After spending the night with Raj, Penny is worried that her friendship with the guys is in jeopardy, while Sheldon becomes the paintball team leader.

Amy tries to resolve a fight between Penny and Sheldon. Leonard tries making his long distance relationship with Priya better.

Leonard escorts Amy to a wedding. Meanwhile, Howard and Bernadette spend the weekend with his mother.

Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.

Sheldon and Leonard are invited to a party hosted by Wil Wheaton, and Howard is offered a once-in-a-lifetime event.

Sheldon competes with the gang for his mother's attention when she comes to visit.

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

Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.

Sheldon tries to cure his phobia of birds, while Leonard and Penny experiment with hanging out alone.

Sheldon finds himself jealous when Amy goes on a date with Stuart.

Leonard has to face his old high school bully, while Penny thinks she may have been a bully herself.

Sheldon gets in trouble with Amy when he isn't impressed by her recent accomplishment, and Howard must come to grips with Bernadette's dislike of children.

Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two.

Leonard and Penny experiment with dating, while Raj develops a peculiar relationship with his phone\'s virtual assistant.

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

Sheldon's is required to take some vacation time away from work, and Amy pays the price. A pre-nuptial agreement rears its ugly head between Howard and Bernadette.

When an office at the University opens up, Sheldon must compete for it with his archenemy, Kripke. Meanwhile, a gift from Amy makes Penny uncomfortable.

Sheldon\'s life is turned upside-down after his barber gets sick. Meanwhile, astronaut training causes Wolowitz to rethink his decision to go into space.

Sheldon chooses to play video games with the guys rather than go with Amy to her aunt's birthday party.

Leonard and Sheldon receive Star Trek figurines as a gift from Penny. Meanwhile, Raj is smitten after a date set up by his parents.

When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.

Bernadette reconsiders marrying Howard after learning about his sexual history.

NASA reschedules Howard's mission, putting the wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.

When Howard and Bernadette decide they want to be married before his NASA launch, the gang rushes to put on a wedding.