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

George Sr. makes a deal with Sheldon to tutor his brother when Georgie's poor grades threaten his place on the football team.

Sheldon interviews with a school for gifted children. Much to their surprise, the rest of the family struggle with his absence.

A worried Mary sends Sheldon to Sunday school after she finds him playing Dungeons & Dragons with Tam and Billy.

Penny's business selling hair accessories out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge.

Penny feels threatened when another sexy woman moves into the apartment building and angered when she senses the guys are being taken advantage of.

A fellow comic book enthusiast's hitting on Penny leads to Leonard, Raj and Howard going to a bar's Ladies' Night.

Leonard and Raj take Wolowitz to Las Vegas to help him get over his break-up. Sheldon locks himself out and has only one other place to stay: Penny's.

Stuart asks Leonard's advice for a date with Penny. Wolowitz realises there's an error in a toilet he designed for the International Space Station.

The guys receive a prestigious offer to work over the summer at the North Pole, and Penny's resultant behaviour leaves Leonard unsure if he should go.

Discovering Leonard, Raj and Howard fudged the results of his Arctic research expedition, a disgraced Sheldon heads home to Texas.

Sheldon and Howard wager comic books over a cricket's species. Meanwhile, a less-than-perfect romantic night agonizes Leonard and Penny.

Georgie worries that he's leaving Connor out of his new project with Jim. Meanwhile, Mandy and Audrey struggle to decorate CeeCee's nursery.

Tensions rise when Georgie intrudes on Mandy's new sales gig. Meanwhile, Audrey's conflicted when Jim makes it a point not to coddle Connor.

Sheldon asking for a computer has unforeseen consequences for his parents, prompting Mary and the twins to move in with Meemaw.

Sheldon's germophobia lands him in detention when flu season hits Medford and he takes extreme measures to remain healthy.

When Mary takes a job at the church, Sheldon and Missy are left home alone for the very first time.

Sheldon makes a new friend who introduces him to a new field of science, while his parents disagree on how to handle Sheldon's blossoming social life.

Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behaviour modification experiment on Penny.

Facing a return to India, Raj needs a job desperately enough to consider working for Sheldon. Howard becomes a third wheel to Leonard and Penny.

Sheldon looks forward to squaring off against a Star Trek actor in a fantasy card game tournament. Wolowitz cashes in on an old pact with Leonard.

Hoping to fit in with Penny's football-loving friends, Leonard gets tutored in the sport by Sheldon. Raj is furious over the loss of his patang.

Leonard and Penny's first big fight sees Sheldon playing mediator due to childhood trauma that means he can't be around loud verbal conflicts.

Barry Kripke pranks Sheldon during his spot on NPR, leaving him wanting vengeance. Bernadette pressures Wolowitz to define their relationship.

Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment.

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon.

A business exec fights loneliness and many physical challenges when a plane crash leaves him stranded alone on an island for four years.

When his car breaks down, Mike is forced to decide whether or not to accept a loan from Carl to fix it.

C. Small? Mike and Carl arrest Molly's literary hero for driving under the influence. Later, after Molly repeatedly helps the author, she is offered a job.

Amber has hundreds of tumours on her face. Cheri and Janice suffer from possibly matching lumps. Tatiana has an embarrassing bump on her butt cheek.

With her weight spiralling, Stephanie needs her mum's help to care for her three kids. Now, she must lose weight if she's to see her kids grow up.

A son and daughter are brutally honest when they help their mum find a wedding dress. Plus, Al and Jo try to fix a family rift between bride Emma and her mum.

Despite losing eight stone, Amy still has seriously low self-esteem. Plus, blogger Laura has amazing confidence but very high expectations for her dream dress.

Georgie worries that he's leaving Connor out of his new project with Jim. Meanwhile, Mandy and Audrey struggle to decorate CeeCee's nursery.

Tensions rise when Georgie intrudes on Mandy's new sales gig. Meanwhile, Audrey's conflicted when Jim makes it a point not to coddle Connor.

Sheldon asking for a computer has unforeseen consequences for his parents, prompting Mary and the twins to move in with Meemaw.

Sheldon's germophobia lands him in detention when flu season hits Medford and he takes extreme measures to remain healthy.

When Mary takes a job at the church, Sheldon and Missy are left home alone for the very first time.

Sheldon makes a new friend who introduces him to a new field of science, while his parents disagree on how to handle Sheldon's blossoming social life.

Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behaviour modification experiment on Penny.

Facing a return to India, Raj needs a job desperately enough to consider working for Sheldon. Howard becomes a third wheel to Leonard and Penny.

Sheldon looks forward to squaring off against a Star Trek actor in a fantasy card game tournament. Wolowitz cashes in on an old pact with Leonard.

Hoping to fit in with Penny's football-loving friends, Leonard gets tutored in the sport by Sheldon. Raj is furious over the loss of his patang.

Leonard and Penny's first big fight sees Sheldon playing mediator due to childhood trauma that means he can't be around loud verbal conflicts.

Barry Kripke pranks Sheldon during his spot on NPR, leaving him wanting vengeance. Bernadette pressures Wolowitz to define their relationship.

Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment.

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon.

Georgie discovers that Jim's annual tire convention trip isn't what he says it is. Meanwhile, Mandy has doubts about the strength of her marriage.

Audrey and Mary go to war over CeeCee and Georgie, and Mandy can't help but take sides.

A disappointing loss at the science fair sparks an existential crisis and sends Sheldon's life in a new direction.

When Sheldon is bullied by an unlikely character, Mary and George disagree on how to handle the situation.

When Mary bans Sheldon from reading a mature comic book, Sheldon decides it's time to assert his independence from his mother.

When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by a professor.

Leonard is aghast to find out that Penny believes in psychics. Sheldon tries to assist Koothrappali in picking up a girl at a university party.

A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.

Stuck on the solution to a physics problem, Sheldon tries different methods to change his thinking, including working at The Cheesecake Factory.

When Leonard is offered a trip to Switzerland on Valentine's Day to see a particle accelerator, he must choose between taking Penny or Sheldon.

An appearance in traffic court comes at the worst possible time for Sheldon, the same day Stan Lee is appearing at the comic book store.

The guys go to a garage sale and find a ring from the Lord of the Rings films, and the rare find threatens their friendship.

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him prepare for the big night.

Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.

Marissa worries how her resort employee fiancé will adapt to life in America. Ashia and Maxwell get a shocking decision about his visa.

Liz and Villa delve into their lingering emotions, Kim grills Gino, and Diana makes a discovery that has her reconsidering her relationship with Colt.