Raj and Howard register Sheldon with an online dating site and find his perfect female...
The comedy flashes back to reveal how Sheldon saved the lives of his pals, and looks at the...
Sheldon invites a famous physicist to the flat after befriending her online, but is put out to...
Sheldon tries to hide the fact he had dinner with Penny after she broke up with Leonard, hoping...
Leonard tells Penny he loves her, but fails to get the response he would have liked. Sheldon...
Sheldon is awarded a prestigious prize by the university and worries about the speech he will...
The friends fight over a ring they believe was used in The Lord of the Rings film trilogy....
Sheldon misses an opportunity to meet Spider-Man co-creator Stan Lee when he has to go to court...
Leonard is invited to visit the Large Hadron Collider in Switzerland and asks Penny to join him...
Sheldon develops a mental block and has difficulty working on a formula, so in a move inspired...
Leonard and Sheldon's flat is burgled, so they work on a state-of-the-art security system in a...
Raj lusts after a girl he and Sheldon meet at a university party, and Leonard comes to regret...
Leonard's mother visits and he is horrified to learn that Sheldon knows more than he does about...
Bernadette asks Leonard about his physics experiment, making Howard so jealous that she...
Howard's fear of commitment causes him to avoid Bernadette, but he soon realises he has made a...
Leonard, Raj and Howard go camping to watch the Leonid meteor shower, but the trip takes an...
A jealous Leonard argues with Penny when she invites one of her male friends to stay at her...
Leonard worries his lack of American football knowledge is alienating him from Penny and her...
Sheldon is given the chance to square off against the one actor from the Star Trek franchise he...
Raj accepts Sheldon's offer to work for him as he is desperate to avoid being sent back to...
Sheldon succeeds in getting Penny to conform to his high standards, so Leonard adopts a similar...
Sheldon and Howard stake their most coveted comic books on a bet over the species of a cricket,...
Sheldon returns to Texas in disgrace when he discovers his friends tampered with the Arctic...