It first aired in 2007 on CBS. Back then, few could've predicted the success of The Big Bang Theory. The show went on for 12 seasons and in truth, the cast didn't anticipate its ending. The likes of Johnny Galecki and Kaley Cuoco anticipated another season, while Jim Parsons had already decided season 12 was his last.

In the following, we'll take a look back at what the atmosphere was like among the cast once the showed aired its final episode. We'll also reveal a special bond Jim Parsons was able to create behind the scenes with a certain co-star. Parsons revealed to spending lots of time with this actor during the show, especially in their dressing rooms off-camera.

Jim admitted he'd miss this actor the most, and that was especially true for their deep conversations behind the scenes.

However, on camera, their dynamic was completely different...

Jim Parsons Admitted The Big Bang Theory Cast Kept Things Light In Their Group Chat After The Finale Aired

Ending The Big Bang Theory after 12 seasons proved to be a controversial decision, given that Jim Parsons hadn't warned some of his co-stars in advance. Nonetheless, it seems like things were able to smoothen over during the last season as it was being shot.

Speaking alongside ET, Parsons revealed the cast kept things casual in their group chat once the finale aired.

"We're not talking about anything out of the ordinary yet! We're still texting about stupid day-to-day stuff, and that's another thing that will be interesting as time goes by. It's like anything else in life when you can't imagine how it's going to be until you get there."

Parsons would go on to reveal at the time that the real change for everyone would come in the fall, when they wouldn't be returning to their normal activity of filming the series.

"It hasn't really hit me yet, completely, that it's over.

Mostly because the way our schedule worked for 12 years, this was an actual break that we had. I'm looking forward to September where I'd normally be working and we'd start airing. That's when I think certain things will start hitting me."

Although Parsons did feel relief, there was a certain cast member he was going to miss, given their close connection behind the scenes.

Jim Parsons Grew Closest To Simon Helberg As The Two Shared Several Moments Together In Their Dressing Rooms

Throughout its 12 season run, The Big Bang Theory cast grew close to one another. Some even dated, including Kaley Cuoco and Johnny Galecki.

Jim Parsons created close connections. However, speaking alongside Metro, there was a certain bond that stuck out, and that was alongside Simon Helberg. Parsons revealed that two spent a lot of time together behind the scenes.

"I'll particularly miss Simon Helberg; we spend a lot of time together, we go back and forth to our dressing rooms, we've talked for almost 12 years now."

Parsons would go on to reveal that he'd miss Helberg, especially six months after the show wrapped up.

The two took on many serious conversations over the years.

"Six months down the road after we finished, I will be like, I haven't talked to Simon in a deep way in a long time. And that will be hard."

As expected, the feeling was a mutual one from Helberg's standpoint.

Simon Helberg Was One Of The Few To Find Out That Jim Parsons Intended On Stopping The Big Bang Theory After Season 12

Jim Parsons faced some backlash from cast members for his decision to step down, without much warning.

However, Simon Helberg took a different approach, stating that Parsons had told him about his decision prior.

"I was aware that Jim felt ready to move on from the show, and we did talk about it. I felt the same. We felt like season twelve was the end of the run."

Helberg went on to discuss that he wasn't pleased with the way Parsons' exit was portrayed. Simon revealed that Parsons was simply honoring his contract, and the purpose wasn't to end the show, that was Chuck Lorre's call.

"In terms of the actual, I guess what you could call the cancelation of the show, that occurred in [that] meeting, where we were informed by Chuck that the show was done.

That's what I found to be the most upsetting."

"Jim didn't cancel our show. Jim just finished the run of our show as we all did, contractually, and no one ever asked us to continue doing the show. That is not an exaggeration," Helberg further stated.

Some might argue that it could've been handled differently, but ultimately, Jim Parsons was just speaking his truth, and was ready to move on - as Helberg was as well.