
Sheldon’s answers during an FBI interview put Wolowitz’s security clearance in jeopardy.
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
An embarrassing secret of Wolowitz’s comes to light, while Sheldon and Raj have a small war at work.
The guys are concerned as Sheldon searches for an alternative to human companionship.
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
Penny tags along on Sheldon’s first ever date; Wolowitz finds a new use for a robotic arm.
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon’s perfect match online.
Leonard tells Penny about how he met Sheldon for the first time…and what happened to the elevator.
Leonard and Sheldon compete for the attention of a famous female physicist.
When Leonard and Penny aren’t speaking, Sheldon goes to extremes to keep them both happy.
A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
Sheldon’s friends come to his aid when his fear of public speaking stands between him and a coveted award.
When the guys find a ring from « The Lord of the Rings » at a garage sale, it threatens to tear them apart.
Sheldon winds up in traffic court when he gets a ticket because of Penny.
Leonard can only bring one guest on a trip to see CERN’s Large Hadron Collider (the world’s largest and highest energy particle accelerator) in Switzerland on Valentine’s Day.
Sheldon’s search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
Leonard is aghast to find out a secret of Penny’s: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.
A Christmas visit from his mother has Leonard discovering she’s kept a lot of news from him that she shares with Sheldon and worrying if she’ll approve of his romance with Penny.
Penny gets help from Sheldon in order to understand what Leonard’s work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
After he’s humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.