From geeky beginnings to global fame, the cast of The Big Bang Theory grew into icons who captured our hearts and made us laugh for over a decade. But now, nearly two decades later, the question is: how have they aged, and which star has changed the most? Stay tuned as we reveal the transformations of your favorite characters—from Raj’s shy awkwardness to Sheldon’s genius charm—plus the tragic loss of a beloved star. Let’s take a look at the Big Bang Theory cast then and now, as you’ve never seen them before...