When the Jeffersonian team identifies the remains of a woman found in a paintball field, they discover two missing-persons reports in her file. Booth and Sweets interrogate the victim's husband and learn that she suffered from amnesia. When squint Wendell Bray learns that the victim also survived a bullet wound, inconsistencies in her medical records uncover a surprising crime linked to her murder. Meanwhile, Brennan and Booth adjust to their new life as an expectant couple and deal with the forthcoming changes in their home life.

Pierce is excited about a party he's throwing to celebrate his business success, but the affair becomes very different when his elderly father arrives.

The doctors become nostalgic when George O'Malley's mother, Louise, returns to Seattle Grace for medical help after a botched surgery at a neighboring hospital; the residents are inspired by a medical miracle when they witness a harvested heart that continues to beat outside the body; a new pediatric fellow excites Arizona and makes Alex feel threatened; Jackson lets his suspicions about Mark and Lexie interfere with his work; and Henry and Teddy have their first marital fight when he expresses interest in pursuing medical school

The gang uses the Internet to cyber-stalk their prey. Frank tries to drum up business for Paddy's with a viral video.

"Beavis & Butt-Head" creator Mike Judge entertains with a dialogue and voices from a recent episode.

A local Pawnee group predicts the end of days, causing chaos in the Parks department.

The Machine identifies a school teacher who witnessed a mob hit as their next POI and Reese and Finch rush to save his life.

Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.

Hans Beinholtz hawks Europe to investors, Colbert Super PAC adopts Herman Cain's fundraising strategy, and Nathan Wolfe examines viral pandemics.

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Jenny forgets a special anniversary with Kevin. Andre seeks line-up Nirvana. Kevin is haunted by Pete's imaginary character, the "Bobbum Man," which takes on a life of its own through Taco's offline social network called "My-face."

The search for a serial killer hits close to home for Jane when he encounters a blogger who has devoted his life to finding the killer

Dwight installs a Doomsday device that will fire employees if they make too many mistakes in order to help efficiency.

With help from Elena and Bonnie, Alaric tries to decipher the meaning behind his recent discovery Elena and Rebekah engage in a mean-girl power struggle, until Rebekah finally reveals some of her family's ancient secrets and the violent past she shares with Klaus and Elijah. Damon tries a reckless new approach to make a breakthrough with Stefan, and they're both surprised by an unlikely ally.