Katey Sagal, Jack McBrayer to guest star Posted July 23, 2016

Katey Sagal, Jack McBrayer to guest star

Katey Sagal and Jack McBrayer will be guest starring in the tenth season premiere of The Big Bang Theory, the show's writers revealed Friday during their Comic-Con panel. The pair will be playing Penny's mother and brother who are in town to attend her do-over wedding ceremony with Leonard.

Katey Sagal, known for her roles on Married with Children and Sons of Anarchy, previously played Kaley Cuoco's on-screen mother in the 2002-2005 sitcom 8 Simple Rules, which also starred John Ritter until his untimely death in 2003. On The Big Bang Theory, Katey Sagal will be playing Susan, Penny's overstressed and neurotic mother whose main source of frustration is her son.

Jack McBrayer, best known for his role as the super friendly and optimistic Kenneth Purcell on the NBC sitcom 30 Rock, will be playing the role of Randall, Penny's previously mentioned brother who has spent time in and out of prison on drug charges.

Keith Carradine will be reprising his role as Penny's father, Wyatt, who we first met in the fourth season of the show and more recently appeared in a ninth season episode.

The Big Bang Theory's tenth season will premiere Monday, September 19 on CBS.

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