These Before And After Pics Of "The Big Bang Theory" Cast Show Just How Much Has Changed On The Series
12 years later...
After 12 long years, The Big Bang Theory is coming to an end, making it the longest-running multi-camera sitcom in TV history.
In honor of the series finale, here's a look back at the cast:
Kaley Cuoco as Penny
Jim Parsons as Sheldon Cooper
Johnny Galecki as Leonard Hofstadter
Kunal Nayyar as Rajesh Koothrappali
Simon Helberg as Howard Wolowitz
Melissa Rauch as Bernadette Rostenkowski-Wolowitz
Mayim Bialik as Amy Farrah Fowler
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