'Big Bang Theory' Premiere: Everything You Need to Know About Sheldon and Amy's Future -- Including Chances of

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Our whole universe was in a hot dense state, then nearly 14 billion years ago expansion started. Wait...

After nearly a decade on the air, true Big Bang Theory fans know all the lyrics to that beyond-catchy theme song -- and they also should know that season nine of the hit CBS comedy premieres tonight!

To get you prepared for what's next after those relationship bombshells in the season eight finale, ET hit the Big Bang set to catch up with stars Jim Parsons and Mayim Bialik.

Plus, we called up executive producer -- and keeper of all the secrets -- Steve Molaro to get your exclusive scoop on what's coming up next for our beauty and geek in season nine.


WATCH: Sheldon & Amy's 'Rough' Break Up and If They'll Make Up!

Molaro confessed to ET that their goal for season nine is to keep the show "fresh, fun and funny" and one of the ways to do that was to throw an understandable wrench into Sheldon and Amy's relationship.

"I understand where Amy was at," the show runner explained. "I think she loves him and she knows that he loves her in whatever way he's capable of, but they've been together for over five years. And if it's your fifth anniversary night, and you're making out -- because that's all you do -- and the person you're making out with is really only thinking about The Flash TV show, that's the thousandth straw on that camel's back.

Molaro continued, "It may make you want to take a step back and be like, 'I care about this guy lot but am I doing the right thing long term for myself?'"

And while Amy is struggling to figure out if she wants to continue with relationship agreement, this shakeup will be especially frustrating for Sheldon because "he cannot apply science and logic to get an answer" in order to fix things.

"It has really opened up some really interesting colors for Jim to play that we've just never seen before and I think that we've been having a lot of fun with that," Molaro teased.


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But we can always count on our little Shelly to reach out to his Mom -- played by fan favorite Laurie Metcalf -- at the most difficult times of his life. "I think she loves her Shelly very much and she just wants him to be happy and she's there for him," the EP explained.

As for the actors in real life? When we asked how the Big Bang stars would have changed the season eight finale, Parsons' answer was both sweet and unexpected: "Well, I mean, looking at it from today's lens, I wish we were married," the actor spilled with a smile. "I mean, I don’t know if that would've been a very good place for the show to go though."

Parsons continued, "I do think we must be waiting on Sheldon to come to a better realization of not only that Amy is important to him, but specifically why. He will maybe be able to express that to her and maybe alter his behavior a little bit more to make her more inclined to want to continue."

And, of course, we had to ask about the sexy elephant in the room! After five years of dating (and breaking up) is our chance for some Sheldon and Amy coitus completely out of the question? "I think if the rift was about that specifically, I think we could work with coitus as a potential," Bialik spilled. "It may be part of the rift. But it’s not the rift... I don’t think we're going to have like what most other TV shows do when couples get back together."

Season nine of The Big Bang Theory premieres tonight at 8 p.m. on CBS.