• "The Big Bang Theory" Season 10 will premiere on Sept. 10.

"The Big Bang Theory" Season 10 will premiere on Sept. 10. (Photo : Getty Images/Matt Winkelmeyer)

The cast and crew of "The Big Bang Theory" are currently filming Season 10. Although this might be the show's last run ever, the squad is still all smiles as they share group selfies on the set.

"The Big Bang Theory" Season 10 cast shared photos on the set through their Instagram accounts. They were, however, very careful not to spill spoilers or details that could lead to potential Season 10 spoilers. The only thing actress Kaley Cuoco revealed is that she will be sporting shorter locks in "The Big Bang Theory" Season 10.

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Speaking of Cuoco, there's a lot in store for her character, Penny, in "The Big Bang Theory" Season 10, as her mysterious family will finally get that grand introduction. After the wedding ceremonies, Penny will get a visit from her mother and brother, two characters that have been a complete mystery to the fans.

In an interview with Entertainment Weekly, "The Big Bang Theory" executive producer Steve Molaro said that family tension will abound in Season 10.

"As we know, her brother Randall has been a bit of trouble over the years, selling drugs and being in and out of jail, and that's put a lot of stress on her mom," Molaro said. "You will pick up on the tensions between her mother and her brother very quickly, and you get a glimpse of Penny and her dad being caught in the middle of that."

Given how complicated things are in Penny's family, it will certainly add for a lot of drama, especially with her marriage with Leonard.

So far, episodes 2 and 3 of Season 10 have received official titles. According to Wikia, in episode 2, the Air Force expresses their intention to buy the guys' invention.  There's still no word as to what's in store for "The Big Bang Theory" Season 10 episode 1, but it's been previously reported that the tenth season will pick up with the events that followed Penny and Leonard's wedding.

With that said, viewers will learn about what happened to Leonard's dad and Sheldon's mother. This has been keeping fans on their toes, especially since there are rumors that should love blossom for the two, Leonard and Sheldon might end up becoming step brothers in "The Big Bang Theory" Season 10.

"The Big Bang Theory" Season 10 will premiere on Sept. 10.