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

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

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