CBS says it's renewing its hit comedy "The Big Bang Theory" for three more years.
The extraordinary three-year deal would carry TV's most-watched sitcom through the 2016-2017 season, the series' 10th on the air.
"The Big Bang Theory" premiered in September 2007 and has been a ratings smash for virtually its entire run. It has averaged nearly 20 million viewers each week this season.
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A comedy about science nerds and the people who love them, it stars three-time Emmy-winner Jim Parsons as well as Johnny Galecki and Kaley Cuoco-Sweeting.
It airs Thursday at 8 p.m. Eastern time.