See How the ‘Big Bang Theory’ Cast Has Changed Over 12 Seasons (PHOTOS)
Sheldon Cooper
Played by: Jim Parsons (Season 1)
Sheldon Cooper
Played by: Jim Parsons (Season 12)
Penny
Played by: Kaley Cuoco (Season 1)
Penny
Played by: Kaley Cuoco (Season 12)
Leonard Hofstadter
Played back: Johnny Galecki (Season 1)
Leonard Hofstadter
Played by: Johnny Galecki (Season 12)
Howard Wolowitz
Played by: Simon Helberg (Season 1)
Howard Wolowitz
Played by: Simon Helberg (Season 12)
Rajesh Koothrappali
Played by: Kunal Nayyar (Season 1)
Rajesh Koothrappali
Played by: Kunal Nayyar (Season 12)
Amy Farrah Fowler
Played by: Mayim Bialik (Season 3)
Amy Farrah Fowler
Played by: Mayim Bialik (Season 12)
Bernadette Rostenkowski-Wolowitz
Played by: Melissa Rauch (Season 3)
Bernadette Rostenkowski-Wolowitz
Played by: Melissa Rauch (Season 12)
The Big Bang Theory has begun its 12th and final season.
The CBS comedy series premiered September 24, 2007, and now, after over a decade on TV, the cast looks a little different than when the show first aired.
From costumes to haircuts, the show’s leads — Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik and Melissa Rauch — certainly have changed, but the laughs are just as fresh.
Click through the gallery above to see how each actor grew up right before our eyes.
The Big Bang Theory, Thursdays, 8/7c, CBS
