Watch The Big Bang Theory Season 1 Episode 15 online via TV Fanatic with over 1 options to watch the The Big Bang Theory S1E15 full episode. Affiliates with free and paid streaming include iTunes.
The guys meet Sheldon's extremely attractive twin sister Missy (Courtney Henggeler) who is in town for a wedding.
Sheldon: You see, I'm a superior genetic mutation, an improvement on the existing mediocre stock.
Missy: And what do you mean, "mediocre stock?"
Sheldon: That would be you
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Leonard: So, how do you two know each other?
Missy: He once spent nine months with my legs wrapped around his head.
Leonard: Excuse me?
Sheldon: She's my twin sister. She thinks she's funny, but frankly, I've never been able to see it.
Missy: That's because you have no measurable sense of humor, Shelly.
Sheldon: How exactly would one measure a sense of humor? A "humormometer?"
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