pool exponentially. Back at the lab, Hodgins discovers unknown nurturing instincts when one of his specimens finds unusual lodging. Elsewhere, Brennan attempts to dampen her blunt side in favor of playing the publicity game when she is challenged by another author.moreless
Booth and Brennan dust off their dancing shoes when they go undercover as contestants in a ballroom dancing competition while investigating the murder of a dancer murdered just days before her audition for the show.
The investigation into the mauled body of a day laborer at an animal expo leads the team to an animal trafficking operation, the operator of which is also the owner of the expo. Elsewhere, Brennan looks at a political career, while Sweets and Daisy face a major change in their relationship.moreless
A famous archaeologist who can't get published is murdered just as he discovers a career-restoring find, and the Jeffersonian team is tasked with the investigation.
Brennan's late work day has disastrous results when she is shot by someone at the lab and the team's investigation reveals the shooter has a connection to the Jeffersonian. Meanwhile, at the hospital, Brennan struggles to reconcile the illogical visions of her mother with her absolute belief in science and reasoning.moreless
Pelant has returned to play more mind games with the Jeffersonian team and has made Booth his new target.
While investigating a boy's murder, the team allows Avalon Harmonia access to the body after she claims the boy's soul hasn't passed on. Avalon's work causes the scientists to reexamine what they believe about life after death.