This image released by CBS shows, from left, Simon Helberg, Melissa Rauch, Mayim Bialik and Jim Parsons in a scene from "The Big Bang Theory." CBS says it's renewing its hit comedy "The Big Bang Theory" for three more years. This extraordinary deal would carry TV's most-watched sitcom through the 2016-2017 season, the series’ tenth on the air. "The Big Bang Theory" premiered in September 2007, and has been a ratings smash for virtually its entire run. This season it has averaged nearly 20 million viewers each week. (AP Photo/CBS, Michael Yarish)
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