"We did the very clichéd, in the beginning, goofy blonde who says foolish things," Lorre says of the character Penny.

Chuck Lorre knows Penny was "one-dimensional" and "clichéd" in the early days of the hit sitcom, but after several episodes he realized "there was a brilliance" to her.Figuring out Kaley Cuoco's bubbly character Penny may have been more difficult than quantum physics for the guys behind The Big Bang Theory.

W hen The Big Bang Theory first aired in 2007, few could have imagined the massive success it would achieve. Over the course of twelve seasons, the show became one of the most pop