Gregg DeGuire/WireImage; Michael Yarish/Warner Bros.
July 18, 2017 at 07:20 PM EDT

Annie Potts has joined the cast of The Big Bang Theory spin-off Young Sheldon as a younger version of Sheldon’s famed grandmother Meemaw, EW has confirmed. The Hollywood Reporter first broke the news.

On the flagship series, the character was often mentioned over the years as a sort of Kryptonite for Sheldon (Jim Parsons), who believed his Meemaw to be perfect. She was finally portrayed by June Squibb in season 9. But viewers of the spin-off will discover she is anything but perfect as Potts’ character is described as Sheldon’s “foul-mouthed, hard-drinking Texas grandmother who is very supportive of her grandson and his unique gifts.”

The half-hour, single-camera comedy will follow a 9-year-old Sheldon Cooper (Big Little Lies‘ Iain Armitage) living with his family in East Texas and going to high school. Zoe Perry is attached to play Sheldon’s mother — Meemaw is her mom — who is portrayed on the flagship by Perry’s real-life mom Laurie Metcalf. Lance Barber, Raegan Revord, and Montana Jordan will also star.

Parsons — who is set to executive-produce the comedy alongside creators Chuck Lorre and Steven Molaro, as well as Todd Spiewak — will also narrate the comedy as Adult Sheldon. Jon Favreau will direct and executive-produce the series premiere.

Young Sheldon will have a special debut on Monday, Sept. 25 at 8:30 p.m. ET before moving to Thursdays on Nov. 2 on CBS.

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