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The gang celebrates Halloween at Stuart's comic book store. Leonard and Penny discover a new spark in their relationship with a scientific seduction.

Sheldon's friendship with renowned scientist Stephen Hawking is threatened by a game of 'Words with Friends.

Bernadette pressures Howard to move out of his mother's house. Sheldon finds himself caught in the middle of a fight between Amy and Wil Wheaton.

Howard and Raj try to understand why Sheldon disappears every afternoon at 2:45. Leonard and Penny wrestle with jealousy in their relationship.

When the University reassigns Sheldon's unused parking spot to Howard, the ensuing turf battle affects the whole gang.

Sheldon plays nursemaid to a sick Amy, while Howard attempts to bond with his father-in-law on an upcoming fishing trip.

Sheldon unwillingly revisits some Christmas memories during a lively game of Dungeons and Dragons, while Raj joins the girls for ladies' night out.

Sheldon is accused of sexual harassment at the University and winds up dragging Leonard, Raj and Howard into the fray.

Tammy and Andrea take the first step toward wedding planning. Amy confronts the elder siblings about what went down on New Year's Eve.

Jaz must face reality after learning that she has gained weight, but she decides to delay a lecture from Dr. Nouri until after her birthday party.

Dara Ó Briain introduces topical chat and hilarious games with two teams of top stand-up comedians as they look back over the week's news.

Frankie finds a full dining set on sale and gives Axl the old dining table. Sue is angry with Darrin after he gives her a not-so-special necklace.

The Hanging. Frankie and Mike are stunned and a bit scared to learn that Brick has invited a girl over to the house. Axl gets locked in the library after hours.

The Heck kitchen sink disappears into the floor. Brick accidentally breaks Mike's lawn mower, and he takes Axl's advice to try and distract their dad.

Do Iguanas Get Pimples Too? Dr. Lee faces off with iguana-wrangler Madison's head growths. Chanel suffers from painful cyst tunnels that leak and smell like the food she eats.

For Larry, a second weight loss surgery would mean another chance at a career as a gospel recording artist. He must change his eating addiction and take control.

What happens when a bride's taste in frocks differs from her entourage? It's style wars! Sparks fly when Rachel falls for a slinky sheath and mum disapproves.

She Said Maybe To The Dress. Radio host Kenzie wants a dress that is as loud and sparkly as her personality. Plus, Jenny Tolman gets married on a beautiful, snowy mountaintop.

Frankie finds a full dining set on sale and gives Axl the old dining table. Sue is angry with Darrin after he gives her a not-so-special necklace.

The Hanging. Frankie and Mike are stunned and a bit scared to learn that Brick has invited a girl over to the house. Axl gets locked in the library after hours.

The Heck kitchen sink disappears into the floor. Brick accidentally breaks Mike's lawn mower, and he takes Axl's advice to try and distract their dad.

Meemaw takes matters into her own hands when Sheldon's philosophy teacher, Professor Ericson, sends him into a tailspin.

Sheldon and his dad dine with President Hagemeyer and a university benefactor. Also, Dale and his ex-wife invite Meemaw to their son's wedding.

Sheldon campaigns to become Dr. Linkletter's lab assistant. Georgie enlists the drama teacher, to help with a surprising business venture.

The gang celebrates Halloween at Stuart's comic book store. Leonard and Penny discover a new spark in their relationship with a scientific seduction.

Sheldon's friendship with renowned scientist Stephen Hawking is threatened by a game of 'Words with Friends.

Bernadette pressures Howard to move out of his mother's house. Sheldon finds himself caught in the middle of a fight between Amy and Wil Wheaton.

Howard and Raj try to understand why Sheldon disappears every afternoon at 2:45. Leonard and Penny wrestle with jealousy in their relationship.

When the University reassigns Sheldon's unused parking spot to Howard, the ensuing turf battle affects the whole gang.

Sheldon plays nursemaid to a sick Amy, while Howard attempts to bond with his father-in-law on an upcoming fishing trip.

Sheldon unwillingly revisits some Christmas memories during a lively game of Dungeons and Dragons, while Raj joins the girls for ladies' night out.

Sheldon is accused of sexual harassment at the University and winds up dragging Leonard, Raj and Howard into the fray.

At Thanksgiving, Sue invites Darrin to the family dinner and gets the feeling that Mike doesn't like him. Brick invites his quirky girlfriend, Cindy.

Mike accompanies Sue on a college tour weekend, and Frankie leaves Brick behind while she goes to see Axl play in his first college football game.

Frankie decides to make this year a minimalist Christmas. Due to Sue's allergy to real Christmas trees, Mike attempts to purchase an artificial one.

Dr. Linkletter pushes Sheldon to make friends with his fellow students, and Georgie gets a pager.

Sheldon, Dr. Linkletter and Meemaw team up on a science experiment. Mary is jealous that Pastor Jeff and Brenda are spending so much time together.

The Geezer Bus And A New Model. Sheldon refuses to ride in a car after getting into an accident with Meemaw. Meemaw is forced to take the church shuttle.

Leonard's car is stolen when the guys take a road trip to a comic book convention in Bakersfield, dressed as Star Trek characters.

Outraged that he's being forced to work with his university nemesis, Barry Kripke, Sheldon faces a crisis of conscience.

When Sheldon and Leonard fight, it affects Penny and Amy's living arrangements. Meanwhile, Raj takes care of Mrs. Wolowitz while Howard is away.

While the guys try to give their significant others the perfect Valentine's Day, Raj and Stuart throw a lonely people party at the comic book store.

After a terrible date, Raj vows to never leave his apartment again. Meanwhile, Penny actually impresses Sheldon with her acting skills.

Leonard, Sheldon and Howard try to advance the cause of women in science by speaking with junior high girls about their future careers.

When Howard finds a letter from his father, he's forced to confront his past. And Leonard and Penny throw a grown-up cocktail party at the apartment.

Let the battle begin! Leonard, Sheldon and Raj fight for tenure at the University - and the competition heats up when the girls get involved.

Summer has macromastia, a condition that causes her breasts to keep growing, so she travels from Scotland to Los Angeles looking for a solution.

Conjoined twins Jose Luis and Jose Armando get advanced medical care. Conjoined twins Pin and Pan navigate their ongoing differences.

First-person accounts combined with raw footage of medical emergencies from the people who survived them and the doctors who treated them.

At Thanksgiving, Sue invites Darrin to the family dinner and gets the feeling that Mike doesn't like him. Brick invites his quirky girlfriend, Cindy.

Mike accompanies Sue on a college tour weekend, and Frankie leaves Brick behind while she goes to see Axl play in his first college football game.

Frankie decides to make this year a minimalist Christmas. Due to Sue's allergy to real Christmas trees, Mike attempts to purchase an artificial one.

Steven's bump is so large, his daughter thinks he is growing a monster on his back. Ethan suffers from an irritating rash in an awkward place on his body.

When her boyfriend and enabler falls ill, Lisa turns to Dr. Now for help with her food addiction. Can she summon the determination to turn her life around.

Charlene is ready to go for the very first dress - can David persuade her picky mum? Morgan is mum's princess. Will she pick the wrong dress to please her.

.. Substantial. Vanisha wants a sexy dress, but her opinionated sisters become an obstacle. Paris is a former bridal consultant who needs an over-the-top ball gown.

At Thanksgiving, Sue invites Darrin to the family dinner and gets the feeling that Mike doesn't like him. Brick invites his quirky girlfriend, Cindy.

Mike accompanies Sue on a college tour weekend, and Frankie leaves Brick behind while she goes to see Axl play in his first college football game.

Frankie decides to make this year a minimalist Christmas. Due to Sue's allergy to real Christmas trees, Mike attempts to purchase an artificial one.

Dr. Linkletter pushes Sheldon to make friends with his fellow students, and Georgie gets a pager.

Sheldon, Dr. Linkletter and Meemaw team up on a science experiment. Mary is jealous that Pastor Jeff and Brenda are spending so much time together.

The Geezer Bus And A New Model. Sheldon refuses to ride in a car after getting into an accident with Meemaw. Meemaw is forced to take the church shuttle.

Leonard's car is stolen when the guys take a road trip to a comic book convention in Bakersfield, dressed as Star Trek characters.

Outraged that he's being forced to work with his university nemesis, Barry Kripke, Sheldon faces a crisis of conscience.

When Sheldon and Leonard fight, it affects Penny and Amy's living arrangements. Meanwhile, Raj takes care of Mrs. Wolowitz while Howard is away.

While the guys try to give their significant others the perfect Valentine's Day, Raj and Stuart throw a lonely people party at the comic book store.

After a terrible date, Raj vows to never leave his apartment again. Meanwhile, Penny actually impresses Sheldon with her acting skills.

Leonard, Sheldon and Howard try to advance the cause of women in science by speaking with junior high girls about their future careers.

When Howard finds a letter from his father, he's forced to confront his past. And Leonard and Penny throw a grown-up cocktail party at the apartment.

Let the battle begin! Leonard, Sheldon and Raj fight for tenure at the University - and the competition heats up when the girls get involved.

Frankie is thrilled when Pam Staggs, the most popular girl in her high school, moves back to Orson and invites her to hang out.

Frankie discovers an old, uncashed pay cheque from Ehlert Motors. Sue takes a part-time job at the quarry as the cleaning lady.

After learning that Aunt Edie has passed away, the Hecks board a train with the body to take her to her final resting place in South Dakota.

When the IRS accuses Sheldon of making a mistake, he stops at nothing to prove them wrong. Meanwhile, Dale is forced to get a colonoscopy.

Sheldon faces consequences after installing a pirated computer game. Mary and Meemaw take Brenda out for Girls Night, and George watches Billy.

Sheldon is at odds with Paige once again when she considers enrolling at East Texas Tech. Mary seeks the advice of June when looking for a change.

After one of his favourite TV shows gets cancelled too soon, Sheldon feels lost, so Amy tries to help him get over his compulsive need for closure.

Leonard and Sheldon hire Professor Proton, the host of their favourite childhood TV show, to perform. Raj leaves his dog with Howard and Bernadette.

When the girls' trip to Vegas falls through, the guys invite them to a Dungeons & Dragons date. Meanwhile, Raj and Lucy go on an awkward date.

When Leonard is offered an exciting new job opportunity overseas, Sheldon grows jealous. Raj pushes Lucy a little too far in their relationship.

Leonard is away at sea, so Sheldon and Penny spend time together and spill some revealing secrets. Howard comes to Raj's aid after a breakup.

Leonard returns from his expedition and finds things chilly between him and Sheldon, and Howard faces questions about his masculinity.

Raj puts together a scientific scavenger hunt that turns into serious, cutthroat competition that brings out the best - and the worst - in the gang.

Amy ruins one of Sheldon's favourite films. Leonard discovers how to get Penny to do his bidding. Raj and Stuart get creative with dating profiles.

Dara Ó Briain digs into the news and unearths some laughs with Rhys James, Angela Barnes, Scott Bennett, Hugh Dennis, Ivo Graham and Sarah Keyworth.

To raise money for the orphanage that raised him, a Mexican cook named Ignacio moonlights as a professional wrestler.