Penny worries that she's screwed things up permanently with her friends, while Sheldon takes command of the paintball team.

A fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.

Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.

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

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

When his mother comes for another visit, Sheldon is disappointed that she's stopped being the mother he wants her to be. When he is in bed and once again demands that she sings "Soft Kitty" to him, they are interrupted by Leonard halfway through the song. Sheldon, after sitting out in the rain, returns home soaked and with a bad cold.

A discussion with Penny doesn't help, and after Sheldon makes him feel less guilty by citing Friedrich Nietzsche, Leonard decides to go to Alice's apartment. While they are making out, he changes his mind and confesses that he has a girlfriend, prompting Alice to throw him out immediately. At the end of the episode, Leonard video calls Priya and tells her about Alice.

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Leonard accepts an offer to go to the movies with Penny, strictly as friends. However, when she chooses a Jennifer Aniston movie to watch, Leonard takes issue, and reveals that he only pretended to like things during their relationship in the hope of getting sex at the end. As sex is now off the table, he is no longer going to pretend to want to watch what she wants to watch

After talking to Penny, he interrupts Amy and Stuart during a movie to change the paradigm of their relationship. He hesitantly asks Amy to be his girlfriend, which she gladly accepts. When Sheldon presents her a "relationship agreement", she is delighted and calls it very romantic. Amy later feels that she should've gotten a lawyer, when she finds out that her obligations as a girlfriend include taking care of her boyfriend's injuries

Leonard is hesitant when a bully from high school wants to meet for a drink. Meanwhile, Penny comes to realize she was a bully herself. Leonard must face his fears after being contacted by his high school tormentor. In the meantime, Amy and Bernadette help Penny choose a philanthropic endeavormaking Leonard feel guilty.

Leonard and Penny's relationship hits an impasse when, while on a double-date with Howard and Bernadette, she reveals that she takes career advice from a psychic, only for Leonard to laugh at her, infuriating her. Later, Howard shows Leonard that if he wants to be able to ever be in a relationship, he'll have to accept that people will have differing beliefs

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the thermostat is located in the office of a professor going through the hot flashes of menopause (thus Sheldon is too cold) , the mockingbird outside his window is off-key with the annoying windchimes, the perpetually naked Professor Rothman refuses to vacate, and the Geology Department upstairs makes too much noise. Finally, Sheldon gets his head stuck in the wall, as his scientific curiosity made him want to know what's inside

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In this installment of the show. Leonard and Sheldon obtain Celebrity Travel options as a present from Penny. Meanwhile, Raj is affected after a time frame set up by his mother and father. Raj has found her would-be-wife. The guest stars will be Chriselle Almeida as Lakshmi, Leonard Nimoy as Spock for the episode.

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In this installment of the show. Howard is very much depressed after knowing about the date of the space mission as its date clashes with his wedding. So he is seeking for another way out for it. In the meantime, Leonard has stated something weird about in the bedroom which actually shocked Penny.

In this installment of the show. Howard and Bernadette are excited for their relationship and decided to take it forth. The entire planning has been done for the wedding and the gang is participating in full strength. NASA mission is approaching and they want the wedding to be done before it. Everybody happy!