Leonard, Penny, Howard and Bernadette go out to dinner on Valentine's Day where Penny sees a couple she despises and the woman is being proposed to. Leonard decides to do ...

After one insensitive and self-serving move too many by Sheldon, Leonard has had it with him and decides to move out, even throwing the roommate agreement into the garbag ...

Sheldon and Barry Kripke are both working on grant proposals for the same thing. As the university can only submit one proposal, they make Sheldon and Kripke work togethe ...

The guys are off to a Comic-Con in Bakersfield. On the way they decide to stop at Vasquez Rocks where many Star Trek episodes were filmed and take some pictures of their ...

A surprised Leonard finally comes to the realization that Sheldon's assistant, Alex, is attracted to him. As he believes it negatively affects him since Alex is not focus ...

Much to Penny, Bernadette and Amy's chagrin, Leonard organizes a boys only Saturday night get together for himself, Sheldon, Howard, Raj and Stuart to play a holiday them ...

Howard isn't looking forward to the dinner he and Bernadette are having at her parent's house. In particular, he and Bernadette's father, with who Bernadette would really ...

Howard finally replaces his scooter with a car and is assigned a parking spot at Caltech. Unfortunately it's Sheldon's spot even though he doesn't own a car or drive. A w ...

Sheldon decides to tape a special Fun With Flags episode about Star Trek flags, and invites his friend, Wil Wheaton to be a guest star. During the taping Amy, who is in d ...

Sheldon and Stephen Hawking begin playing a popular online game Words with Friends. When he stops responding to their game, Sheldon begins obsess about being ignored. Mea ...

Stuart decides to organize a Halloween party at his comic book store so Raj decides to become the party planner. At the encouragement of Amy and Bernadette, Penny decides ...

Howard returns to Earth feeling dejected when he finds out that his friends are not waiting for him at the airport at the request of Bernadette, who wants to spend some q ...

Sheldon needs someone to read through the works he did during his elementary school days, to find out if he has made a scientific breakthrough that was Nobel Prize worthy ...

Penny tries to figure out what her feelings for Leonard are, since she is happy with their relationship, yet she is unsure if she is in love just yet. She confides in Ber ...

On the occasion of the second anniversary of their first date Sheldon and Amy celebrate, however a lonely Raj is invited by Sheldon to join them. Amy is quite upset by Sh ...

As Howard is in the Soyuz space capsule awaiting the launch to the International Space Station, his new wife and their friends are at Leonard and Sheldon's apartment watc ...

With only a few weeks until the launch, Howard's space mission is scrapped due to technical difficulties. Rather than be disappointed, Howard is relieved, since he had al ...

It's two weeks before Howard and Bernadette's wedding. While the gals have a gift bag packing evening while talking about Bernadette's chosen married name and some other ...

Renowned scientist Stephen Hawking is coming to the university for an extended guest lecture series, and an excited Howard has been asked to maintain the equipment on his ...

To show her appreciation for all the free meals she's had at their apartment, Penny, using money from an acting residual check, gives Leonard and Sheldon each a gift: a v ...

Raj comes up with the idea of going down memory lane by the guys having a weekend long gaming marathon like they used to do, this time playing the new game, Star Wars: Th ...

Sheldon's orderly world is thrown into a tailspin when his regular barber, Mr. D'Onofrio, is in the hospital with a coma when Sheldon's regularly scheduled appointment ar ...

With Professor Rothman's retirement - or what could be considered him being forced out due to mental instability - there is a battle in the physics department between She ...

Much to Sheldon's chagrin, President Siebert orders him to take his mandatory vacation time immediately. Sheldon does whatever he can to pretend to take his vacation but ...

As Leonard is feeling sleep deprived because of Sheldon, Leonard is in no mood to have to drive Sheldon to the dentist's office as per the roommate agreement. As such, Le ...

Leonard and Penny have decided to start dating each other again, but Penny is worried that any little glitch in their second time around will stall or halt them getting b ...

After thinking about it long and hard, Leonard decides to ask Penny out on a real date again, which not only garners a shocked reaction from Penny, but the same from the ...

On Sheldon and Amy's scheduled monthly date night, Amy becomes obviously upset with Sheldon. Penny, who witnessed the incident, tells Sheldon that Amy's anger is due to h ...

Out of the blue, Leonard receives a message through his Facebook page from Jimmy Speckerman, a high school acquaintance who bullied him all throughout school. Jimmy wants ...

When Stuart meets Amy as she accompanies Sheldon to the comic book store, Stuart feels they had a moment. As such, Stuart wants to ask her out on a date. Not knowing what ...

A blue jay perched on his apartment window ledge is too much for ornithophobic Sheldon to handle. As no one - even the authorities (gasp) - seems to want to help him shoo ...

While Amy and the guys are eating lunch in the cafeteria, Howard receives a text message from Bernadette about how her wedding and bridesmaids dress shopping is going wit ...