While Sheldon is at home in Texas, the rest of the gang realizes how much he has changed their lives as they decorate the apartment Christmas tree.

When Penny’s big acting break on NCIS is a bust, Leonard struggles to help her, which results in Penny asking Leonard a bold relationship question. Meanwhile, Raj and Stuart try…

Sheldon tries to relax after he is forced to take a vacation. Meanwhile, Leonard struggles to be supportive of Penny after she quits her job, and Bernadette seeks Stuart’s help…

Sheldon must choose between joining Amy at her aunt’s birthday party or playing videogames all weekend with the guys.

After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.

A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.

When Stuart asks Amy out on a date, Sheldon must confront his feelings and consider where his relationship with Amy is going.

Sheldon’s selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.

Sheldon and Leonard get invited to a party at Wil Wheaton’s house, and Howard gets an out-of-this-world opportunity.

Sheldon becomes concerned when everybody begins to hang out at Raj’s apartment and discovers Leonard is the center of the group.

The guys find a “super” use for Penny’s new boyfriend, Zack, when they enter a costume contest as the Justice League.

A fellow comic book enthusiast’s hitting on Penny leads to Leonard and Howard going to a bar’s Ladies’ Night.

Penny’s second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there’s a crucial error in a NASA project…

Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.

Sheldon winds up in traffic court when he gets a ticket because of Penny.

A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.

After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.

A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.

Silas contemplates a big professional move; Nancy has a dinner date with Rabbi Dave and some of his friends; and Andy experiences a slight hitch in his relationship status.

Nancy undertakes a job search; Jill has big news for Andy and Doug; and Silas tries to track down his stolen plants. Meanwhile, Shane fabricates an ingenious plan to score…

After receiving an interesting proposal from an unexpected source, Nancy struggles with a decision involving a questionable business.

Paul Robinette places the system on trial when he defends a young black woman accused of kidnapping her biological baby from his white, adoptive parents.