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A friend of the guys who works at the comic book store, Stuart (Kevin Sussman) hits it off with Penny, prompting Leonard and Wolowitz to head out to ladies' night at a local bar.
Penny gets jealous of the guys' new sexy female neighbor (Valerie Azlynn)
The boys help Penny with her new business selling Penny Blossoms.
On a train ride to San Francisco, Leonard, Sheldon, Wolowitz, and Raj discover that Summer Glau is on their train ride.
A paintball game leads to a fight between Penny and Sheldon, but also for a romance between Wolowitz and Leslie!
Leonard's mother, Mrs. Hofstadter (Christine Branksi) comes into town and she ends up being exactly like Sheldon.
Sheldon lends Penny some money which makes Leonard go and try and collect some money from her ex-boyfriend Kurt for her.
In order to get time on the super computer at work that he needs for his experiment, Sheldon must befriend Kripke who is in charge of the device.
When Penny's comments about Wolowitz's love life sends him into depression, the boys are about to lose their most important teammate in an upcoming robot fighting competition.
It's Christmas time and Sheldon is annoying everyone with his theories on gift giving etiquette. Meanwhile, Leonard gets jealous when Penny stars dating one of his handsome co-workers.