After his and Penny's first date, Leonard is in denial about what Penny's non-committal attitude toward a second date means. In reality and what Penny divulges to Sheldon ...

Leonard does not want to admit that he felt awkward seeing Penny on a date with another man. Leonard states to the guys that he is happy that Penny is moving on with her ...

Penny is having an emotional meltdown about her stay in southern California. She hasn't had an acting job in two years, she hasn't had a raise at the restaurant during th ...

Because of his finding and reporting of a previously unknown planetary object, Raj has been named one of People magazine's 30 Under 30 to Watch. In his usual manner, Shel ...

Leonard is unable to drive Sheldon to work for the next couple of weeks, leaving Sheldon, who refuses to take the bus, to find an alternate ride for the commute. After go ...

Leonard and Sheldon make an orientation presentation to the incoming graduate physics class, most of whom have a deer in the headlights look when listening to Sheldon's s ...

After Penny exposes the guys to it on television, they, excluding Sheldon, have a new passion in life: America's Next Top Model (2003). Specifically, Howard and Raj are t ...

Howard calls the guys into the Mars rover control room on an emergency. He maneuvered the rover into a crevice, and he needs some help from Sheldon and Raj to maneuver it ...

Leonard and Stephanie's budding romance has an unlikely supporter: Sheldon. Being a highly respected physician, Stephanie is the first of Leonard's few girlfriends who me ...

With Leonard now dating Stephanie, Sheldon's hypochondria kicks into high gear. Instead of ensuring Leonard's relationship with her is maintained, Sheldon now takes advan ...

Sheldon is angry at Penny because she bought him a Christmas gift. Sheldon now feels he has to reciprocate and go through the trouble of buying something for someone he d ...

After Howard makes the latest in a long string of inappropriate comments to Penny in what he considers their courting ritual, Penny in return tells Howard in no uncertain ...

Despite being unlikeable, Barry Kripke has someone who wants to be his friend: Sheldon. The only reason Sheldon wants to be his friend is to have access to the open scien ...

Penny is hiding from the building manager since she is behind in her rent due to some unforeseen bills and her hours being cut back at the restaurant. After she borrows m ...

Leonard is dreading a visit from his mother, famed scientific psychoanalyst Beverly Hofstadter. She has always driven Leonard crazy, much like Sheldon does now. It isn't ...

During one of the more quiet moments of a paint-ball tournament where Leslie and Howard are alone in hiding waiting to be killed, they decide to make their final moment m ...

Leonard, Sheldon, Howard and Raj are all taking a train trip to San Francisco to attend a symposium, at where the scheduled keynote speaker is Nobel Prize winning physici ...

Based on a some products that she made previously and sold to friends at a nominal profit, Penny is contemplating starting a home-based business called Penny Blossoms, in ...

In Sheldon's view, the tenants in the apartment directly above his and Leonard's are perfect neighbors since they never make any noise and he doesn't even know them. So h ...

It's Anything Can Happen Thursday, the third Thursday in the month the guys have deemed the day to do something different to get out of their rut. Sheldon proposes that t ...

Although he outwardly considered their relationship friends with benefits and as such had no emotional connotation, Howard is feeling dejected after he is dumped by Lesli ...

Despite how poorly their first and only date ended (albeit the poorness caused by Sheldon), Stuart and Penny are going out on a second date. Not wanting to screw things u ...

Based on work that he has done, Sheldon has been chosen to go on a summer long expedition to the magnetic North Pole. Sheldon is in a conundrum. On the one hand, his work ...