In September 2007, Cuoco began starring in the CBS sitcom The Big Bang Theory, playing Penny, a Cheesecake Factory employee and aspiring Actress who lives across the hall from physicists Dr. Leonard Hofstadter and Dr. Sheldon Cooper. Prior to the 2010–2011 season, she earned $60,000 an episode for the series, the same as her co-stars. In 2010, the cast negotiated a raise for each actor to make $200,000 per episode. On September 13, 2010, she broke her leg in a horse-riding accident and missed two episodes of the series. In late October 2012, Cuoco enlisted the help of her sister Briana to organize a flash mob on the set of the show, in which she and the cast and crew surprised the studio audience by suddenly lip syncing and dancing to Carly Rae Jepsen's song "Call Me Maybe". A video of the event was posted on YouTube and became a viral success. A clip from the performance was also played during Cuoco's January 8, 2013 appearance on the late night talk show Conan. As of August 2014, Cuoco and her co-stars from The Big Bang Theory Johnny Galecki and Jim Parsons, each earn an estimated $1 million per episode.

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