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The Big Bang Theory Cast: Then and Now See how the cast has changed over the past decade.
Posted on Oct 23, 2018 09:10am

It's hard to believe The Big Bang Theory has been on the air for 12 seasons. It seems like just yesterday that Penny moved in across the hall from Apartment 4B and befriended reclusive scientist Sheldon Cooper. Fast-forward more than a decade, and members of the gang have coupled up, said their "I do's" and started families of their own. Time sure does fly when you're having one halogen of a good time!

Take a look back at how the beloved TBBT characters have evolved by clicking on the flip cards below.



Watch all-new episodes of The Big Bang Theory on Thursdays at 8/7c on CBS and CBS All Access.