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.

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.

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.

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.

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.

While en route to China to identify prehistoric anthropological remains, Booth and Brennan are called upon to solve a murder in midair when the flight attendant discovers a fully cooked human body in the plane's microwave.

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 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.

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.

With Cam’s reputation and career on the line, the team travels from overseas to help her solve the case of an unidentified young boy. The Forensics Anthropology Unit lost much of its vigor after disbanding to pursue personal ventures, and it will take the collaborative energy and knowledge of the newly reunited team to unravel evidence and find closure for the family of the unknown boy. After unearthing new clues in the lab and making unexpected personal discoveries, the team realizes they belong back in Washington, D.C.

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.

The corpse of a truck company employee is found in the middle of the woods. After the victim’s son is questioned, Booth and Brennan visit his karate class in search of a motive. Back at the lab, Hodgins is going overboard purchasing lab equipment. Then, Booth’s son Parker returns from England and Brennan is apprehensive about how he’ll react to his new baby sister.

The Jeffersonian team investigates the murder of Nancy Handelman, whose body was discovered at the time of Brennan and Booth's wedding rehearsal. When the case becomes more serious than the team anticipated, Cam and Angela do everything in their power to keep the details of the investigation from Brennan in order to ensure that she will stay focused on her big day. Tensions run high when unfortunate events occur to stall the wedding temporarily, and Max comes to town with a suspicious duffle bag full of money.