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'Big Bang Theory': Tensions rise when Sheldon and Leonard's moms meet

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Michael Yarish/CBS

The arrival of Sheldon (Jim Parsons) and Leonard’s (Johnny Galecki) mothers will shine a light on their very unconventional friendship during Thursday’s episode of The Big Bang Theory.

“This is the first time their moms meet in the flesh,” executive producer Steve Molaro tells EW. “They are very different women. It is as explosive as you might think it would be.”

However, Leonard’s cold but brilliant mother (Christine Baranski) and Sheldon’s sweet but simple mom (Laurie Metcalf) will find some common ground. “You’ve got a dynamic where Sheldon’s mom loves her Shelly and Leonard’s mom is also quite fond of Sheldon, so you’ve got two moms spending a lot of time doting on Sheldon and really no one paying that much attention to Leonard, so that’s where the friction between the boys starts,” Molaro says.

Check out a sneak peek from Thursday’s episode:

The Big Bang Theory airs Thursdays at 8 p.m. ET on CBS.