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Leonard volunteers to sign for a package to make a good impression on Penny, but things go terribly awry when he enlists Sheldon for help.

Leonard is depressed to learn that Penny is dating someone. Encouraged by his friends and fellow scientists, he asks a colleague out on a date.

Sheldon gets fired and explores what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

Fearing he's wasting his time on Penny, Leonard makes a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine.

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills.

When a group of mercenaries steal a hi-tech weapon that poses a global threat, Xander Cage leads a team of adrenaline junkies on a recovery mission.

Firefighter and passionate cyclist Dave is concerned about a pilar cyst on his head that prevents him from wearing helmets.

Dr. Lee meets Dee, a singer with a huge neck hump. Eli is embarrassed of his cheek bump but is worried that the removal could paralyse his face.

Aimee has a mohawk of cysts on her head. Plus, Edith's face markings and itchy skin condition turn out to be more than she expected.

Aaron lives at home to care for his elderly dad. But his food addiction could send him to an early grave unless he gets weight-loss surgery.

Victoria loves sparkle but doesn't want to be covered in glitter. Can David find something glitzy? Bride Zahra craves big bling, but she'll need a bigger budget.

Melissa's having a big fat Greek wedding but doesn't want a typical dress! Naomi seeks a subtly sexy frock but worries what her conservative family will think.

Carnival queen Lera seeks a dress to suit her big personality! Sinead found a gown on her first shopping trip - will she regret her hasty buy at her fitting.

After gaining relationship weight, will Charlie settle for comfort over couture? Geraldine struggles to maintain her weight and is doubtful of her choice of gown.

Molly meets the best buddy of her dreams when Peggy's childhood friend, Kay McKinnon comes to town, but Peggy is not keen on sharing.

Molly looks to win some extra cash when she and the girls head to a riverboat casino for the weekend. Mike and Vince try to enjoy college football.

Mike and Samuel take a road trip to Memphis to meet Carl's mother for the first time after Carl finds out she has been ill.

When Meemaw's gambling room is a success, she ends up with a suitcase of illegal cash. Missy starts a business, and Sheldon tries the stock market.

Sheldon gets an odd request from an old friend, while George and Mary are caught in the middle of Meemaw and Dale's breakup.

While Sheldon copes with the death of a hero, Georgie struggles with his big secret, and Missy wants to babysit.

Everything changes as Amy and Sheldon await big news. Howard and Bernadette leave their kids, while Leonard and Penny keep a secret.

Bernadette and Howard leave their kids, Penny and Leonard try to keep a secret, Sheldon and Amy stick together, and Raj makes a new friend.

Brilliant physicists Leonard and Sheldon meet new neighbour Penny, who shows them that although they're smart, they know very little about real life.

Leonard volunteers to sign for a package to make a good impression on Penny, but things go terribly awry when he enlists Sheldon for help.

Leonard is depressed to learn that Penny is dating someone. Encouraged by his friends and fellow scientists, he asks a colleague out on a date.

Sheldon gets fired and explores what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

Fearing he's wasting his time on Penny, Leonard makes a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine.

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills.

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

Late at night, Molly catches Carl coming out of Victoria's room, leaving her questioning whether or not she will tell Mike.

Mike wants Peggy to see a doctor after her bathtub falls through the ceiling.

George and Mary insist on meeting the new woman in Georgie's life, while Sheldon and Missy have suspicions about what's going on with their family.

Despite the whole family trying to keep it a secret, Sheldon and Missy learn about Georgie's pregnancy.

With the Coopers facing judgement from the congregation in the wake of Georgie's pregnancy, Sheldon is distracted by the family drama.

When Wolowitz goes AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team.

Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon.

When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard.

Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent. However, Sheldon's lie becomes a bit too complicated.

With his friends knowing how sour he acts when sick and avoiding him as a result, Sheldon is nursed by Penny, who hasn't a clue what she's in for.

With Sheldon rattled after meeting Dennis, a teen physicist who's smarter than he is, the rest of the guys search for a way to eliminate the threat.

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team hoping to prove he's superior.

When the delivery of a full-size prop of 1960's 'The Time Machine' causes Penny to miss work, she scolds Leonard about his sci-fi collectibles.

Elise grows suspicious of Joshua's relationship with a female friend, and Forrest and Sheena receive troubling news about the K-1 visa.

Debbie arrives to fix things between Cortney and Colt. Vanja's trip to Maine turns toxic. Kim is ready to find the daughter she placed for adoption.

Elizabeth's head is covered with giant cauliflower-shaped bumps. Jamaal has been growing a strange knob on his bottom since he was just a boy.

Holy Cyst?! Kenny's rare condition causes hundreds of lumps to grow all over his body. Plus, Paula's painful and swollen feet ooze a foul-smelling substance.

Kelly inherited her love of food from her obese mum. After a personal tragedy her weight ballooned to over 700-lb and she is nearly immobile.

Deborah is after an off-the-shoulder, glamorous gown but her entourage has conflicting opinions! Plus, will Dahlia go with her mum's preference of a princess dress.

Stubborn Sophie knows just what she wants - and refuses to come out in the first dress! Plus, bride Emma clashes with her friend over her dress choice.

Bride Hattie has no idea what she's after and David's at a loss! Will they let mum choose? Lisa knows what she wants but her entourage has other ideas.

Glam gran Angela is three times lucky in love and won't compromise on her dream dress: can her entourage change that? Bride Emily wants to shine in a gold gown.

Sheldon takes his first engineering class with Professor Boucher. Meanwhile, Meemaw and Dale help take care of his ex-wife, June.

While Sheldon battles the mysterious Grand Chancellor of the university over science requirements, Mary makes a shocking discovery about Georgie.

While George Sr. plays handyman at Brenda Sparks' house, Sheldon gets the science yips and has to learn how not to think.

Sheldon gets a dorm room all to himself, which soon becomes the campus hotspot. Meanwhile, Meemaw gets an unwanted business partner.

Sheldon acts as Mary's spy when he's forced to spend the night at church for a youth lock-in. Meanwhile, Georgie gets attracted to an older woman.

Sheldon attends his first comic book convention, and Mary tries selling makeup.

A Tie Breaker & A Huge Mistake. Tensions rise when new co-owners Georgie and Ruben realise they can't agree on anything. Jim struggles to find his purpose now that he's retired.

Georgie's upset when Mandy's new role as weekend weather girl gets her more attention from the men in town, and Connor turns to Jim for help.

Sheldon and Leonard travel to Texas to end a family feud. The Wolowitz kids inadvertently infest Amy, Bernadette, Howard and Raj with pinkeye.

When Amy's parents and Sheldon's family arrive, everybody is focused on making sure all goes according to plan - everyone except the bride and groom.

Sheldon and Amy's honeymoon runs aground, while Penny and Leonard discover similarities with Amy's parents. Raj insults physicist Neil deGrasse Tyson.

Sheldon and Amy try to figure out what 'perfect gift' Leonard and Penny gave them. Raj asks his father to arrange a marriage for him.

Stuart starts bringing his new girlfriend home, Penny and Leonard talk about starting a family, and Raj explores an arranged marriage.

Sheldon won't tell anyone why he's never mentioned his childhood friend Tam. Bernadette and Penny take out Raj's fiancée to get the skinny on her.

Amy doesn't have time to work on a project, so Sheldon goes to great lengths to ensure she can work with him, even if it means sabotaging her career.

When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation. Leonard is shocked that Penny doesn't remember their first kiss.

Leonard is caught in a tough spot when he's responsible for distributing extra grant money. Bernadette turns the backyard playhouse into a hideaway.

Sheldon tries to bond with Amy's father, but Howard lures Mr. Fowler away with magic tricks. Raj and Anu try to get physical for the first time.

Sheldon and Amy are devastated learning that Super Asymmetry has been discovered and disproven. Bernadette asks Denise to help her win a videogame.

A VHS tape inspires Sheldon to not give up on his and Amy's theory. Bernadette turns into a pageant mom over Howard's Magic Castle audition.

Penny and Leonard organise a paintball game that results in mayhem. Raj catches Anu with her ex, and Stuart doesn't want to move in with Denise.

Penny's ex, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard to help. Raj attempts to mend things with his ex-fiancée.

Sheldon and Amy's theory is proven by two physicists, who then try to kick Amy off the Nobel nomination. Bernadette has a big success at work.

Sheldon helps Bernadette and Howard navigate bureaucratic paperwork. Leonard is disappointed when his friends exclude him from a scientific project.

Penny tries to seduce an abstaining Leonard to ruin his 'donation' for her ex-boyfriend and his wife. Raj's cancelled bachelor party takes a turn.

The gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game. Deception and betrayal are the path to make it to the one open seat.

While Bernadette is away and Howard is in charge of the kids, Sheldon finds a book on experimenting on kids. The guys plus Amy make a day of it.

Pemberton and Campbell charm America, so Sheldon and Amy bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side.

Joey Fatone pulls back the curtain on the boy band machine, revealing how fame is manufactured - and the toll it takes on the artists.