After the skull of a promising young dancer is found lodged in concrete at a construction site, the team must first figure out what happened to the victim’s skeletal structure. After learning the victim quit ballet to pursue hip hop, Booth and Brennan uncover another layer of evidence that points them to a suspect who had a secret relationship with the victim. Meanwhile, when Hannah is put on assignment in a dodgy part of town, her safety is jeopardized and her life is put in critical danger.

After a classroom smackdown with a group of "mean girls" led by Meghan, Britta, Shirley, and Annie bond with Abed by turning him into the ultimate "mean girl." Meanwhile, Jeff and Troy embrace a zen-like spirituality under the guidance of a groundskeeper when they come across a secret trampoline on campus. Determined to uncover the source of their new bliss, Pierce ends up taking a disastrous turn on the trampoline and lands in the hospital.

When shredded remains of a man are discovered, evidence leads to multiple possible suspects.

Owen puts the residents through a rigorous trauma certification drill; Cristina is left alone to monitor an ill lung transplant patient.

A blast from the past prompts the guys to expand membership, and Dee to re-consider her future.

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Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.

A popular children's TV character is outed, and Elvis Costello threatens to cut off Stephen's thumbs.

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Andre and Ruxin refuse to accept a tie, adding to Kevin's current frustrations as league commissioner. Pete has a connection for great Bears tickets, but the gang warns him about what he may have to provide in return. Taco discovers Western medicine.

A building explodes while Patrick Jane and the team are investigating a death threat; Libson once again runs into billionaire Walter Mashburn (Currie Graham).

Pam and Jim prepare for Cece's baptism. When Cece goes missing, Jim fears Angela has taken her.

An Ancient Presence In Mystic Falls, Stefan and Damon come to Elena’s assistance and, in the process, learn surprising new information about people, vampires and events in the distant past. Jeremy helps Bonnie after she casts a difficult and exhausting spell, and Caroline does what she can to make things easier for Tyler. Finally, Stefan and Damon reach a new understanding.