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    The Cast Of "The Big Bang Theory" Then And Now

    This year marks the show's 10th year in production. Time flies!

    Jim Parsons in 2007:

    Jim Parsons in 2017:

    Kaley Cuoco in 2007:

    Kaley Cuoco in 2017:

    Johnny Galecki in 2007:

    Johnny Galecki in 2017:

    Kunal Nayyar in 2007:

    Kunal Nayyar in 2017:

    Mayim Bialik in 2009:

    Mayim Bialik in 2017:

    Simon Helberg in 2007:

    Simon Helberg in 2017:

    Melissa Rauch in 2010:

    Melissa Rauch in 2017: