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Georgie and Mandy get fed up staying with her parents and reconsider their living situation after a fight with Mandy's mum, Audrey.

Georgie struggles to balance life, work and family. Mandy worries for Georgie's wellbeing and Missy gets into trouble at school.

Runaway Bump, Never Coming Back? Leonard has a bump hanging off his arm that looks like it's breaking through skin. Jess has a visible lump on her butt after falling downstairs.

Dr. Sandra Lee treats Heather, who has a huge growth on her leg and fears removing it could leave a keloid scar. And, Paul has a giant hump on his back.

Paul weighs in at 700-lbs and his girlfriend struggles with how his weight limits their life together. He worries the relationship won't survive his time in Houston.

Bride Mel is hoping to find a wedding dress that will show off her body. Meanwhile, can Gok keep the peace between Hayley and her opinionated mum.

Having been a bridesmaid seven times, Candice is finally getting wed but struggles with how she looks. Gok helps rebuild her confidence.

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.

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.

A heated argument erupts between the Coopers and their neighbours when a new dog terrorises Sheldon.

Georgie and Mandy get fed up staying with her parents and reconsider their living situation after a fight with Mandy's mum, Audrey.

Georgie struggles to balance life, work and family. Mandy worries for Georgie's wellbeing and Missy gets into trouble at school.

When Samuel loses his job and apartment, Mike offers to let him stay at his place - with interesting results.

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

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.

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.

Following Leonard and Penny's break up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting the story of how he met and moved in with Sheldon.

The Autobots race against the Decepticons to reach the Cybertronian spacecraft, which could turn the tide in their final battle.