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When Sheldon gets news he's going to the North Pole on a NSF expedition, he invites the guys as his group.
Howard enlists the help of the boys in order to fix his space toilet. Stuart and Penny go on their second date.
When Wolowitz gets dumped by Leslie, Raj and Leonard take him to Las Vegas to get over his breakup. Meanwhile, Sheldon gets locked out of the apartment and has to crash at Penny's.
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.