When the remains of a young pregnant woman and fetus are found in the Delaware Bay and identified as a newlywed who disappeared a year earlier, the investigation is aimed toward her husband, but takes a surprising turn. Booth is upset that his ex-girlfriend is letting their son spend time with her new boyfriend.

There are two suspects with the same motive when Booth and Brennan investigate the murder of a man found in a bathtub full of chemicals. They soon discover that he had two wives and a girlfriend.

When the skeletal remains of a federal prosecutor who disappeared five years earlier are found in the desert outside Las Vegas, the team suspects it to be tied to the mob. Booth and Brennan go undercover as Vegas high-rollers in an attempt to uncover the mystery, Booth risks his life.

Booth and Brennan are called to the scene where a man's body was found hung like a scarecrow, gutted, and burned on the roof of a building used by the FBI to hide witnesses.

Booth and Brennan investigate the death of Terence Bancroft, one of the Jeffersonian's major donors, found dead at his home. Hodgins' relationship with the wife of the deceased years earlier, compromises the case.

Brennan and Booth are called to the scene where a dead man has been found in a crater. The investigation leads them to the National Space Agency.

On Halloween, two mummified bodies are discovered and found to be people reported missing the past two Halloweens. When Booth and Bones learn about a missing girl, linked to the suspect of the previous murders, the race is on to save her life.

After the body of an archbishop is found, missing the kneecaps, the team concludes the murder is related to the Widow's Son case.

A body discovered in a hot spring turns out to be that of Tripp Goddard, a sexy motorcycle racer who had disappeared two weeks earlier. Sweets talks Booth and Bones into going out with him and his girlfriend.

The Gormogon serial killer is back again, and the silver skeleton from the basement vault has gone missing. All the Jeffersonian employees become suspects, with the scary possibility that one of their own is working with Gormogon.

Season four begins all the way in England, with Booth speaking at Scotland Yard and Brennan guest-lecturing at the prestigious Oxford University. Knowing of Booth and Brennan's expertise in their respective fields, local officials ask for their help with a high-profile murder investigation that involves a British heiress.

With the case of the murdered heiress solved, Booth and Brennan prepare to head back home, but are shocked to learn of another murder - and this time it's someone they know. Meanwhile, with Birimbau unexpectedly coming back into Angela's life, things get complicated between her and Hodgins.

Parker, Booth's son, discovers a corpse's finger in a bird's nest, causing the team to launch an investigation to try to find the rest of the body. After finding the corpse, the team discovers that the death was caused by a dog, leading them to an illegal dog fighting ring and a search for the killer dog and its owner.

When the smashed remains of a well known artist are found in an impounded junkyard car, Booth and Brennan are on the case to find out if foul play is to blame for his death. With suspects ranging from the artist’s rival to his own assistant, the team must race

against the clock to find evidence of murder before the car is relinquished and put on exhibit as the sculptor’s ultimate display of self-sacrifice for the sake of his art.

A shallow grave holds the remains of conjoined twins; Booth and Brennan infiltrate a circus community after they discover that the twins were jugglers there.

The team investigates a sci-fi convention when a woman in a medieval princess dress is found murdered. With Booth's back injured, Agent Payton Perotta steps in once again to help

When the half-eaten body of Cam's former fiancee is found in the tiger cage at the zoo, Booth and Brennan uncover that his death was far from accidental. Now the team must put the pieces of the fiancee's final day back together, including hypnotizing a suspect in order to spark his memory.

When it is discovered that a stage prop used by a Norwegian death metal band is in fact a real human skeleton, the remains are sent to the Jeffersonian when authorities determine the victim was an American citizen.

When a human body is found inside the strung up Otter mascot uniform of a rival school, Brennan and Booth investigate whether the body inside the costume was dead beforehand, or killed during a Middlesex University bonfire event. The body is identified as Jimmy “Beaver” Bouvier, a fraternity brother at Middlesex University. When Brennan and Booth question his fraternity brothers, they learn that Beaver had a money-making operation on the side and was making a killing of his own. Meanwhile, Booth offers to help his brother Jared find a new job after being dishonorably discharged from the Navy.

It's been six weeks since Booth and Brennan have seen each other. Booth has been recovering from brain surgery, and Brennan has been on a dig in Guatemala. Angela's psychic, Avalon Harmonia reveals while reading Angela's tarot cards that there are multiple bodies buried under a Washington,DC fountain. Angela shares the information with Brennan and Booth, but they're both a little skeptical. The lead pans out, and the duo find the remains of 11 bodies exactly where the psychic said they would be. Meanwhile, Sweets has certified Booth mentally fit to return to duty after his brain surgery, but Booth is still experiencing some side effects from the coma.

Brennan and Booth investigate human remains found at a neighborhood block party. Suburban politics and secret scandals give each neighbor in the cul-de-sac a motive, leaving Brennan, Booth and Sweets to sift through the drama to find their suspect. Meanwhile, Jeffersonian intern Arastoo comes clean about his background, and Booth's son attempts to find Booth a girlfriend.

Stephen Fry returns as Dr. Gordon Wyatt. Booth, still suffering some lingering effects from his brain surgery, has to get re-certified for FBI marksmanship, but is not the accurate shot he was before going under the knife. He and Brennan investigate the death of a little person who was a former wrestling star.

When a man dressed as Santa Claus blows himself up during a botched bank robbery, Brennan and Booth work to identify the bomber and determine his motives. Meanwhile, Brennan makes plans to spend Christmas in El Salvador, but her father convinces her to spend the holidays with him and Margaret Whitesell, a newly discovered distant relative.

When a human skeleton is discovered in the trenches of an old Civil War battleground, Brennan and Booth are called to the case. Despite the historical location, Brennan quickly identifies the bones as belonging to Dan Pinard, a present-day local dentist. While Booth investigates suspects, including the victim’s former boyfriend, Hodgins and lab intern Vincent Nigel-Murray work doggedly to clean the bones of a stubborn clay residue which is preventing the team from determining a cause of death. Meanwhile, Booth’s brother, Jared, returns from his travels with some suprising news.

When Dr. Sweets' book gets published, both Booth and Brennan read it and tell him about the first time they met: 6 years ago. The episode will give a new perspective on Booth and Brennan's relationship, and will also give viewers the chance to see Zack Addy again, and Dr Saroyan as a New York Coroner.

Booth and Brennan investigate a death at a rock-n-roll fantasy camp where the murder weapon is a Gibson ‘57 Les Paul “Black Beauty.”

The team works to uncover clues buried under a life’s worth of possessions saved by a hoarder in order to solve the mystery of his death. Meanwhile, Angela’s father has a specific purpose for his most recent visit, and Brennan and Booth are confronted with unique opportunities.

When Booth and Brennan are called to investigate decomposed remains found at the Jersey Shore, the team IDs the victim as Richie “The V” Genaro, a 23-year-old who partied the night before at a popular nightclub. Booth and Brennan question Genaro’s peers and the club bouncer, and Brennan surprisingly proves her pop culture savvy and anthropological expertise after watching what she believes to be a documentary on the inhabitants of the Jersey Shore, but was in actuality a reality show set there. Meanwhile, at the lab, the team grows fond of Booth’s girlfriend, Hannah, and Angela tries to keep her pregnancy a secret.

The past and present collide when human remains from a 150-year-old slave ship, the Amelia Rose, surface. The team is tasked to give the deceased a proper burial but make an unforeseen discovery linked to a recent murder. In the course of the investigation, Booth and Brennan are led to a different kind of ship - a "Cougar" cruise - where they learn their victim was seen moments before his death. Meanwhile, Sweets struggles to maintain a casual relationship with Daisy, and Cam discovers a surprising and emotional connection to the Amelia Rose.

Booth and Brennan’s next case leads them to a crime scene where a human carcass has literally melted into the dashboard of a charred truck. As the team investigates the case, they discover a gunshot wound in the victim, but learn that neither the fire nor the bullet was the cause of the victim’s death. Additional clues lead them to a local high school where the victim’s wife is a teacher. As a student-teacher relationship begins to surface and a pattern takes shape in the lab, the team is able to track down the murder weapon and solve the crime. Meanwhile, Sweets resists the temptation of allowing his feelings for Daisy to interfere with helping her pass a government psychological evaluation, and Hannah attempts to break the ice and warm up to Booth’s son Parker.

A body disguised as a scarecrow is found with a bullet wound in a remote cornfield, and the team is forced to work against the clock to avoid a storm and potential complications that would affect the evidence. Booth and Brennan interrogate the victim's three wives, who are also sisters, and learn that jealousy between the sisters and their desire for their husband's attention had caused a major rift in the family. Booth and Brennan also question one relative who disapproved of the victim's polygamy. Meanwhile, Cam loses confidence in her relationship with her on-call doctor boyfriend, but they both realize they need to make their relationship a priority.

Sniper Jacob Broadsky takes out a victim who escaped from the justice system; Booth uses his military training to try to stop Broadsky before he strikes again; Angela's father visits the Jeffersonian.

The remains of a mythbuster television show host are found in the wilderness appearing to have been killed by the mythic Chupacabra, a reptile-mammal hybrid creature whose existence has not been confirmed. The team soon learns that the victim traveled to the remote West Virginian area to debunk the Chupacabra myth, and they interrogate possible suspects, including a rival wilderness-channel host/cryptozoologist/pet psychic. But when a tape is recovered at the crime scene and peculiar tooth marks are found in the victim's remains, the team learns details about the victim's demise that challenge the original theories surrounding his death. Meanwhile, recovering alcoholic squint Vincent Nigel-Murray makes amends with each member of the team and makes some surprising confessions.

Rogue sniper Jacob Broadsky returns once again, claiming another victim and making Booth determined to put him away once and for all.

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 team discovers the remains of a so-called "storm chaser" who seems to have died while following a tornado. But footage recorded during the storm ultimately leads them to believe he was murdered. Meanwhile, Booth becomes increasingly overprotective of Brennan both at home and in the field, and sleep-deprived Angela and Hodgins come to terms with having Angela's father and rock musician babysit their infant son.

With the help of Special Agent Genny Shaw, the Jeffersonian team identifies the remains of a discount shopper and “extreme couponer” who was dragged along the road by an 18-wheeler. Meanwhile, Brennan is adjusting to her first day back at work after giving birth, and Cam disapproves of her daughter’s romance with intern Finn Abernathy.

When a corpse is found in the middle of the woods, the team links the victim to two families that have been feuding for almost a century. Brennan and Booth interrogate a family member with a shocking confession that leads them to a motive for the victim’s murder. Meanwhile, Brennan has a difficult time accepting her father’s offer to babysit their infant daughter because of his unpredictable presence in her own childhood.

The team's investigation of the death of an animal expo worker leads them into the shady market for illegal animal trading. Meanwhile, Brennan considers her political aspirations; and Sweets and Daisy confront a change in their relationship.

Brennan's new fascination with basketball and legendary coach Phil Jackson's thoughts on teamwork prompts her to gather five of her best "squinterns" to analyze remains that have never been identified.

A psychic joins the investigation of a death of a little boy whose soul is believed to be still alive, prompting the team members to reflect on their beliefs of life after death.

The Jeffersonian team investigates the death of a professional ballroom dancer who was murdered three days before her audition on a popular dancing competition show. In order to solve the case, Brennan and Booth go undercover as dance competitors to see if they can find potential suspects.

After Hodgins and Angela are drugged and wake up to a bloody corpse hanging in the canopy of their bed and flower petals around their son Michael's crib, they are forced to believe that Pelant is back for revenge against Hodgins. Although Hodgins wants to go after Pelant directly, Booth knows it's best to work within the system and not go against protocol. Meanwhile, as the Jeffersonian team investigates the corpse, they discover the victim was a Special Forces agent working for the world's biggest supplier of mercenaries, and Angela and Hodgins decide to start an investigation without the rest of the Jeffersonian team for the sake of their family.

The Jeffersonian team investigates the remains of a 15-year-old boy. Although his mother and few close friends saw him as intelligent with poor social skills, the team discovers that this seemingly innocent boy was actually involved in illegal activity and had attended a high school party two weeks prior where drugs were present. The investigation takes an ugly turn when an underage girl confesses to being raped and the deceased boy’s reputation is compromised. Meanwhile, with the case’s spotlight on deception, intern Finn Abernathy contemplates telling Cam that her daughter Michelle is in town visiting for the weekend.

When the Jeffersonian team investigates the death of a former Marine sergeant whose remains were found burned to a crisp, they discover that she was discharged after a fist fight with another Marine. When Booth and Sweets go to question the other Marine involved in the altercation, they learn that Deanna was obsessed with the idea of the apocalypse, which leads the team to a following of doomsday preppers who become key suspects in her death. Meanwhile, Sweets thinks he has landed his dream apartment but Brennan and Booth are not convinced that he will actually move out.

The Jeffersonian team investigates the murder of Jack Spindler, a successful employee at a brokerage firm by day, but a stripper by night. When the team learns how Spindler's moonlighting affected his personal life, they start to question the people closest to him, including his stripper friend, Storm. Meanwhile, Booth's mother shows up after a 24-year absence in his life and makes a special request of him.

The team suspects that a man who made his money donating sperm was killed by a recipient who learned his records were inaccurate; Brennan enters a feud with a fellow author (Nora Dunn).