'The Big Bang Theory' Cast: Then and Now Photos Revealed

Sheldon Cooper - Jim Parsons

Actor Jim Parsons may have seen more wide-ranging success than anyone thanks to The Big Bang Theory. The actor now has his hands in many ventures, including TV and short films. He also sees profits from the spinoff, Young Sheldon, as it is based on the character he helped create.

"I feel very proud of the work we do," Parsons told Variety about the show. "I love coming here, and one of the more astonishing things … is how enjoyable it still is, to do this job, at a very visceral level as an actor, this far in."

Leonard Hofstadter - Johnny Galecki

Johnny Galecki reinvented himself as Leonard Hofstadter on The Big Bang Theory in 2006, and then fittingly returned to his roots as David on the Roseanne reboot last year. The actor is also a passionate musician, and will undoubtedly be on screen again in the future. However, when asked what the future holds by PEOPLE, he said that he has been too emotional to think that far ahead.

"The only manner in which the cast has discussed wrapping [The Big Bang Theory] has been that we're all going to be very sad when that day comes," he said. "But I think at this point everyone's very comfortable with 12 seasons being a good time to go home and see our families."

Penny Hofstadter - Kaley Cuoco

For many people, Penny was the relatable character that gave them access to the nerd world of The Big Bang Theory in the beginning, and now she is a part of it. Actress Kaley Cuoco got married in real life last year, and has spent as much spare time as possible on horseback since. She, too, was not ready to start planning for life after the series.

"I can't really picture it. And I don't think there really will be my life without it — I think it'll always be there, I think it'll always be running, I think we'll always have those fans. It's always going to be a part of me," she said.

Raj Koothrappali - Kunal Nayyar

Perhaps no character has grown more than Raj Koothrappali over the course of the series, going from a socially anxious scientist who was physically incapable of speaking to women to a functioning adult. In his interview, actor Kunal Nayyar said that he has grown on the show as well.

"I grew up on this show — I was a kid out of grad school. I don't even know how to comprehend that," he said.

Bernadette Rostenkowski - Melissa Rauch

After her introduction in Season 2, Bernadette quickly became a mainstay of the show, as it was clear the ensemble needed another female presence. Thankfully, Melissa Rauch was just right for the job, able to dish out punchlines as well as her co-stars.

Rauch has become fully integrated into the cast outside of work as well. She told reporters that she cherishes their friendship.

"A lot of us hang out. It's just a close-knit group. Kaley is the best at throwing parties. Mayim's the deep thinker, and Kunal is a big giggler. We all get along, and it's a nice family feel," she said.

Amy Farrah Fowler - Mayim Bialik

Actress Mayim Bialik is more qualified to be on The Big Bang Theory than any of her co-stars. In real life, she is a trained neuroscientist, and she admitted that she is a bit similar to her character in real life.

"I was pretty studious, so I can relate to Amy a lot. I was actually a late bloomer to science and became interested when I was 15 while working on Blossom and had a tutor with a real passion for science," she said.

Ensemble

Finally, the cast is known for its iconic group shots, usually piled onto living room furniture with take-out containers in hand. Fittingly, there were plenty of those in the last season, sending the gang off in style.