Penny has just broken up with her latest boyfriend Mike who blogged about their sex life. Besides feeling embarrassed about the blog contents, she's angry with herself fo ...

Penny wishes Leonard a happy birthday which she knows is this upcoming Saturday, when she expects him to at least come in for his free piece of birthday cake at the resta ...

The guys are surprised to see a beautiful young woman in Sheldon's office. They are even more surprised when they learn that she is Sheldon's fraternal twin sister, Missy ...

Leonard buys a replica time machine online. As the boys move it into the apartment they accidentally make Penny late for work causing her to lash out at Leonard for his n ...

With the perennial winning team not participating this year, Leonard, Howard and Raj feel that their foursome are the sure winners of this year's edition of the universit ...

Fifteen year old genius Dennis Kim is a physics doctoral candidate who Gablehauser wants at the college at any cost. Dennis is much like Sheldon was at that age, with the ...

Germaphobe Sheldon is more hyper-vigilant than ever after Penny comes back from Nebraska where she was visiting with family who were sick with an unknown bug. Regardless, ...

Penny has the role of Mimi in a one-day workshop stage production of Rent, and asks Leonard and Sheldon if they want to go see her perform. Based on hearing Penny sing ba ...

Leonard finds a letter in the trash can, the letter an invitation for him and Sheldon to speak at an upcoming conference on the topic of their latest joint research findi ...

Raj's parents back in New Delhi have set him up with a childhood acquaintance of his named Lalita Gupta, who has just moved to California. Their plan is for the two to ge ...

Penny receives an unwanted visitor from Nebraska named Christy. In Penny's eyes, Christy is a loose woman with no morals. Hence, Christy is ripe for the picking by Howard ...

When Penny asks the guys to her party, which will include dancing, they seriously think about not attending as they aren't dance people. But when they learn it's a costum ...

When Leslie Winkle asks Leonard to join the faculty string quartet, he has no idea that it may lead to more personal endeavors, especially as their first and only experie ...

Sheldon isn't looking forward to the faculty mixer where he will meet his new boss, Dr. Eric Gablehauser, who Sheldon doesn't respect. Due to an inappropriate comment to ...

Leonard is still pining over Penny, but comes to the realization that she is out of his league when he sees her with her handsome latest date. Moving on, Leonard decides ...

Penny asks a favor of Leonard and Sheldon: to let the furniture delivery men into her apartment when they make the delivery of her recent purchase. She gives them a key t ...

Twenty-somethings Leonard Hofstadter and Sheldon Cooper are friends, roommates and physics geniuses working at Cal Tech. As such, they are self-professed geeks. Their soc ...