Sheldon makes a major scientific breakthrough, but he feels it may haunt him for the rest of his career, meanwhile, Howard makes a grand romantic gesture to Bernadette, which causes Penny to put more effort into her relationship with Leonard.
Aspiring actress Penny lands a role on "NCIS" and when things don't go as planned, Leonard steps in to help her, prompting Penny to pose an important relationship question to him. Meanwhile, Sheldon works on becoming funny and Raj steps up his "game" when (more…)
Leonard's purchase of a dining-room table for the apartment doesn't sit well with Sheldon, so much so that it forces him to reevaluate his life. Meanwhile, Bernadette isn't quite over the moon about Howard taking another trip to space.
Things turn rocky between Sheldon and Wolowitz after a barrage of insults, and Bernadette steps in to mediate a peace. Meanwhile, Penny is offered a movie role that may prove embarrassing, and Raj asks Amy to play Cyrano de Bergerac and pen a note to a wom (more…)
Howard and Sheldon tour NASA in Houston and pay a visit to Sheldon's mother, who greets him with a surprise. Meanwhile, back at home, Raj surprises the rest of the gang with a murder-mystery game-playing evening that's not the killer party he expected it t (more…)
Raj and Emily double-date with the Wolowitzes, and Howard becomes flushed with embarrassment after Emily reveals a secret she knows about him. Meanwhile, Sheldon is at loose ends when he believes he's wasted his career trying to prove string theory.
Leonard reinstates "Anything Can Happen Thursday," and it leads the regimented Sheldon to attempt something spontaneous, which creates friction among Penny, Amy and Bernadette. Meanwhile, Raj requests help from Howard in prepping for a date with Emily.
A grief-stricken Sheldon receives counseling from his childhood TV idol, Prof. Proton (Bob Newhart), while Penny and Leonard reach a relationship milestone and turn it into a competition and Bernadette and Amy turn "Star Wars Day" into a special event for (more…)
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- Premiered: September 24, 2007
- Rating: TV-PG
- Premise: Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated. Like the universe after the big bang, the show's popularity expanded, thanks to breakout star Jim Parsons, along with the… (more)