Immediately upon the guys' arrival back from the three month long Arctic expedition, Leonard, Howard and Raj make a confession to Sheldon about their participation in She ...

After hearing a cricket chirping, Howard and Sheldon make a wager, the winner to get one of the other's favorite comic books. Their wager is on whether the cricket is a c ...

Now that Leonard and Penny are dating, which means that Penny will be at the guys' apartment more often, Sheldon and Penny have to come to an understanding on how to get ...

It's Columbus Day and Thanksgiving is approaching, but Raj in particular is not in a thankful mood. His research stalled six months ago with no hope of success. With no j ...

Howard reminds Leonard of a five year old pact between the two. Effectively, the pact stipulates that Penny has to set Howard up with one of her friends. Leonard has to t ...

To chase after a woman with whom he had no chance - again - Howard leaves Raj at a critical moment during a kite flying challenge against Sheldon and Leonard. This is the ...

An argument between Leonard and Penny proves inconvenient to Sheldon. Written by CBS Publicity ...

While Leonard, Howard and Raj are off camping to observe the Leonid meteor shower, Sheldon is at home doing work. It's lucky for Penny that Sheldon did stay behind as she ...

After their third date, Bernadette wants an understanding with Howard about where their relationship is heading before proceeding to the next step of sex. Howard is unsur ...

When Bernadette joins the guys and Penny for their usual Chinese take-out dinner, Bernadette, the microbiologist, becomes fascinated with Leonard's physics project. Both ...

It's approaching Christmas, and Leonard's mother is coming for a visit, something Leonard fails to tell Penny. Sheldon surmises it's because Beverly Hofstadter will not a ...

With Leonard and Howard going on a double date, Raj talks a reluctant Sheldon into attending a mixer at the university. Surprisingly, Raj and Sheldon end up meeting and h ...

Sheldon and Leonard's apartment is robbed. Leonard takes the incident in stride, but Sheldon has an extreme reaction to his space being violated and his possessions stole ...

Sheldon can't sleep since he is totally preoccupied with solving a physics graphine problem. By association, Leonard and Penny can't sleep since Sheldon is continually bo ...

Valentine's Day is approaching. Leonard thinks he's hit some good luck in that he has been asked to attend a conference and view the Hadron super collider in Switzerland ...

With only a learner's permit in his possession and not even owning a car, Sheldon is summoned to traffic court after he is caught speeding by a traffic camera. He was dri ...

Leonard, Sheldon, Howard and Raj jointly purchase a box, whose contents are unknown, for $60 at a garage sale. While sorting through it, they find that it contains primar ...

Sheldon is this year's recipient of the college's Chancellor's Award for Science. He is surprised at being named the winner, but he believes he has been the deserving rec ...

The guys and Penny have a friendly but wagered bowling match against Stuart and his team. The match gets a little heated when one of Stuart's regulars can't make it, the ...

One of the consequences of Penny and Leonard breaking up is that Sheldon now has mixed allegiances. Leonard is his best friend and roommate, but he wants to remain friend ...

Sheldon's brilliant pen pal friend, renowned quantum cosmologist Dr. Elizabeth Plimpton, is being wooed by Cal Tech. Sheldon invites her to stay with him and Leonard whil ...

After Leonard and Sheldon have a heated argument about what Sheldon sees as Leonard making a major breach in the roommate agreement, Leonard takes refuge at Penny's apart ...

Penny and Leonard are still at the stage of their post-coitus relationship where they feel awkward doing friend type things together. Regardless, when the guys experiment ...