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After 12 seasons, The Big Bang Theory is signing off for good. 1 / 8
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Over its 12-year run, the show has changed a lot. 2 / 8
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It started out as a series about four geeky characters and their attractive neighbor. 3 / 8
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However, as time went on, the cast grew to include Amy and Bernadette. 4 / 8
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Their inclusion changed the very DNA of the show, transforming it into an ensemble. 5 / 8
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Their presence also allowed the five original characters to evolve. 6 / 8
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The series then became a fun show about love, friendship and adulthood. 7 / 8
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The Big Bang Theory's series finale will air May 16 on CBS. 8 / 8
CBR
