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 Jeffersonian team is called in to solve the murder of a wine critic who was found inside a wine barrel. Meanwhile, after deciding that she wants to have a baby, Brennan shocks Booth by asking him to be the father of her child. Booth can't stop thinking about Brennan's request. His stress, along with an undiagnosed health issue he has, causes him to hallucinate -- and see Stewie from the TV show Family Guy, who offers his advice to Booth.
Booth and Brennan investigate the case of a fraternity brother named "Beaver," whose body was found inside a rival school's mascot uniform. Meanwhile, Booth helps his brother Jared look for a new job.
Brennan and Booth investigate after Sachi, the sister of Booth's detective friend Ken from Japan, goes missing, only months after arriving in the U.S. After Sachi's decapitated head is found, Ken joins Brennan and Booth to help solve her murder.
A Jeffersonian coworker dies of heart failure. While at the coworker's wake, Brennan sees the body and is convinced the death was no accident. Brennan asks Booth to help her steal the body so she can further examine it, and an odd mystery surrounding the coworker's cause of death unfolds.
Brennan and Booth delve into the world of death metal music in an effort to discover who killed the bassist of an underground death metal band, whose skeleton was found being used as a stage prop by a black metal band in Norway. Meanwhile, Sweets is working on the book he's writing about Brennan and Booth, and asks Dr. Gordon Wyatt for some input.
A female body is discovered at a recycling center, compacted into a stack of cardboard, and the Jeffersonian team is called in to investigate. Meanwhile, Booth and Brennan run into Sweets' girlfriend at a bridal dress shop -- but she's there with another man.
The team is led to a well-known physics research center after finding a piece of a meteorite in the ear of a victim whose pulverized remains were found in a garbage bag. Meanwhile, Angela's dad returns, seeking revenge on Hodgins.
The team investigates the murder of Cam's former fiancé, whose body was found in the tiger habitat of a safari park. Sweets and Angela hypnotize one of the murder suspects.
Brennan and Booth investigate the death of a 16-year-old pregnant girl who was found buried in a pile of street salt. During their investigation they uncover a high school "pregnancy pact" between the victim and some of her fellow volleyball players.
The team only has a short time to find out what happened to a murdered car salesman before his foaming bones completely disintegrate.
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.
Booth is kidnapped by the Grave Digger and the Jeffersonian team must find and save him before it's too late. Meanwhile, when evidence from the Grave Digger's case goes missing, Brennan and Hodgins are suspected of taking it.
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When a volunteer fireman is murdered at an ice rink, Booth and Brennan begin the investigation, but Booth must recuse himself due to a conflict of interest. When details come to light, Booth becomes a suspect in the homicide.
The death of female conjoined twins who worked in the circus is investigated. The investigation leads Brennan and Booth to go undercover as a Canadian knife-throwing act, and also causes Booth to come face-to-face with a clown.
Brennan's father Max lands a teaching position at the Jeffersonian. When he ends up helping out with the murder case at hand, Brennan is noticeably bothered by his sudden presence in her professional life.
Brennan and Booth's peaceful flight to China, where Brennan was going to identify pre-historic remains, gets interrupted when a fully cooked human body is discovered in the plane's industrial-sized microwave. Booth and Brennan use Brennan's high-tech equipment to send evidence to the Jeffersonian for processing. They discover that the victim was a writer who was writing a controversial piece about airline pilots, and must race to solve the case before the plane lands and they lose jurisdiction.
A body is found during a practice police raid and Brennan and Booth go in to investigate. A second body is found, leading the team on a trail of deception as they search for the killer or killers. Meanwhile, Brennan goes on a date with Booth's younger brother Jared, who has just moved to town to work at the Pentagon.
When the skull of an artist is found in a sculpture, Booth and Brennan start investigating. Both suspect the artist's assistant, Roxie Lyons, was the murderer. While being questioned, Roxie reveals that she is a lesbian ... and used to be in a romantic relationship with someone at the lab.
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 have been incorrect.
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.
The pieces of a dismembered body are found lying in a purple pool of water, except the head is missing. The team finds that the body belongs to Jared Addison, a science fiction writer who had several mental problems. With Sweets' help, several suspects are hunted down, however the team has trouble finding enough evidence with the victim's head still missing ... that is until they turn to Zack for help.
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 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.
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.
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.
