Big Bang Theory is actually revealing Penny's mum this season 

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legend Katey Sagal - who previously played Kaley Cuoco\'s mother on

writers\' panel at Comic-Con International on Friday (July 22) - along with the news that

\'s Jack McBrayer will also pop in as Penny\'s drug-dealing brother.

has deliberately shied away from introducing members of Penny\'s family for nine seasons - aside from Keith Carradine\'s memorable cameo as her dad.

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When Penny catches up with her mum Susan in the tenth season opener, she\'ll find a stressed-out Susan at the end of her rope with son Randall (McBrayer).

Randall\'s seemingly friendly demeanour actually belies a shady past as a drug-dealing ex-con always in trouble with the law.

The debut of Penny\'s extended family is also massively important because we just met Leonard\'s dad (Judd Hirsch) in the spring finale.

star Kaley Cuoco\'s mum in three seasons of mid-2000s ABC sitcom

proves to be the mammoth comedy\'s last remains to be seen.

"It could be the end. Hopefully it\'s not. The decisions are not up to us," star Kunal Nayyar recently admitted. "I hope it isn\'t. Unanimously, none of us want it to end."

kicks off its fall season on Monday, September 19 on CBS in the US. E4 and Channel 4 air the series in the UK.

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