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 cage at the zoo. 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.
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.