Chuck goes undercover at Sarah's 10-year High School reunion, where they meet the girl that tortured Sarah back in the old days.
Ted and Stella move up their wedding date, but the wedding may not go off as planned after Ted breaks the "No Exes Rule" and invites Robin to come in from Japan for the wedding.
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Vanessa uses the scandalous picture of Catherine and Marcus to blackmail Blair into being a nicer person, so Blair seeks revenge by enticing Chuck to seduce Vanessa. Lily and Bart throw an extravagant housewarming party and expect their children to make them proud in front of the attending press, but a rebellious Serena isn't ready to play by their rules. Meanwhile, Dan and Jenny discover a big secret that Nate has been keeping from his friends.
Alan and Shirley prepare for a fight with the military on behalf of a man whose brother died under suspicious circumstances. Meanwhile, Jerry helps his sister in her search for the identity of the father of her son, who was conceived through an anonymous donor.
Charlie tries to help Jake's former teacher, who became a stripper after dating him, but things go from bad to worse when she has a religious conversion.
The new Sam decides to take a trip to Africa in hopes of providing some help to people who desperately need it, but then chickens out when she finds out what it's going to take to get there.
A 43-year-old man takes a nap at his parents house, and is later found dead in bed. The man had several conditions that put his health at risk, including morbidly obesity, high blood pressure, and sleep apnea. However, Dr. G is hesitant to jump to conclusions when her autopsy findings dont quite add up, so she opts to wait for the toxicology results before closing the case. A 53-year-old woman is found dead on her couch. The woman was obese and a smoker, her son notes that she had suffered an episode of intense eye pain the day before, and Dr. G finds signs of trauma on the womans lower body. With many potential suspects, only Dr. Gs autopsy will narrow down the cause of death.
Tim and Tarquin's family has outgrown their house. The lack of bedrooms and angled walls on the main floor have them wondering what to do. Designer Hilary and Realtor David want to help the family with their housing problems. Hilary and her team will renovate the major problem areas of the house to make the family love it again. David will search for houses that will convince the family to leave. And after all the work is finished, Tim and Tarquin will have to make a decision about their house. Will they Love It? Or List It?
Lauren and Audrina travel to Cabo for Brody's birthday, but Audrina's problems with Justin threaten to ruin the festivities. Back in LA, Spencer gives Stephanie's new boyfriend a hard time over dinner.
A fraudulent astrologer named Martin Trueman is hit by an extraterrestrial body and begins to impress everyone with his uncanny predictions. However, what he predicts for Sarah Jane is far from pleasant...
Vince gets a taste of the fashion world when he agrees to do a Dolce & Gabbana photo shoot with a gorgeous supermodel. Ari pays his respects at a funeral while he tries to work a deal for Vince.
Bullock makes Stan his "No. 1" at the CIA, a promotion that makes the furious Francine the "No. 1" babysitter for Bullock's baby son. Bullock needs someone to watch the kid because his wife's been kidnapped by Iraqi insurgents.
When Tim gives Amy a beautiful Grand Prix jumper for her birthday, she's forced to make a difficult choice between a career in show jumping and her work at Heartland.
The kids fail at their group magic project, so Jerry devises a plan that will force them to work together. Now Alex must wrestle with sacrificing her first one-on-one date with Dean so that she and Justin can help Max's superhero, "Maximan," solve the crime and prove to Jerry that the siblings can work as a team.
The 1978 death of a teen roller skater who was found in a ravine is reinvestigated when a new witness comes forward.
Three teenagers from the Pai Zhug Kung Fu Academy are chosen to fight the forces of an opposing academy and all other forces of evil.