While investigating a case involving a headless corpse, Brennan and Booth encounter Ichabod Crane and Abbie Mills searching for answers of their own; Brennan and Booth come up with Halloween pranks.
Two sanitation workers (Sal Vulcano and James Murray) find a U.S. senator's corpse in a street sweeper; Aubrey looks into Jessica's past.
A political journalist is murdered after publishing an article regarding corruption in the NSA; Hodgins' paranoia increases as members of the team realize they are being monitored; Brennan plans a surprise for Booth; a Thanksgiving celebration.
Booth and Brennan go under cover at an Old West-style shooting competition; Angela and Hodgins talk about the future; Cam and Sebastian grow closer.
The team investigates a police officer's murder; the team decides what is important to their futures.
Hodgins navigates life in a wheelchair; when a public defender is murdered, several of her previous clients had motives to kill her.
The team investigates the death of a men's rights organization founder who may have been the victim of domestic abuse; Brennan loses her temper during an interrogation; Angela and the team struggle with Hodgins' bitterness.
The team hunts for a serial killer who appears to have sinister interactions with the victims' bodies before dumping them; Booth and Aubrey consult a behavioral analyst to help find clues to the killer's identity.
A suspect in the murder of a convicted felon who had been released to a halfway house has ties to Booth; Brennan testifies at an FBI hearing about her assault of an unarmed suspect from a previous case.
The team investigates the death of a private investigator found frozen after being dumped in the Potomac; Aubrey finds shocking information connected to his father's whereabouts.
The team investigates the death of an a cappella singer whose body was found in a lab rat; Hodgins applies for an experimental nerve regeneration study; Booth tries to plan a summer trip with Parker; a new intern joins the lab.
An intoxicated college student discovers the dead body of a Secret Service agent just before a scheduled presidential visit to the area; former intern Dr. Colin Fisher leads the investigation while Brennan battles a case of the flu.
A documentary crew producing a television segment on the Jeffersonian's Medico-Legal lab follows the team as it investigates a corpse found in a landfill.
Booth's hockey knowledge comes in handy when the team investigates the death of a player whose headless corpse was left in the river; Hodgins and Oliver use drones to see who can retrieve the victim's head.
The investigation into the murder of a billionaire explorer who went missing 10 years earlier reveals Dr. Clark Edison as a suspect; Cam's sister visits to help with wedding plans.
Sweets goes undercover in the chess world to find a killer; Cam gets a science award but fears offending Brennan, who feels she deserves it; a sunny new podiatrist intern annoys Brennan.
The team investigates the murder of a kidnap victim whose remains were found at a park; Hodgins makes a discovery about his family; Brennan and Boothe consider co-mingling their money.
Booth and CIA agent Danny Beck (Freddie Prinze Jr.) must track down a terrorist after a CIA informant is murdered; Brennan and Booth must consider the ramifications when Brennan wants to do more work in the field with Booth.
When the remains of a repo man are found in a septic tank, the team learns he had a troubled past; a forensic anthropologist (Ignacio Serricchio) who has defected from Cuba needs an internship.
When an actor known for playing a popular character on a kids' TV show is murdered, unexpected suspects are discovered; Brennan and Booth plan a party for Christine's birthday; Clark asks for opinions on his novel.
When a wealthy artifact collector walks into his own funeral, the team must determine the real identity of the deceased; Finn's new hot sauce venture is making big money.
The remains of a former art student are found in a log in a forest; Wendell returns after beginning cancer treatments; Booth prepares for an FBI competency test.
The team investigates the death of a woman whose body was cryogenically frozen before being dumped in a swamp; Cam is nervous to meet Arastoo's parents; Booth is up for a promotion.
A skull smashes the windshield of a car driven by a group of teenagers on the freeway; a trail of suspects leads Brennan and Booth to a strange cannibalistic society; Cam suggests that Angela hire a private investigator to find her ex-husband.
Brennan and Booth investigate when a soccer mom is blown up in her minivan; the investigation uncovers that the woman was a member of the National Liberation Army.
The team investigates a footless corpse that was found in the woods; Brennan and Booth's questioning leads to several suspects, including the victim's wife; Angela agrees to undergo hypnosis to remember her former husband's name.
When the founder of an organic supermarket chain is found dead, Brennan and Booth suspect foul play by a rival farmer; the two agents visit a new psychiatrist, who warns that the FBI may separate them.
When mummified remains are found at Halloween attractions, Brennan and Booth realize that they must find the killer by Halloween or there will be another death.
The team suspects colleagues when the remains of a young Jeffersonian intern are found in the building's incinerator; Booth poses as Cam's boyfriend and accompanies her on a family get-together.
When high-school classmates reunite to unearth a time capsule buried 20 years earlier, they find the corpse of an adolescent friend inside; while combing through the victim's life, the team members rehash their own teen years.
After construction workers find an archbishop's body with the kneecaps surgically removed, the team returns to the case of the Widow's Son serial killer.
Three days before Christmas the body of a bearded man in a tailor-made Santa outfit turns up in a sewer; Brennan visits her father in prison and plots a nontraditional holiday reunion.
When the remains of a professional motorcycle racer are found in a hot spring, the team suspects his rival to be the murderer; Dr. Lance Sweets forces Booth and Brennan to accompany him on a double date.
After a woman's car is run off the road, only her baby survives; Booth and Brennan go to the woman's hometown to investigate.