When Bernadette won't go in labor, all her friends try different tactics to get things started. Howard confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.
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Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy. Bernadette and Howard have a hard time deciding who should stay home with the kids and who should go back to work.
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Penny gets the opportunity to host Bill Gates at work when his company wants to partner with her pharmaceutical firm. Leonard, Raj, and Howard do everything they can to meet him, and Sheldon thinks he is the victim of an April Fools prank.
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When Leonard learns Sheldon is the president of the tenants association, he decides to run against him. Bernadette encourages Howard and Raj to find the owner of a drone after they find it in the backyard.
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Reclusive scientist, Doctor Wolcott, invites Sheldon to his cabin in the middle of nowhere, and Leonard, Raj and Howard go along. Penny and Bernadette improvise after Amy doesn't like the tame bachelorette party they planned for her.
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Sheldon's comic book store experience changes when writer Neil Gaiman puts Stuart's store on the map. Raj takes credit for Penny's astronomical discovery, and friendships are threatened.
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Sheldon goes to Vegas to win money for science. Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.
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Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend, so Leonard takes matters into his own hands. Bernadette and Penny take out Raj's fiance, Anu, for dinner to get the skinny on her.
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Leonard is caught between a rock and a hard place when he's responsible for distributing extra grant money. Bernadette turns the backyard playhouse into a hideaway from her husband and kids.
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Sheldon tries to bond with Amy's father, but when Howard lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Raj and Anu try to get physical for the first time.
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Sheldon and Amy are devastated learning from a Russian paper that Super Asymmetry has been discovered and disproven. Ultra-competitive Bernadette asks Stuart's girlfriend, Denise, to teach her how to beat Howard in a popular videogame.
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Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon's past inspires him not to give up. Bernadette turns into a pageant mom when she tries to help Howard ace his Magic Castle audition.
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Penny and Leonard organize a paintball game that results in mayhem when Sheldon is jealous of Amy. Raj catches Anu with her ex-boyfriend, and Stuart doesn't want to move in with Denise.
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Penny's ex-boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard to help. Raj attempts to mend things with his ex-fiancee, Anu.
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Amy has a meltdown due to the pressure associated with winning a Nobel Prize. Raj and Howard try to relive the good old days after Howard buys a scooter that looks like the one he had years ago.
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About
Leonard and Sheldon are brilliant physicists, the kind of ''beautiful minds'' that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door.
