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 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.
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.
Not that anybody liked him before, but the talk of Craig being useless is resurfacing. In his effort to prove he’s useful, he breaks their hook while fishing.
When a thunderstorm frightens the dinosaurs, the team must find them and return them to the museum before the dinosaur show.
The team goes after a con man masquerading as a psychic medium in order to drain the life savings of his bereaved clients.
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.
The football player who tackled his own teammate gets a Web Redemption, and Daniel predicts the future.