Archer's surprise birthday present - a high-tech, souped-up spy car - leads to all sorts of other surprises. None of which are good.

In the spirit of Valentine's Day, Meredith and Derek try to have a night to themselves when Lexie offers to watch Zola; Callie hands babysitting duties over to Mark so that she can surprise Arizona with a romantic evening; and Ben proves to Bailey that he knows her better than she thinks. Meanwhile, the ER fills with romantics, including a 10-year-old girl who has an allergic reaction to chocolates from her valentine and a man who is hit by a car while chasing down his frustrated girlfriend.

Dave welcomes actor Nicolas Cage, actress Michelle Dockery, A Top Ten List presented by Foo Fighters, and musical guest The Kills. Top Ten Interesting Facts About The GrammyAwards. Nicolas Cage tells how he and Charlie Sheen were nearly arrested for making trouble on a plane. Is Nicolas Cage a vampire? The "Ghost Rider" star addresses the rumors sweeping the Internet. Dave welcomes Michelle Dockery, star of the hit PBS series, "Downton Abbey."

The Machine identifies Darren, a teenager whose brother was just murdered, as the next POI. Meanwhile, Finch is growing concerned that the son of his former business partner is dangerously close to finding out about the Machine.

When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.

Actress Lisa Kudrow; ''Weird Al'' Yankovic performs. Also, Craig talks with Ben Dukes of the Late Late Show security staff.

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.

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.

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.