Alex Ball

Sheldon and Penny bond in Leonard's absence, and Koothrappali finds someone to share his heartache with. Elsewhere, while away at an out of town conference, Bernadette and Amy are hit on at the hotel bar.

Love is in the air when Amy convinces Sheldon to join her, as well as Howard and Bernadette, for a romantic train trip to Napa Valley to celebrate Valentine's Day.

Rachel goes to a job interview at a restaurant and winds up sitting next to her current boss; Joey feels abandoned because Monica and Chandler are leaving.

McGee and Bishop head to Afghanistan when a local case is connected to a series of friendly fire deaths overseas. Kasie ventures out of the lab and joins Torres in the field to analyse additional forensic evidence.

Terry tries to get used to life on the outside, while Abby travels to Boston and Paige attempts to sell the studio.

Ray turns to Volcheck for help in taking down Cochran, while at home, Bridget argues with her parents about Marvin.