The gang learns Bernadette is pregnant and celebrate by singing karaoke. Meanwhile, Wolowitz freaks out over the pregnancy announcement and becomes convinced he must make more money to provide for the baby.
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Sheldon stays behind to spend quality time with the pregnant Bernadette when the rest of the gang toddles off to a wine-tasting event where they run into Penny's former boyfriend, and Raj introduces his new girlfriend.
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When Sheldon decides he'd rather go to a movie screening than hang out with Amy, he hires Stuart to spend the day with her. Meanwhile Leonard's mother visits, and Penny just can't seem to connect with her.
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In the Season 10 premiere, the gang deals with the awkward aftermath of an overnight liaison between Sheldon's mother and Leonard's father. Meanwhile, Penny's dysfunctional family is in town for the wedding.
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The guys heads are in a spin when an Air Force bigwig approaches them about their revolutionary gyroscope invention; and Bernadette is upset with Penny after she leaks a secret to the mom-to-be's coworkers about her being pregnant.
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Howard and Leonard are putting in late nights at work and Sheldon is having trouble keeping up; Raj and a pregnant Bernadette spend a day together; and Penny and Amy take in a faculty party.
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