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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.

Season 2 Episode 22 - The Classified Materials Turbulence

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.

Season 2 Episode 21 - The Vegas Renormalization

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.

Season 2 Episode 20 - The Hofstadter Isotope

A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

Season 2 Episode 19 - The Dead Hooker Juxtaposition

Penny feels threatened when another sexy woman moves into the apartment building.

Season 2 Episode 18 - The Work Song Nanocluster

Penny's business selling hair products out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge.

Season 2 Episode 17 - The Terminator Decoupling

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.

Season 2 Episode 16 - The Cushion Saturation

Paintball leads to a squabble between Sheldon and Penny, as well as romance between Howard and Leslie.

Season 2 Episode 15 - The Maternal Capacitance

Leonard suffers through a dreadful visit from his mother (Christine Baranski) that ends up bringing him and Penny closer.

Season 2 Episode 14 - The Financial Permeability

When Sheldon comes up with a plan to fix Penny's finances, it leads to Leonard coming face-to-face with her ex, Kurt.

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