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When George Sr. is rushed to the emergency room, Meemaw comes to babysit. And the kids have an adventure getting to the hospital on their own.

Sheldon refuses to eat solid food after a choking scare but finds solace in a new interest after he discovers comic books.

A Solar Calculator, A Game Ball. Sheldon uses his statistics skills to help his father coach the football team. Both Sheldon and Georgie struggle with the popularity this brings.

When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard.

Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent. However, Sheldon's lie becomes a bit too complicated.

With his friends knowing how sour he acts when sick and avoiding him as a result, Sheldon is nursed by Penny, who hasn't a clue what she's in for.

With Sheldon rattled after meeting Dennis, a teen physicist who's smarter than he is, the rest of the guys search for a way to eliminate the threat.

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team hoping to prove he's superior.

When the delivery of a full-size prop of 1960's 'The Time Machine' causes Penny to miss work, she scolds Leonard about his sci-fi collectibles.

The gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll decide who can date her.

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

Penny's breakup spurs Leonard to summon the courage to ask her out, and they both go to Sheldon for advice on their upcoming date.

Teacher Molly hears cop Mike's share at an Overeaters Anonymous meeting. Instantly smitten, she invites him to come speak to her fourth-grade class.

When Molly gets a cold before her first date with Mike, she takes some cold medication to help her feel better - with disastrous results.

Mike's ego is put on the line during a bowling date with Molly.

A Patch, A Modem And A Zantac. After being dismissed in class, Sheldon is determined to prove a visiting NASA representative wrong and starts studying theoretical physics.

A Brisket, Voodoo And Cannonball Run. Meemaw refuses to give George Sr. her brisket recipe. The kids try to think of ways to resolve this family feud.

George takes his sons to see a space shuttle launch. Meanwhile, Mary, Meemaw and Missy have a girl's night at the salon.

Penny opens up to Sheldon after a less-than-stellar first date with Leonard, placing him in the uncomfortable position of having to keep a secret.

Seeing Penny with another guy sends Leonard back to Leslie Winkle, much to Sheldon's dismay.

Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistently pesters Sheldon for advice.

Full of confidence following being named one of People's 30 to Watch Under 30, Raj hits on Penny and becomes impossibly arrogant.

An intervention is used to try to force Sheldon to overcome his fear of driving.

Sheldon and his friends are mystified when a younger undergraduate student is attracted to him.

When Sheldon bans Penny from the apartment, she decides to retaliate. Howard and Raj search for the America's Next Top Model house.

Sheldon wants to use an alternate version of rock-paper-scissors to help resolve conflicts. A girl Wolowitz has a major crush on falls for Leonard.

Humanity's fate rests in the unlikely hands of a teenager when two races of warring extra-terrestrial robots make Earth their final battleground.