Billy Gibbons

Construction workers find a skeleton in an old fallout shelter from the 1950s and the Jeffersonian is brought in to help identify the remains. When Zack cuts into the bone, he accidentally releases spores of the deadly fungus Valley Fever, causing the team to be quarantined in the lab over Christmas. While everyone tries to maintain the holiday spirit, Brennan buckles down to solve the mystery of the fallout shelter.

Booth and Brennan are on the case when shattered, pulverized human remains are found in a garbage bag at a photo shoot. When the team discovers a meteorite shard lodged in the victim’s ear, they are led to the Collar Institute of Science, a famous center for physics research in D.C. After questioning scientists at the institute, they discover the remains are those of Dr. Diane Sidman, a leading scientist and editor-in-chief of the Journal of the Collar Institute, who was also engaged to the Collar’s founder. When they discover Dr. Sidman had been working on an extremely controversial project, Brennan and Booth investigate a multitude of death threats directed at her. As the team tries to decipher the cause of her death, Booth and Brennan are on the search for the killer, but their scientific method leads them into a dangerous situation. Meanwhile, Angela’s father (guest star Gibbons) comes to town to seek revenge on Hodgins, and Sweets attempts to mediate the situation.

The decomposed skeleton of what appears to be a young girl is found in a grocery cart in the D.C. area. Angela's reconstruction based on the evidence reveals the face of an 80-year-old woman, not a child, but the team learns the victim actually was a 22-year-old woman with a debilitating aging disease. Brennan and Booth's investigation leads them to the victim's mother, who points a finger at a former caretaker. But without a definitive lead, the team searches to find out who would want to take this defenseless woman's life, and the case strikes an especially emotional chord with Brennan. Meanwhile, Brennan's father, Max Keenan (guest star Ryan O'Neal), reappears in Brennan's life in an attempt to make a connection with her and deliver information from her past, and she's surprised by her reaction. Hodgins and Angela walk down the aisle with Brennan and Booth as maid of honor and best man, respectively, but all does not go as planned.

The team discovers the remains of a so-called “storm chaser” who seems to have died while following a tornado. But footage recorded during the storm ultimately leads them to believe he was murdered. Meanwhile, Booth becomes increasingly overprotective of Brennan both at home and in the field, and sleep-deprived Angela and Hodgins come to terms with having Angela’s father and rock musician (guest star Billy F. Gibbons) babysit their infant son.

After notoriously murdering “The Gravedigger,” sniper-on-the-loose Jacob Broadsky (guest star Arnold Vosloo) strikes again. This time, his victim is a prior suspect who escaped the justice system. More determined than ever to catch Broadsky, Booth uses his own military training to beat the sniper at his own game. He vows to go to any lengths necessary to ensure that justice is served. In a heated and dramatic face-off, Booth has minutes to catch Broadsky before he hits an intended target, but Broadsky’s skill and speed may prove to be a worthy adversary. Meanwhile, Angela’s father (guest star Billy F. Gibbons) visits the Jeffersonian and insists on naming his unborn grandchild.