'Big Bang Theory' first look: Katey Sagal and Jack McBrayer make their debut

Kate Stanhope


Big Bang Theory viewers are about to see a whole new side of Penny (Kaley Cuoco).

The upcoming season 10 premiere of the CBS sitcom is set to introduce Penny's mom (Katey Sagal) and her brother (Jack McBrayer), and The Hollywood Reporter has a first look at their highly anticipated series debut below.

Read more: 'Big Bang Theory' Boss on Season 10 Wedding(s) and Future Amid Contract Uncertainty

In the premiere, titled "The Conjugal Conjecture," Penny's anxiety-ridden mother, Susan, (Sagal) and drug-dealing brother, Randall, (McBrayer) arrive for the wedding ceremony. As seen in the photo, Penny's father Wyatt (Keith Carradine) also comes to town, making for a seemingly awkward family reunion.

“The Conjugal Conjecture” – Pictured: Penny (Kaley Cuoco), Wyatt (Keith Carradine), Randall (Jack McBrayer) and Susan (Katey Sagal). After Sheldon’s mother and Leonard's father share an evening together, everyone deals with an awkward morning the next day. Also, Penny’s family arrives for the wedding ceremony, including her anxiety-ridden mother, Susan (Katey Sagal), and her drug dealing brother, Randall (Jack McBrayer), on the 10th season premiere of THE BIG BANG THEORY, Monday, Sept. 19 (8:00-8:30 PM, ET/PT), on the CBS Television Network. Dean Norris guest stars as Colonel Williams, an Air Force Representative from the Department of Materiel Command. Christine Baranski, Laurie Metcalf, Judd Hirsch and Keith Carradine return. Photo: Monty Brinton/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.

CBS

The episode also features appearances by Dean Norris, as well as returning guests Christine Baranski, Laurie Metcalf and Judd Hirsch.

See more photos of Kaley Cuoco through the years:

Sagal and McBrayer's castings were announced at Comic-Con. For Sagal, the gig marks a reunion with Cuoco, who played Sagal's daughter on the ABC sitcom 8 Simple Rules. Sagal most recently starred on FX's Bastard Executioner and is next to appear on NBC's freshman drama This Is Us. McBrayer, best known for his role on 30 Rock, has more recently appeared on The Middle and New Girl.

The Big Bang Theory season premiere airs Monday, Sept. 19 at 8 p.m. on CBS.

Kaley Cuoco flashed her bare breast in a recent Snapchat picture. Look:


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