Air date: 3/19/09

Booth and Brennan investigate a petrified human body found buried in a mound of salt in a city de-icing truck. They discover that the victim was a pregnant 16-year-old high school volleyball player, and are shocked to find that nearly half of her teammates are either pregnant or already have had babies from the same father. Meanwhile, Roxie breaks up with Angela, who, seeking solace, has a one-night stand with Hodgins.

The Doctor in the Den

Air date: 4/2/09

The half-eaten body of Cam’s former fiancé is found in the tiger enclosure at the wild-life park, and Booth and Brennan determine the death was no accident. The team pieces together the fiancé’s final evening and questions suspects, including Brandon Casey whom Sweets and Angela hypnotize to help jog his memory. Angela takes a vow of celibacy and we learn that Clark is romantically involved. In the end, Cam offers to adopt the doctor's daughter.

The Science in the Physicist

Air date: 4/9/09

Booth and Brennan are sent to investigate when human remains are found during a photo shoot. When the team uncovers a meteorite in the victim's ear, they are led to the Collar Institute of Science in D.C. There they learn the victim had been a part of a controversial project, Brennan and Booth must investigate the several death threats she had received. Meanwhile, Angela's father arrives in town to confront Hodgins.

The Cinderella in the Cardboard

Air date: 4/15/09

When an image of the Virgin Mary turns out to be a bloodstain at a cardboard recycling plant Booth and Bones find a flattened body inside a compressed bale of cardboard. The line of suspects grows longer when the team discovers that the marriage-obsessed young woman had a fiancé as well as numerous boyfriends from a cell-phone dating service. Booth and Bones must break the news to Sweets when they see his girlfriend Daisy trying on a wedding dress with another man, and Angela and Hodgins come to terms with their relationship.