The Big Bang Theory is introducing members of Penny's family!
Katey Sagal will reunite with former co-star Kaley Cuoco on television's biggest comedy, playing Penny's mother, "Susan," executive producer Steve Molaro announced during Friday's Comic-Con panel.
30 Rock's Jack McBrayer has also been cast as Penny's drug-dealing brother, "Randall," it was revealed at the panel.
Sagal and McBrayer will make their Big Bang debuts in the season 10 premiere.
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