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Leonard, Penny and Stuart
Watch The Big Bang Theory Season 2 Episode 20
"The Hofstadter Isotope"
Original Air Date:

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.

Raj Talks to Alicia
Watch The Big Bang Theory Season 2 Episode 19
"The Dead Hooker Juxtaposition"
Original Air Date:

Penny gets jealous of the guys' new sexy female neighbor (Valerie Azlynn)

Leonard Plays Laser Obstacle Chess
Watch The Big Bang Theory Season 2 Episode 18
"The Work Song Nanocluster"
Original Air Date:

The boys help Penny with her new business selling Penny Blossoms.

Wolowitz and Summer Glau
Watch The Big Bang Theory Season 2 Episode 17
"The Terminator Decoupling"
Original Air Date:

On a train ride to San Francisco, Leonard, Sheldon, Wolowitz, and Raj discover that Summer Glau is on their train ride.

Wolowitz and Winkle!
Watch The Big Bang Theory Season 2 Episode 16
"The Cushion Saturation"
Original Air Date:

A paintball game leads to a fight between Penny and Sheldon, but also for a romance between Wolowitz and Leslie!

Sheldon and Mrs. Hofstadter Sing
Watch The Big Bang Theory Season 2 Episode 15
"The Maternal Capacitance"
Original Air Date:

Leonard's mother, Mrs. Hofstadter (Christine Branksi) comes into town and she ends up being exactly like Sheldon.

Leonard Uses the Board
Watch The Big Bang Theory Season 2 Episode 14
"The Financial Permeability"
Original Air Date:

Sheldon lends Penny some money which makes Leonard go and try and collect some money from her ex-boyfriend Kurt for her.

Sheldon Goes Rock Climbing
Watch The Big Bang Theory Season 2 Episode 13
"The Friendship Algorithm"
Original Air Date:

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.

The Boys and MONTE
Watch The Big Bang Theory Season 2 Episode 12
"The Killer Robot Instability"
Original Air Date:

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.

Penny Meets Dave
Watch The Big Bang Theory Season 2 Episode 11
"The Bath Item Gift Hypothesis"
Original Air Date:

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.

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TBBT Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.