Season 2 Episode 23 - The Monopolar Expedition
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.
Leonard and Raj take Wolowitz to Las Vegas to help him get over his break-up with Leslie. Sheldon, home alone and looking forward to it, locks himself out and has only one other place to stay—Penny's.
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Penny feels threatened when another sexy woman moves into the apartment building.
Penny's business selling hair products out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge.
The guys' trip to San Francisco takes a detour once they learn that actress Summer Glau (appearing as herself) is on their train. Astrophysicist George Smoot also has a cameo.
Paintball leads to a squabble between Sheldon and Penny, as well as romance between Howard and Leslie.
Leonard suffers through a dreadful visit from his mother (Christine Baranski) that ends up bringing him and Penny closer.
When Sheldon comes up with a plan to fix Penny's finances, it leads to Leonard coming face-to-face with her ex, Kurt.