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Sheldon gets in trouble with Amy, and it's up to Penny to teach him how to be a better boyfriend. Howard deals with Bernadette's dislike of children.

Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two on the 100th episode of the series.

Leonard and Penny experiment with dating again by 'beta testing' their relationship. Raj develops a weird bond with his phone's virtual assistant.

Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Howard tries to pick his astronaut nickname.

When Sheldon is forced to take a vacation by the university, he goes to work with Amy in her neurobiology lab.

When a corner office at the university opens, Sheldon must compete for it with his office nemesis, Barry Kripke. Penny gets an unusual gift from Amy.

Jim feels ganged up on when Georgie and Audrey make changes to the tire store, and Mandy helps Georgie navigate a fight between her parents.

Mandy finds out Meemaw runs an illegal sportsbook and wants in on the action. Meanwhile, Georgie struggles to keep Mandy's new job a secret.

Ed Gamble hosts as captains Richard Ayoade, Joanne McNally and teams defend unacceptable views: Rhys James argues to ban retirement before 90.

Ed Gamble, Richard Ayoade and Joanne McNally welcome some brilliant guest comedians to share their wild, unwise or downright unacceptable opinions.

Ed Gamble hosts as captains Richard Ayoade, Joanne McNally and teams defend unacceptable views: Rhys James argues to ban retirement before 90.

Bible Camp And A Chariot Of Love. Sheldon ends up in a fierce competition with Paige after their mums force them to attend Vacation Bible School. Georgie makes a questionable purchase.

Jimmy wants his alligator skin cured so he can find love. Djuka is a stubborn guy with a stubborn bump. Talina has hundreds of tumours on her body.

Brittney has hundreds of tiny bumps over her chest that have destroyed her confidence. John has a nose the size of a plum. Dr. Lee's friend drops in.

Perfectionist Katie has already tried on 50 dresses - will she find her dream dress? Meanwhile, first time dress shopper Aimee wants a vintage look.

A transgender woman, Destinee never felt like she fit in. At 600-lb, she must lose weight if she wants to be approved to transition completely.

Bride Lyndzie believes she was royalty in a past life and wants a regal, form-fitting wedding dress. Plus, Ashley wants a sexy gown that won't shock her mum.

Mike's discovery of a dinosaur bone in the quarry causes the plant to get shut down for scientific research, forcing him to try and get a new job.

Frankie vows to stop yelling at and nagging her kids if they agree to follow-through on their schoolwork and chores without her intervention.

Valentine's Day unexpectedly finds Frankie and Mike home alone for a romantic evening. Unfortunately, the best-laid plans soon begin to unravel.

While Sheldon volunteers at a local train museum, Missy embarks on a new stage of womanhood, and Georgie discovers his mother's guilty pleasure.

Sheldon is determined to ride his bike without training wheels and has Missy teach him. Mary and George argue over parenting styles.

Bible Camp And A Chariot Of Love. Sheldon ends up in a fierce competition with Paige after their mums force them to attend Vacation Bible School. Georgie makes a questionable purchase.

Sheldon becomes jealous and considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.

Leonard must face his fears after being contacted by his high school tormentor, while Penny realises that she might have been a bully herself.

Sheldon gets in trouble with Amy, and it's up to Penny to teach him how to be a better boyfriend. Howard deals with Bernadette's dislike of children.

Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two on the 100th episode of the series.

Leonard and Penny experiment with dating again by 'beta testing' their relationship. Raj develops a weird bond with his phone's virtual assistant.

Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Howard tries to pick his astronaut nickname.

When Sheldon is forced to take a vacation by the university, he goes to work with Amy in her neurobiology lab.

When a corner office at the university opens, Sheldon must compete for it with his office nemesis, Barry Kripke. Penny gets an unusual gift from Amy.

When Mike discovers that Brick won the school spelling bee, he puts all of his efforts into training him and forgets Sue's birthday.

Frankie and Mike are excited to discover that Axl has found the perfect girlfriend and is in love. But when she breaks up with him Axl is heartbroken.

Frankie fears her job at the car dealership may be on the line when hardcore motivational consultant Abby is hired to whip the sales staff into shape.

While Mary and George take a trip, Georgie freaks out when his girlfriend thinks she's pregnant. Dale and Meemaw work out their relationship issues.

While college orientation does not go as Sheldon planned, Mary is mistaken for a university student and invited to a party.

Sheldon's first day of college is derailed by his new philosophy teacher. Mary and Brenda live vicariously through Missy's first day of middle school.

A change in Sheldon's routine forces him to re-evaluate his entire life, when his barber is sick. Howard rethinks his decision to go into space.

Sheldon chooses to participate in a guys-only weekend Star Wars gaming marathon rather than go with Amy to her aunt's birthday party.

It's a dream come true for Sheldon when he has a close encounter with his hero, Mr. Spock -legendary sci-fi icon Leonard Nimoy.

When Wolowitz gets to work with world-renowned scientist, Stephen Hawking, Sheldon is willing to do anything to meet his hero.

Howard's wedding plans are in jeopardy after the guys throw him a bachelor party, and details of his sexual history are leaked online.

When NASA reschedules Howard's mission and puts his wedding plans in jeopardy, he's forced to face his fears - and Bernadette's dad.

When Howard and Bernadette decide they want to be married before his NASA space launch, the gang rushes to put on a wedding.

Howard discovers that he can't escape his mother - even in space! Back on earth, meanwhile, Raj turns his existence as a third wheel into an art form.

Ed Gamble hosts as captains Richard Ayoade, Joanne McNally and teams defend unacceptable views: Rhys James argues to ban retirement before 90.

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

When Mike discovers that Brick won the school spelling bee, he puts all of his efforts into training him and forgets Sue's birthday.

Frankie and Mike are excited to discover that Axl has found the perfect girlfriend and is in love. But when she breaks up with him Axl is heartbroken.

Frankie fears her job at the car dealership may be on the line when hardcore motivational consultant Abby is hired to whip the sales staff into shape.

Mike's religious beliefs have kept him from seeing a doctor about his huge growth. Plus, Kylie debates whether to remove her birthmark.

Jeanne runs into several obstacles in her weight-loss journey, including unhygienic conditions. And an unexpected death sets her back.

Laura wants a totally different dress to the ball gown her sister wore on her wedding day. Joanna craves a sexy gown, but 10-year-old daughter Mia has other ideas.

When Mike discovers that Brick won the school spelling bee, he puts all of his efforts into training him and forgets Sue's birthday.

Frankie and Mike are excited to discover that Axl has found the perfect girlfriend and is in love. But when she breaks up with him Axl is heartbroken.

Frankie fears her job at the car dealership may be on the line when hardcore motivational consultant Abby is hired to whip the sales staff into shape.

While Mary and George take a trip, Georgie freaks out when his girlfriend thinks she's pregnant. Dale and Meemaw work out their relationship issues.

While college orientation does not go as Sheldon planned, Mary is mistaken for a university student and invited to a party.

Sheldon's first day of college is derailed by his new philosophy teacher. Mary and Brenda live vicariously through Missy's first day of middle school.

A change in Sheldon's routine forces him to re-evaluate his entire life, when his barber is sick. Howard rethinks his decision to go into space.

Sheldon chooses to participate in a guys-only weekend Star Wars gaming marathon rather than go with Amy to her aunt's birthday party.

It's a dream come true for Sheldon when he has a close encounter with his hero, Mr. Spock -legendary sci-fi icon Leonard Nimoy.

When Wolowitz gets to work with world-renowned scientist, Stephen Hawking, Sheldon is willing to do anything to meet his hero.

Howard's wedding plans are in jeopardy after the guys throw him a bachelor party, and details of his sexual history are leaked online.

When NASA reschedules Howard's mission and puts his wedding plans in jeopardy, he's forced to face his fears - and Bernadette's dad.

When Howard and Bernadette decide they want to be married before his NASA space launch, the gang rushes to put on a wedding.

Howard discovers that he can't escape his mother - even in space! Back on earth, meanwhile, Raj turns his existence as a third wheel into an art form.

Mr. Ehlert takes a liking to Mike and gives him basketball tickets. But when Frankie's uncle passes away, the funeral is set for the day of the game.

After having the power turned off because they couldn't afford to pay the bill, Frankie and Mike decide to cut expenses, starting with cable TV.

Frankie is worried that Axl's going to get his heart crushed again when his on-again/off-again girlfriend re-enters his life.

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.

After learning Penny is thinking about breaking up with Leonard, Sheldon tries to intervene. Howard is being picked on in space by the astronauts.

While the pressure of being in space starts to take its toll on Howard, Amy feels threatened when Sheldon hires a young female assistant, Alex.

When Howard returns from space, he doesn't get the hero's welcome he expected. Meanwhile, Game Night turns into a battle of the sexes.

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.

Kayleigh's acne has blighted her life and Howell's had enough of the lump on his scalp. Dave just can't stop scratching and Christine's cyst has got to go.

It's Heartbreaking. With a history of leukaemia, Libby's mum is worried about her mystery rash. Baby Emerick's severe eczema makes him scratch until he bleeds.