The Parks Department forms a partnership with a local company to sell energy bars at the parks in Pawnee, but Leslie tries to stop the deal when she discovers how unhealthy the snacks are. Mark reluctantly agrees to help Tom move out of his house.
In flashbacks, Stefan and Damon recall the long-ago actions taken by townspeople including their father, Guiseppe Salvatore, and Pearl, leading to the devastating events that caused the rift in their relationship. In the present, Bonnie's date with Ben takes a frightening turn. Elena helps Stefan as he and Damon race to find the missing journal that belonged to Elena's ancestor. Stefan learns the reason behind Alaric's interest in both the journal and the town's history. Damon discovers that an old acquaintance has returned to town with an agenda he understands.
An earthquake from the other side is being felt on our Universe as well. Furthermore, the only survivor seems to be from the alternate Universe. Walter attempts to get Olivia "recover" her ability to make out things from the other side.
The angels send Anna back in time to kill John and Mary Winchester before they can conceive Sam knowing that if Sam was never born then Lucifer won't be able to use him as his vessel. Castiel sends Sam and Dean back to so they can stop Anna, and the two brothers are reunited with their parents. Mary recognizes Dean as a hunter since he visited her in the past once before but tries to keep the truth from John.
The episode focuses on the character of Emily Fitch, her continuing romantic relationship with girlfriend Naomi Campbell as well as family problems with her mother Jenna Fitch. Emily decides to investigate the suicide of Sophia Morton, the girl who killed herself in the first episode, suspecting Naomi cheated on her with Sophia.
Patrick Jane and the CBI team investigate when the body of a high-end luxury car sales woman is found in the trunk of a Bentley in the dealership's showroom.
Michael hates the changes that Dunder Mifflin's new owner is implementing, so he turns to David Wallace for advice. Jim and Pam find the perfect day care center, but Jim's mistake threatens to ruin the interview.
The band, We the Kings, and their friends head in to the Silent Library.
Ban Seok meets the girl of his dreams - in the form of Da Jung.
Jeff and Britta meddle in Annie's love life when she starts dating Britta's ex, Vaughn. Meanwhile, Pierce feels left out of Troy and Abed's movie night.
Michael is caught off guard by a visit from his drug dealing neighbor Sugar. But to Michaels surprise, Sugar isn't looking for trouble He needs Michael's help fending off a crew of notorious thieves. Meanwhile, Michael struggles with working beside an unexpected partner.
The case of two high school students, one dead and one missing, lead the CSIs into the underbelly of streetcar racing and a tangled web of deadly competition.
Jenna's mother comes to visit, and she looks to Jack to help. Frank moves in with Liz as a boarder, and they decide to aid one another stop some bad habits.
Sam isn't happy with the way Maya is proposing to deal with her problem and Naomi won't talk about it at all, but Sam is dying to talk more to Addison about the sparks between the two of them and Addison doesn't want to deal with that. Following the fall out between Cooper and Charlotte, Violet offers her home for Charlotte, which doesn't exactly thrill her best friend. Patients include twin girls who are terminally ill and their little brother is only able to save one of them.
Just as the Rolling Toy Parade is about to begin, Nick's lion toy tumbles down a hill! Team Umizoomi must use Mighty Math Powers to find the scattered pieces and fix the toy in time for the parade.
Malory's career is threatened when a sensitive videotape falls into the hands of a rogue (and roguish) Cuban agent, so she calls on Archer's expertise in seduction to turn the tables on her blackmailer.
Brennan and Booth investigate a set of uniquely disfigured remains allegorizing biblical text. As they acquire more information about the victim, a former patient of Dr. Adam Copeland at Havenhurst Sanitarium, they are confronted with suspects who are hard to characterize as either good or evil. Meanwhile, Jeffersonian intern Arastoo Vaziri reveals a secret about his past.
Dawn competes in the finals at the Daybreak Town Contest for her fifth ribbon.
When a young woman's body is found in Central Park, drained of blood and missing part of her ear, the CSIs jump start an investigation that takes them into the dark and mysterious subculture of vampirism.
The final game of the regular season has the East Dillon Lions slated to host the Dillon Panthers in what is sure to be the mother of all cross town rivalries. When the Panther boosters question the fitness of the East Dillon field it quickly escalates from toothpick pranks to torn up turf. Meanwhile the pro-life witch-hunt to get Tammy terminated for counseling the pregnant Becky escalates. Adding to the chaos, Mindy goes into labor, Billy goes on a caffeine bender, and soon after the boy is born, Uncle Tim gets arrested when the cops bust the chop shop. Meanwhile ...