Penny wasn’t in the pilot for The Big Bang Theory. The first woman in the lead role didn’t work, so she was replaced. Penny on The Big Bang Theory was very different, but the show’s people changed her. Kaley Cuoco was the only female lead for the first three years. Jim Parsons, Johnny Galecki, Simon Helberg, and Kunal Nayyar play the roles (Raj). Bernadette and Amy didn’t join The Big Bang Theory until season 4. This meant that there were more women on the show. In the first episode of 2007, Penny, the show’s main character, makes her debut. Penny moved into Apartment 4A after she met Howard and Raj. Sheldon and Leonard see that Apartment 4B has a new neighbour. Leonard is in love with her and invites her over, even though his roommate doesn’t like the idea.
