Jim Parsons, The Big Bang Theory, Then and Now

CBS/Warner Bros. Entertainment

We're just one day away from the series finale of The Big Bang Theory.

After 12 seasons, the beloved CBS sitcom—starring Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Melissa Rauch and Mayim Bialik—will come to an end on Thursday, May 16. As we prepare to say goodbye to the cast of the hit series, we're looking back at photos of the actors during their first season and last seasons.

It's been over a decade since the show premiered, and we've all grown up with the characters on the show. So, as a farewell, let's see how everyone has changed over the years!

Take a look at the cast of The Big Bang Theory, then and now, below!

Johnny Galecki, The Big Bang Theory, Then and Now

CBS/Warner Bros. Entertainment

Jim Parsons, The Big Bang Theory, Then and Now

CBS/Warner Bros. Entertainment

Kaley Cuoco, The Big Bang Theory, Then and Now

CBS/Warner Bros. Entertainment

Kunal Nayyar, The Big Bang Theory, Then and Now

CBS

Simon Helberg, The Big Bang Theory, Then and Now

CBS/Warner Bros. Entertainment

Melissa Rauch, The Big Bang Theory, Then and Now

CBS/Warner Bros. Entertainment

Mayim Bialik, The Big Bang Theory, Then and Now

CBS

Be sure to watch the series finale of The Big Bang Theory on Thursday, May 16 on CBS.

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