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.
The arrival of a building from the alternate Earth causes massive death and destruction to those occupying the site at its arrival. Walter soon realizes that to equalize the balance between universes, another building will have to disappear... along with everyone inside it. The team's only chance is for Walter to activate Olivia's long-buried ability to distinguish objects from the other universe.
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 1978 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.
Emily and Naomi are loved up and enjoying their extended summer of love together. The thorn in Emily's side is her family. Her mother is unable to accept Naomi as anything other than a bad influence, and is keen for Emily to go travelling alone.
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 sexual attraction between Belle and Duncan heats up over a late-night chat session, while Jackie wants her sister to accept that she and Ben are now a couple, and Bambi ignores Belle's warnings and falls for a handsome client.
Jeff and Britta team up to derail Annie's fledgling romance with Greendale's resident hippie singer-songwriter, Vaughn.
Michael is caught off guard by a visit from his drug dealing neighbor Sugar. But to Michael’s 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.
Addison and Cooper are counseling a couple who must pick a child to save with their newborn's cord blood. Meanwhile Dink wants to marry Maya.
The team must find all the parts of Nick's lion toy before Umi City Park's rolling toy 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 jumpstart an investigation that takes them into the dark and mysterious subculture of vampirism.
Tensions in town run high as the Panthers/Lions game approaches; Coach tells Luke he won't be playing; Tami attempts to placate her detractors; developments both good and bad shake up the Riggins boys; Vince teams up with Kennard to seek revenge.