• 'The Big Bang Theory' will finally be introducing Penny's mom in Season 10's premiere episode.

'The Big Bang Theory' will finally be introducing Penny's mom in Season 10's premiere episode. (Photo : Getty Images/Matt Winkelmeyer)

"The Big Bang Theory" season 10 cast have already started filming for their upcoming episodes.

Just recently, Kunal Nayyar shared a photo of their script that was written by Chuck Lorre, Eric Kaplan and Jim Reynolds. The 208th episode from the hit CBS show was directed by Mark Cendrowski. Unfortunately, the actor covered the title of the script with an orange Sharpie.

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Meanwhile, even though the title for episode 1 hasn't been revealed yet, executive producer Steve Molaro already shared some information from the premiere episode.

While speaking with TV Line, Molaro confirmed that "The Big Bang Theory" guest stars Katey Sagal and Jack McBryer will both be featured in the premiere episode. In the after math of Sheldon's (Jim Parsons) mom Mary and Leonard's (Johnny Galecki) dad Alfred's "sexcapade," Penny will pick up her mom Susan and brother Randall from the airport to attend her union with Leonard.

The awkward encounters will begin the minute the trio is in the car traveling back to the wedding venue.

"We love Katey and this isn't the first time we thought of having her on the show playing other roles. We talked to her about a role in the past and that didn't work out. But her name has been floating around and we love her. And we thought it's time to meet Penny's mom and I talked to her," Molaro said while at the 2016 San Diego Comic Con.

In other news, it seems that season 10 isn't the time for Howard's (Simon Helberg) dad to be introduced in the hit CBS TV show. The actor previously said that if it were up to him, he would introduce Howard's dad in the upcoming episodes. However, this doesn't mean that big things aren't in store for the character. Howard and Bernadette (Melissa Rauch) are expecting their first child together.

"The Big Bang Theory" season 10 will premiere on CBS on Sept. 19 at 8 p.m. ET.

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A photo posted by Kunal Nayyar (@kunalkarmanayyar) on Aug 10, 2016 at 10:09am PDT