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Katie was the pre-Penny female lead in the Unaired Pilot of The Big Bang Theory produced for the 2006-2007 television season. Katie was played by actress Amanda Walsh, "a street-hardened, tough-as-nails woman with a vulnerable interior". She works at the cosmetics counter of a department store.
Kate is found by Sheldon and Leonard on the curb crying and left homeless by her former boyfriend. Leonard, despite Sheldon's objections, invites her to dinner and then to stay a few days at their apartment. She is abrasive, sexy, hard, and sarcastic, but she softens a little when she discovers that the guys aren't trying to get something from her. In the end, she decides she'll crash at their place for a while.
Katie goes out drinking and arrives back at the apartment late at night, waking Leonard by smashing a lamp. Katie starts ranting to Leonard about her life and why it sucks, using the whiteboard, drawing colorful diagrams to explain her point. Leonard upsets her by suggesting her problems weren't caused by her mother, boyfriend, etc., but by her making stupid decisions. As a result, she moves out.
The next morning while Katie is serving a customer in the department store, Leonard comes to apologize. Katie later takes her things back to their apartment and says that staying there is her only rent-free choice. She then takes Leonard, Sheldon and Gilda out dancing.
The audience did not like the way Katie was mean and mocking Sheldon and Leonard, so she was dropped for the second pilot and replaced by Penny who is sweet and caring. Penny does exhibit some of these mean and mocking traits when she gets really mad at people.
- Mother: Barbara
- Stepfather: Henry
- Katie: (sees Leonard holding a green light saber replica.) Okay, if that thing vibrates, I'm gonna need to borrow it.
- Katie: Ipso facto, I drink 'til I'm flatso!