Pilot episode. After returning to Washington, D.C., renowned forensic anthropologist Dr. Temperance Brennan is called in by FBI Special Agent Seeley Booth to aid an FBI investigation involving a set of bones found hidden in a lake.

When a man is killed driving an SUV registered to a Middle Eastern man, Dr. Brennan and her team find themselves tracking a terrorist.

When the decaying corpse of the Venezuelan Ambassador's son is found hanging from a tree on the campus of an exclusive private school, a simple suicide case quickly turns into a web of lies, sex and scandal involving the school's staff and students.

Brennan and Booth travel to Washington to investigate a human arm that was found in the stomach of a black bear.

Booth asks Brennan to help locate and identify the remains of a six-year-old boy, Charlie, who went missing from a local park.

When Brennan and Angela get caught in a fight in a dance club, Brennan kicks someone into a wall, which causes the wall to break open and reveal a mummified corpse and a meth stash.

A death row inmate asks for Booth's help to prove his innocence before he is scheduled to be executed. Booth agrees and asks Brennan and her team to help him out.

Brennan is about to go out for dinner with her old professor and ex-lover when Booth asks her and her team to help identify the remains of a young woman found in a refrigerator.

Brennan and her team are brought in to identify the body of a man found in a fallout shelter. While cutting into the bones of the man, Zach accidentally releases a deadly fungus, causing the team to be quarantined over Christmas.

Brennan and Booth investigate the body parts of a woman found near L.A. International Airport. Their investigation is slowed due to extensive cosmetic surgery the victim had done.

When a woman’s burned body is found in a car with signs that her child was kidnapped, Brennan and Booth suspect the father, Carl Decker. But things get complicated when Decker turns out to be in the Witness Protection program.

Brennan and Booth investigate the origins of a decomposed body that's been found in a local alley and determine it's the remains of a shy teen with an alter ego.

Booth and Brennan investigate when a dug up corpse is found in the back of a gang member's car. While being questioned, a drive-by shooting allows him to escape. Booth and Brennan follow the clues, which lead them to an empty grave and another body in a grave at a wealthy senator's house, where the gang member used to work.

Brennan and Zach investigate a small jet crash that was carrying some Chinese diplomats and a woman. At the crash site, Brennan finds some bone fragments that do not belong to any of the passengers, but might belong to a man who has been missing for five years. Although ordered to work only on the diplomats, Brennan and her team go rogue to try to discover the identity of the extra bones.

When Brennan decides to give online dating a try, she ends up the target of a shooting at the local restaurant where she's meeting her date. The resulting investigation reveals that the shooter could be connected to either of the two cases she's currently working on.

Brennan and Booth stumble upon a subterranean world of homeless people when they find the remains of a filmmaker in the ventilation shaft of an underground tunnel.

While on vacation, Angela's boyfriend goes missing . When a skull shows up, she asks Brennan for help in identification, concerned it might be her boyfriend or the female guide who went missing with him. The investigation leads the team to a violent boyfriend, the local sheriff and ultimately to a counterfeiting ring setup in the desert.

A human finger bone found in the clutches of a drowning victim leads to a search for buried treasure.

A trip to New Orleans leaves Bones beaten, bloodied, and suspected of murder while plunged into the world of voodoo.

The team helps Deputy Director Sam Cullen's daughter, Amy, when she contracts a rare form of lung cancer after receiving a bone graft. Booth and Brennan learn she is not the only victim with this rare form of cancer.

Brennan and Booth investigate an apparent suicide in Arlington National Cemetery, but soon discover it is a murder linked to a military cover-up.

Brennan receives some bones to identify, but is stunned when she discovers that the remains are those of her mother who disappeared when she was 15 years old. The determined date of her mother's death leaves Bones confused and angry.

A train carrying a popular Senator is derailed by a car positioned on the tracks. Brennan works out why the dead body of a rich businessman was placed in the car, and the search continues for her father. The team has a new boss.

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.

When the body of a young man, who's been missing for nearly three weeks, is discovered, the investigation leads them to his girlfriend, who is a foster child. Bones becomes emotionally involved in the case since, she too, became a foster child after her parents disappeared.

After digging up the skeletal remains of a young girl, the investigation points to a convicted serial killer on death row. The team follows cryptic clues that lead to another body, an accomplice, and a victim who may still be alive.

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.

Booth and Brennan investigate a death due to an explosion in a Miami hotel. The clues lead to foreign diplomats with diplomatic immunity.

The team investigates the death of a 10-year-old beauty pageant star. The other contestants, their parents, and their siblings all become possible suspects. Hodgins and Angela go on a date that actually goes well, despite what everyone else predicted.

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.

The bodies of twin boys, kidnapped five years earlier, are discovered. The investigation lead Booth and Brennan to a notorious kidnapper known as the Grave Digger. During the investigation, Brennan and Hodgins become the Grave Digger's next victims.

While investigating the death of a film student who was working on a documentary about the legend of a headless witch who haunted the woods in the 1700s, Brennan develops a strong bond with the victim's brother.

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.

The notorious serial killer, Howard Epps, sets his prison cell on fire as part of a daring prison escape. Brennan is his target and her entire team is placed in danger.

Brennan has to work with another agent while Booth needs to see a therapist. The duo investigate the death of a college freshman, who took part in a 'Girls Gone Wild' type of video.

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 have to solve three murders that are identical to the murders in Brennan's new bestselling book.

The team investigate the death of an Asian woman found without any bones left in her body.

A broken water main uproots multiple coffins in an old graveyard. When the team is brought in to identify the bodies for re-interment, they discover a newer skeleton that should not be in the graveyard, which has not been used for 50 years.

Booth and Brennan investigate the case of a partial skeleton found in cement. Booth thinks a member of a crime family is responsible.

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.

The team investigate a glowing body. Hodgins proposes to Angela -- several times.

When Angela draws the face of an old woman to go with the decomposed skeleton of someone much younger, they soon learn the victim had Progeria, an aging disease. Booth and Brennan investigate to discover who would want to kill such a fragile person. Meanwhile, Hodgins and Angela's walk down the aisle doesn't go as planned.

After a skull smashes into the windshield of a teenager's car, the investigation reveals the skull has been gnawed on by human teeth, which implies cannibalism and marks the beginning of the Widow's Son case. Meanwhile, Angela and Hodgins hire a private investigator to find her husband. Bones searches for Zach's replacement and the team gets a wonderful surprise.

Brennan and Booth investigate the death of a soccer mom who was blown up in her mini-van. They soon discover that the victim was part of a group of radicals from the 70's, adding several names to the list of possible suspects.

Things get kinky when Booth and Brennan follow murder clues that lead to a lodge used as an S&M retreat for "jockeys" and their "horses." Meanwhile, Angela tries hypnosis in an effort to figure out her elusive husband's name so she can finally divorce him.

When a body that appears to be cooked is discovered, the clues lead Booth and Bones to an organic farm co-op. Meanwhile, the two of them must meet with Lance Sweets, an FBI psychologist who must determine if they should continue to work together.

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.

The team suspect their own colleagues after the burnt remains of an intern at the Jeffersonian are discovered. Meanwhile, Booth poses as Cam's boyfriend at her family get-together.

On the 20th anniversary, the Foothill High School, class of '87 alumni unearth the time capsule they buried to discover the remains of one of their classmates inside. Booth and Bones investigate the past lives of his classmates in an effort to discover the truth.

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

Booth and Brennan investigate a mall Santa named Kris Kringle who was found dead by two elves. A series of clues makes the murdered mall Santa seem like he's the real deal.

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.

All team members are working to identify the bones from a college athlete who suffered a lot of fractures. After the body is identified they talk to his sister and somebody who acted as a sort of an adviser for the deceased. Angela and Hodgins have an important talk. Zack is overwhelmed by having to reconstruct the crushed bones to form a skeleton.

A woman's car is run off the road and she is killed, but her baby miraculously survives the accident. Booth and Brennan go to the woman's hometown to try to find out who's responsible for running her car off the road. Bones, with help from Booth, takes care of the baby until the team finds out who killed the mother.

Brennan's father Max Keenan is on trial for the alleged murder of FBI Deputy Director Kirby. Everyone on the team, except for Brennan, is called as a witness for the prosecution during the trial. Brennan on the other hand is the forensics advisor for the defense, and she must rely on both her dedication to her family and her skill as an anthropologist to help free her father.

A wannabe singer Tommy Sour was found on a grassy location. The investigation leads Brennan, Booth, and Cam to the Checker Box Restaurant where Tommy used to sing. There are several suspects who took part in the open mike contest there, with talent scouts in the audience. The group comes together with a startling revelation for Brennan.

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.

The body of the host of a popular reality TV show is found partially decomposed in an outhouse, and Booth and Brennan must find out who the killer is. Meanwhile, Booth learns that Brennan is juggling two relationships.

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.

The remains of a despised office manager are discovered in an elevator shaft, and Booth and Brennan must figure out which employee killed him. After some investigating, they find that the manager had more than a fair share of complaints on file. Meanwhile, Angela and Hodgins try to make peace in the lab after their break-up.

Booth and Brennan go to investigate a body found in the Chesapeake Bay. After arriving, they find only the upper torso, giving the team little to work with other than remnants of the victim's breast implants. Brennan and Booth are led to a small church in Maryland, where they find that the victim was a pastor. When the team finds the lower half of the body, they learn that their initial assumptions may not been incorrect.