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After spending the weekend with Molly, Mike comes on too strong. Then, taking Carl's advice to play it cool, he tries not to go overboard.

Annoyed when she spends all her time at Mike's apartment, Molly insists he spend a night at her place - and a taste of life with her mum and sister.

Molly becomes jealous when Mike introduces her as his friend to a woman who is clearly flirting with him.

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.

The gang is thrilled to see Summer Glau is also aboard their train to San Francisco. Sheldon frets over having forgotten a paper he wants to present.

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.

When Mike's overbearing mother buys Molly a new hat as a gesture of goodwill, Molly feels obliged to invite her to spend Thanksgiving with her family.

When Carl borrows Mike's apartment for a date, Mike spends more time at Molly's house and ends up bonding with her mum and sister.

Mike tries to find the perfect gift for Molly, but he has absolutely no idea what to buy for their first Christmas together.

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.

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.

With the rest of the gang off on a desert camping trip, Sheldon must play hero after Penny slips in the tub and dislocates her shoulder.

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

Tragedy and criminal activity are as much a part of the Real Housewives franchise as designer handbags and multimillion-dollar mansions.

Sex therapist Amie Hardwick had the beauty and brains to charm Hollywood. But, when one star rises, another's deadly obsession is never far behind.