Wolowitz shows up in an awfully feminine robe after sleeping with Penny's friend and forcing Penny to crash on Leonard and Sheldon's couch.
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Penny joins the boys for a game of Halo and they're a little shocked that she's not bad at the game.
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A picture of Leonard and Penny kissing in costume after Penny's ex-boyfriend is a jerk to Leonard at her Halloween Party.
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After Leonard leaves the party embarrassed by what her jerk of an ex said, Penny comes over to comfort Leonard. She's dresses as a kitten.
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The boys go to eat dinner at the restaurant where Penny works as a waitress and she serves the guys.
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When Sheldon discovers a necktie on Leonard's door he runs to Penny to find out what it means. Penny explains to the clueless nerd.
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Leonard goes out with just Penny on a dinner date that Penny originally thought was going to be a group dinner.
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Penny fits right in with the gang as they sit down to eat their signature food... Chinese takeout.
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Penny meets Raj and Wolowitz in the pilot episode of The Big Bang Theory. Wolowitz will begin his lifetime of sleazily hitting on her while Wolowitz is unable to talk to her.
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Sheldon and Leonard are about to experience a new life now that Penny moved in next door. By Sheldon and Leonard we really mean Leonard.
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Kaley Cuoco stars in the Big Bang Theory as Penny, the attractive next door neighbor of the boys. Penny is an aspiring actress that works at the local Cheesecake Factory.
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TBBT Quotes

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.

Sheldon: Why are you crying?
Penny: Because I'm stupid!
Sheldon: Well that's no reason to cry; one cries because one is sad. For example, I cry because others are stupid and it makes me sad.