Alex Ball

In the first part of the one-hour seventh season premiere, Sheldon and Penny bond in Leonard's absence, but it's Sheldon's feelings that are crushed when Leonard returns from the North Sea. Guest star Regina King returns as Mrs. Davis, the University's Director of Employee Relations.

Love is in the air when Amy convinces Sheldon to join her (as well as Howard and Bernadette) for a romantic weekend in Napa Valley to celebrate Valentine's Day. Meanwhile, Leonard and Penny must rush Raj's dog to the vet.

Rachel nearly gags on her meal when she secretly meets at a restaurant for a job interview and sits right next to the table where her current boss is dining. Phoebe considers legally changing her married name to something more exotic. Meanwhile, Joey feels abandoned when Monica and Chandler try to buy a house, but Joey finds solace with the sellers' precocious 8-year-old daughter, Mackenzie (Dakota Fanning - "The Cat In the Hat").

When Jake insults Hitchcock and Scully's work ethic in the precinct, they force their way into one of his cases in attempt to prove themselves. Meanwhile, Amy and Gina help Rosa conquer one of her biggest fears, and Holt and Boyle work a celebrity case.

McGee and Bishop travel to Afghanistan after a murder case in the states is linked to a string of soldiers killed by friendly fire overseas. Also, Kasie leaves the lab and accompanies Torres into the field to process additional forensic evidence.