When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.
Criss and Liz decide to celebrate Valentine's Day, but they need to buy a dining room table first. Jack entertains his mother-in-law, Diana, as Jenna frantically looks to Pete to fill in last-minute as the producer of her first live performance on "America's Kidz Got Singing." Back at the office, Tracy and Frank try to help Lutz find someone to spend Valentine's with.
While a jury deliberates the guilt or innocence of a defendant on trial for murder, Jane tries to prove she has been wrongfully accused before time runs out. Meanwhile, Summer may have gone too far when she helps Cho make a case against a suspect.
Elena is surprised to receive an invitation to a formal ball, and when Damon and Stefan hear the party is being hosted at Klaus’s newly renovated mansion, they both insist on attending the event with her. Caroline and Matt also receive invitations to the ball from unexpected admirers. At the elegant party, Elena learns of a horrifying plan that could lead to numerous deaths and she must decide who she can trust with her new information. Caroline discovers a side of Klaus no one would have suspected. Finally, after an evening of violence and dashed hopes, Damon finds a new way to cope.
When one of their number disappears on the same day that an American girl joins their ranks, a group of English boarding school students embarks on solving a mystery.
Criss and Liz decide to celebrate Valentine's Day, but they need to buy a dining room table first. Jack entertains his mother-in-law, Diana, as Jenna frantically looks to Pete to fill in last-minute as the producer of her first live performance on "America's Kidz Got Singing." Back at the office, Tracy and Frank try to help Lutz find someone to spend Valentine's with.
Dwight scores a special assignment at Sabre's Florida headquarters. As a result, he and Andy must decide which Scranton staffers will join him. Elsewhere, Pam returns from maternity leave.
Set against the attack on Pearl Harbor, Gladys’s secret job is exposed, while Lorna grapples with a possible pregnancy and Kate struggles to stand up to the return of her manipulative father.
He put a man on the Moon in the Victorian Era. He criticized the Internet...in the 1863. Jules Verne is the ultimate futurist, with a legacy of sci-fi stories predicting everything from fuel cell technology to viral advertising. The extraordinary voyages of Jules Verne span from the center of the Earth to the surface of the Moon, inspiring art, industry, culture, and technology with an enduring question: Where can science take us?
As Quinn distracts Jamie, Haley searches for Nathan. Clay finally gets answers about his condition. Meanwhile, Julian attempts to get back to a normal life, while Brooke tries to give Tara a chance.
Phil's preoccupation with a business opportunity blinds him to his new partner's inappropriate behavior around Claire. Meanwhile, Jay and Gloria may regret letting Mitchell and Cameron be their temporary house guests when their home is being fumigated.
In the excitement over Emily and Daniel's engagement party, things start to unravel for everyone; Victoria uses Conrad's father against him; Jack gets more involved; Charlotte and Emily both face problems.
Frankie and Mike decide to try a fresh approach to Valentine's Day by having dinner out with friends. But a clueless Mike angers Frankie by refusing to present her with a simple romantic gesture. Meanwhile, Axl can't think of a life-changing moment that's occurred in his life when he's assigned to write a school paper on the subject, Brick is tasked with writing a report on love, and a hapless Sue doesn't understand why her new boyfriend has suddenly turned into a bad kisser.
Alfie is ping pong coach and Vera’s upset with the article. Eddie plans a prank on Mr Sweet. Victor completes the task. Senkhara is furious. Mara & Vera have a hearing about Mara’s claims. Fabian thinks he's solved the task, Eddie’s Mr Sweet backfires.
The team competes in a trauma wound foundation contest then return to the lab, which has been transformed into a jungle, and discover they'll be studying live animals to create something beautiful but deadly.
Now a successful local businessman, Frank joins a lucrative real estate deal but his plans are thwarted by the police, who believe he's a terrorist.
The BAU tries their luck in Atlantic City when the team is called in to investigate a series of ritualistic casino-related murders. Also, after a spat with her boyfriend, Kevin, Garcia thinks she and Morgan may have gotten a little too friendly with each other.