Big Bang Theory plot hole: Who was Penny's sister?

Characters in The Big Bang Theory have some great back stories, including aspiring actor Penny (played by Kaley Cuoco). In the series Penny is the girl next door to Sheldon Cooper (Jim Parsons) and Leonard Hofstadter (Johnny Galecki). Later on in the series Penny and Leonard marry after realising their true feelings for one another.

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However fans have pointed out a number of plot holes surrounding Penny’s character.

She is renowned for name-dropping her family members, one being her sister, Lisa.

Viewers have picked up on the fact they never meet Lisa in the show, but she is talked about a lot throughout. said: “Here’s what we do know about Lisa: Her water broke at her own , she shot her husband when they were both drunk and she gave Penny a bikini wax using crayons when they were younger.

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Where is Penny's sister in The Big Bang Theory?Who is Penny's sister in The Big Bang Theory? (Image: Channel 4)

Big Bang Theory: Who was Penny's sister?Big Bang Theory: Why was Penny's sister not featured? (Image: Channel 4)

How much is Kaley Cuoco worth?Who is Kaley Cuoco? (Image: Getty Images)

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“However, not only does Lisa not attend her own sister’s but no one in the family even mentions her - which begs the question, where and what happened to Lisa?”

Penny’s family has always been a mystery and she is the only character in the show

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