For 12 seasons, Kaley Cuoco starred on The Big Bang Theory as Penny, the sunny heroine who tolerated her weird neighbors rambling endlessly about Star Trek or Magic: The Gathering.
But according to Cuoco, the character of Penny was originally conceived very differently, as a "dark, brooding unhappy woman," which — while an admittedly unconventional choice for a breezy sitcom — makes a lot more sense for a woman stuck hanging out with those guys for 12 years. Read more at Yahoo Entertainment.