After her first date with Leonard, Penny feels insecure about her lack of academic accomplishment, putting her relationship with Leonard on the fence.
Penny decides not to date Leonard, who in turn begins a relationship with Leslie Winkle, which ends quickly due to philosophical differences.
Frustrated by her failures in life, Penny becomes obsessed with playing 'The Age of Conan.' Sheldon creates an online dating profile for her.
Rajesh is being honored by People Magazine's '30 under 30' for his discovery of a new planetary body. Raj gets cockier and cockier alienating his friends from him.
When Leonard temporarily works nights, Sheldon is left without a chauffeur.
After speaking at a student seminar, Sheldon finds himself with a groupie, Ramona Nowitzki.
Penny is now a member of the group, meaning that she must obey the house rules. After her third strike, Sheldon banishes her. War breaks out between Sheldon and Penny.
Howard finds himself in trouble when he picks up a woman and takes her to the Mars Rover control room.
Sheldon tries to help move Leonard's new relationship with Stephanie along, because Leonard's track record with women has been less than successful.
Leonard is the last one to realize that Stephanie has moved in with him. And when he finds out, he becomes worried that they are moving too fast.
Much to Leonard's disappointment, Penny suddenly develops an interest in science when a sexy new physicist joins the lab. Meanwhile, Sheldon struggles to find Penny an x-mas gift.
Howard becomes depressed after Penny makes a cruel statement about his love life, while the rest of the guys prepare for a killer robot duel against Barry Kripke.
Sheldon tries to make friends with a despised colleague with the hopes that it will get him access to a coveted computer in the lab. Sheldon learns how to rock climb via the web.
Penny can't afford to pay her rent, so Sheldon and Leonard each come up with unique ways to help her out.
Sheldon hits it off with Leonard's psychoanalyst mother, but she drives Leonard and Penny to the bottle.
Howard hooks up with Leslie, while Penny accidentally ruins Sheldon's spot on the couch with a paintball gun.
On a train trip to San Francisco, for a convention, the boys debate on how to meet sci-fi star Summer Glau, who is on board with them.
Sheldon's assistance with Penny's home-based business (Penny blossoms) leads to disaster.
Penny becomes jealous when a gorgeous new neighbor attracts the guys' attention threatening Penny's status as 'Queen Bee'.
Leonard is so upset when a friend from the comic book store begins dating Penny that he convinces Howard and Raj to take him to a bar so that he can pick up a woman of his own.
After being dumped by Leslie, Howard heads to Las Vegas with Leonard and Raj, leaving Penny to deal with Sheldon, who has locked himself out of the apartment.
Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his NASA projects.
Penny gets upset when she finds out Leonard and the guys plan to work at the North Pole for the summer.
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