Adam Gregor

The guys decide to compete in the university's Physics Bowl, but since Sheldon's only focus is to prove his mental superiority, the guys kick him off the team. To take his spot, they enlist his nemesis Leslie Winkle (recurring guest star SARA GILBERT).

A lonely female novelist is in love with a legendary spy hero who has been dead for 20 years. She buys his sports car in an auction only to find out that his ghost comes with the car.

On a mission in London, Jonas has to decide whether to trust an old friend, and Kim helps a suicidal woman.

Bill falls for a deceptively sweet FBI efficiency expert after he and Ralph bust a Soviet gunrunning ring.

There is a flashback to Reagan's pregnancy, when her birthing plan fell apart, Chris struggled with the decision to leave his law firm, and Ava overcame the fears that were keeping her away from Reagan at the time.

Reagan enlists her mother's help to make sure Amy's first Christmas is perfect, Chris goes to the mall to find the perfect gift for Reagan, and Ava doubts her relationship with Kevin when he decides to see his ex-wife.