'The Big Bang Theory' co-creator Chuck Lorre admits that Kaley Cuoco's character Penny was initially 'one-dimensional' and a clichéd 'dumb blonde,' but after several episodes he realized 'there was a brilliance' to her.
Sara Gilbert says that she thinks 'Big Bang Theory' writers 'hit a wall' with her character, Dr. Leslie Winkle, but she would have done more episodes, and would be open to doing the spinoff.