• "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)

Keith Carradine, Katey Sagal and Jack McBrayer are reprising their respective roles as Penny (Kaley Cuoco)'s father Wyatt, mother Susan and brother Randall in "The Big Bang Theory" Season 10. Set to premiere on Sept. 19, the new season of the CBS sitcom will deal with the family.

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"Penny's close with her dad," Entertainment Weekly quoted executive producer Steve Molaro as saying. "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."

According to Molaro, "The Big Bang Theory" Season 10 will pick up on the tensions between Susan and Randall very quickly. Viewers will get a glimpse of Penny and Wyatt being caught in the middle of this.

Along with Cuoco, main casts Johnny Galecki, Jim Parsons, Simon Helberg, Kunal Nayyar, Mayim Bialik and Melissa Rauch are returning to "The Big Bang Theory" Season 10. They are reprising their respective roles as Leonard Hofstadter, Sheldon Cooper, Howard Wolowitz, Raj Koothrappali, Amy Farrah Fowler and Bernadette Rostenkowski.

Currently, Cuoco, Galecki and Parsons' have three-year contracts estimated at $1 million per episode. The contracts will expire in May 2017.

Recently, CBS Entertainment chief Glenn Geller attended the Television Critics Association press tour. He talked about the main cast members of the sitcom who all want to come back for more seasons.

"We're very confident that everyone involved wants more 'Big Bang Theory' past year 10," USA Today quoted Geller as saying. He also said it is likely for Warner Bros. to make the cast deals.

Three other characters are also expected to be featured in "The Big Bang Theory" Season 10 episode 10 aside from Penny, Wyatt, Susan, Randall, Leonard, Sheldon, Howard, Raj, Amy and Bernadette. They are Dr. Beverly Hofstadter (Christine Baranski), Dr. Alfred Hofstadter (Judd Hirsch) and Mary Cooper (Laurie Metcalf).

Watch Cuoco talk about "The Big Bang Theory" Season 9 finale here: