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To Show Or Not To Show. Sacha wants a dress that pushes the envelope and helps her shine. And, new mum Amy wants a gown that will really wow her fiancé.

Sophie wants to show it all off for her wedding day but finding the line between sexy and trashy is proving tricky. Plus, Sasha is back for her first fitting.

Rochelle and her mother can only agree on one thing - a dress with a mermaid style silhouette. Bride Nicole is struggling with the idea of glitz on her frock.

Frankie is sad when informed that her days of having kids are over. Sue and Axl are shocked when her roommate and Sean Donahue start flirting.

Frankie and Mike frantically attempt to shut off the water when the pipes burst. The Hecks call a meeting to deal with their bickering.

Mike's dislike of dentistry leads to escalating falsehoods to avoid having his toothache fixed. Brick attempts to write a Scottish-themed rap musical.

When Mary's faith is shaken by a tragedy in the community, Sheldon becomes an unlikely ally.

When George Sr. asks Sheldon to keep a secret from Mary, the stress of not being honest drives Sheldon to hide out at Tam's for his first sleepover.

Dr. Sturgis recommends Sheldon and Missy for a university research study on twins, and Mary is unhappy when the test results go to Sheldon's head.

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.

Amy has a meltdown due to the pressure associated with winning a Nobel Prize. Raj and Howard try to relive the good old days.

Raj is worried people won't take him seriously in his own field after publishing a paper that suggests he may have discovered alien life.

Lexie confesses to Sue that she has a crush on Axl. Mike hires high school coach Babbitt to pull the quarry softball team out of their slump.

Axl thinks the universe is trying to tell him something when he runs into just about all of his ex-girlfriends at a St. Patrick's Day party.

Bill Norwood is so upset with Mike for poaching his plumber their friendship could be at risk. Brick spends a weekend with Axl at college to party.

Mary clashes with Sheldon's drama teacher Mr. Lundy over plans for a Halloween haunted house fundraiser for the church.

Sheldon gets into trouble with fellow child genius Paige at the Science Museum, while George Sr. is forced to play therapist to Paige's parents.

When Meemaw gives Sheldon his first video game, it takes over their lives. Meanwhile, George Sr. gets jealous when Georgie bonds with Herschel.

Kripke has proof that Dr. Pemberton plagiarized his thesis, and Sheldon and Amy aren't sure whether they should turn him in or not.

Leonard is surprised when Beverly is kind to him on a visit, until he finds out the real reason she's there. Denise and Stuart overstay their welcome.

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.

Andrea and Tammy get bad news about their wedding, and Amy's opportunity-of-a-lifetime may tear the family apart as Tammy makes a surprise request.

Nesha's BBW speed dating event gets off to a rocky start. Jaz pushes for independence and attempts to train Nesha and Nana for their 5K.

Dara Ó Briain extracts humour from current events with guests Rhys James, Neil Delamere, Milton Jones, Zoe Lyons, Sara Pascoe and Ahir Shah.

Lexie confesses to Sue that she has a crush on Axl. Mike hires high school coach Babbitt to pull the quarry softball team out of their slump.

Axl thinks the universe is trying to tell him something when he runs into just about all of his ex-girlfriends at a St. Patrick's Day party.

Bill Norwood is so upset with Mike for poaching his plumber their friendship could be at risk. Brick spends a weekend with Axl at college to party.

Half of Mary's body is a size 18 while the other is an 8. Anthony's cyst is in the area called the Triangle of Death, and Shane wants to get a lump off his back.

Single mother-of five-Cynthia works as a special needs teacher, but that is becoming impossible at 610 pounds - now both her life and her family at risk.

The Feel Good, Look Good Show. Emily hates to shop, so she's relying on her BFFs - will they choose style or comfort? Hayley's pregnancy means a new gown to accommodate a baby bump.

Ellie has her heart set on a vintage lace fishtail dress, but her mum is angling for a ball gown. Plus, Laura finds the perfect gown with a sexy fit and flare.

Lauren wants two dresses, one for the ceremony and a slinky number for the reception. Can her pragmatic entourage convince her to stick to just one dress.

Lexie confesses to Sue that she has a crush on Axl. Mike hires high school coach Babbitt to pull the quarry softball team out of their slump.

Axl thinks the universe is trying to tell him something when he runs into just about all of his ex-girlfriends at a St. Patrick's Day party.

Bill Norwood is so upset with Mike for poaching his plumber their friendship could be at risk. Brick spends a weekend with Axl at college to party.

Mary clashes with Sheldon's drama teacher Mr. Lundy over plans for a Halloween haunted house fundraiser for the church.

Sheldon gets into trouble with fellow child genius Paige at the Science Museum, while George Sr. is forced to play therapist to Paige's parents.

When Meemaw gives Sheldon his first video game, it takes over their lives. Meanwhile, George Sr. gets jealous when Georgie bonds with Herschel.

Kripke has proof that Dr. Pemberton plagiarized his thesis, and Sheldon and Amy aren't sure whether they should turn him in or not.

Leonard is surprised when Beverly is kind to him on a visit, until he finds out the real reason she's there. Denise and Stuart overstay their welcome.

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.

Frankie and Mike send Brick to a religious weekend camp. He is shocked to discover that his bunkmate is the boy he was switched at birth with.

Frankie is thrilled when Axl agrees to let her take him shopping to help him pick out a suit. Mike threatens to get rid of the pool if no one's using it.

Frankie frantically searches the house for Axl's missing graduation gift. Sue decides that she wants to make a sweet video for Mike's upcoming birthday.

Sheldon studies his family for a psychology project when their Thanksgiving dinner turns into a fight after George Sr. is offered a job in Oklahoma.

When Sheldon learns that stunted childhoods can turn people into outcasts, he tries to act his age. Meemaw and Dr. Sturgis's relationship is tested.

While Missy unknowingly becomes Sheldon's test subject, Georgie joins Mary's Bible study to spend more time with his crush, Veronica.

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 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.

Ravi receives life-changing surgery to remove the huge tumours that cover his face. Lauren has 24-hour treatment to prolong her life.

Natalie suffered major, life-changing burns after a bonfire explosion. Now, aged 18, she's not letting her burns hold her back.

Belinda's lump on her neck causes her to be immobile. Nicole won't get married until she gets her arm pit lump removed. And, Nick unwisely removed a lipoma at home.

Frankie and Mike send Brick to a religious weekend camp. He is shocked to discover that his bunkmate is the boy he was switched at birth with.

Frankie is thrilled when Axl agrees to let her take him shopping to help him pick out a suit. Mike threatens to get rid of the pool if no one's using it.

Frankie frantically searches the house for Axl's missing graduation gift. Sue decides that she wants to make a sweet video for Mike's upcoming birthday.

The Curious Case Of The Pooting Cyst. Diane has thousands of tumours all over her body that have ruined her life. Plus, Will is worried his shoulder lump will be ripped open at work.

Self-described 'secret eater' Doug can hide his snacking but his obesity is stopping him from living a full life with his wife, Ashley, who is now demanding a change.

The Princess At Any Cost Show. Hayley falls in love with a princess gown that threatens the budget. Plus, real-life princess Nana has her final fitting, but will her mother approve.

Perfectionist Ligia wants a flowing Grecian gown, while her mom and granny are set on a fitted silhouette. Can David find a dress that will please everyone.

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.

Frankie and Mike send Brick to a religious weekend camp. He is shocked to discover that his bunkmate is the boy he was switched at birth with.

Frankie is thrilled when Axl agrees to let her take him shopping to help him pick out a suit. Mike threatens to get rid of the pool if no one's using it.

Frankie frantically searches the house for Axl's missing graduation gift. Sue decides that she wants to make a sweet video for Mike's upcoming birthday.

Sheldon studies his family for a psychology project when their Thanksgiving dinner turns into a fight after George Sr. is offered a job in Oklahoma.

When Sheldon learns that stunted childhoods can turn people into outcasts, he tries to act his age. Meemaw and Dr. Sturgis's relationship is tested.

While Missy unknowingly becomes Sheldon's test subject, Georgie joins Mary's Bible study to spend more time with his crush, Veronica.

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 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.

Axl pleads with his teacher to let him take his final college exam or he won't be able to graduate. Sue and Brad perform an impromptu musical number.

Having finally graduated college, Axl tells Frankie and Mike that he's planning on going to Europe over the summer with Kenny.

Axl returns home from his summer trip to Europe, sporting a man-bun and with a new, chill European outlook on life.

When Sheldon has to spend a few days in the hospital, he turns into the world's worst patient, and his behaviour takes a toll on everyone.

While Sheldon attempts to build a nuclear reactor to power the neighbourhood, Georgie is heartbroken when he learns that Veronica has a boyfriend.

Sheldon uses his new friendship with the school bully to boss Georgie around. Also, Missy steals Meemaw's makeup for Picture Day.

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.

The gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll decide who can date her.

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

Penny's breakup spurs Leonard to summon the courage to ask her out, and they both go to Sheldon for advice on their upcoming date.

Penny opens up to Sheldon after a less-than-stellar first date with Leonard, placing him in the uncomfortable position of having to keep a secret.

Seeing Penny with another guy sends Leonard back to Leslie Winkle, much to Sheldon's dismay.

Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistently pesters Sheldon for advice.

Dara Ó Briain extracts humour from current events with guests Rhys James, Neil Delamere, Milton Jones, Zoe Lyons, Sara Pascoe and Ahir Shah.

A box of old videotapes from 1988 reveals the terrifying origins of the evil haunting that plagues sisters Katie and Kristi.

Axl pleads with his teacher to let him take his final college exam or he won't be able to graduate. Sue and Brad perform an impromptu musical number.

Having finally graduated college, Axl tells Frankie and Mike that he's planning on going to Europe over the summer with Kenny.

Axl returns home from his summer trip to Europe, sporting a man-bun and with a new, chill European outlook on life.

Louis is covered in scaly skin that makes him feel like an alligator. Jennifer can't focus on her career due to a large unicorn-like lump on her forehead.

Diana is a prisoner to her 620-lb body. Desperate to break free of her food addiction, she embarks on a weight loss journey in order to regain her life.

Mike Sorrentino arrives at Kleinfeld to help Melissa find her wedding gown. However, Mike and his brothers steal the spotlight.

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.

Axl pleads with his teacher to let him take his final college exam or he won't be able to graduate. Sue and Brad perform an impromptu musical number.

Having finally graduated college, Axl tells Frankie and Mike that he's planning on going to Europe over the summer with Kenny.

Axl returns home from his summer trip to Europe, sporting a man-bun and with a new, chill European outlook on life.

When Sheldon has to spend a few days in the hospital, he turns into the world's worst patient, and his behaviour takes a toll on everyone.

While Sheldon attempts to build a nuclear reactor to power the neighbourhood, Georgie is heartbroken when he learns that Veronica has a boyfriend.

Sheldon uses his new friendship with the school bully to boss Georgie around. Also, Missy steals Meemaw's makeup for Picture Day.

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.

The gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll decide who can date her.

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

Penny's breakup spurs Leonard to summon the courage to ask her out, and they both go to Sheldon for advice on their upcoming date.

Penny opens up to Sheldon after a less-than-stellar first date with Leonard, placing him in the uncomfortable position of having to keep a secret.

Seeing Penny with another guy sends Leonard back to Leslie Winkle, much to Sheldon's dismay.

Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistently pesters Sheldon for advice.

Sue and Lexie try to move back into their apartment but find it's been sublet to a man who refuses to leave. Axl gets a job driving the school bus.

Frankie is excited when Axl invites her and Mike to meet and have dinner with girlfriend Lexie's rich parents, Tammy and Bennett.

Orson Murder Mystery. Frankie discovers that a woman died in the bathtub of the Heck house close to 50 years ago. Frankie and Brick become convinced that she was murdered.

Sheldon and Dr. Sturgis have a fight when Dr. Sturgis marks a question wrong on Sheldon's test. Mary takes over for Pastor Jeff when he's out sick.

Things spiral out of control when Sheldon boycotts his favourite bread company. Georgie consoles Veronica when she's dumped by her boyfriend.

Inspired by his hero, Albert Einstein, Sheldon tries his hand at the violin. Also, Mary and Meemaw secretly buy a pregnancy test.

Full of confidence following being named one of People's 30 to Watch Under 30, Raj hits on Penny and becomes impossibly arrogant.

An intervention is used to try to force Sheldon to overcome his fear of driving.

Sheldon and his friends are mystified when a younger undergraduate student is attracted to him.

When Sheldon bans Penny from the apartment, she decides to retaliate. Howard and Raj search for the America's Next Top Model house.

Sheldon wants to use an alternate version of rock-paper-scissors to help resolve conflicts. A girl Wolowitz has a major crush on falls for Leonard.

Sheldon is over-exuberant that Leonard finally has a girlfriend matching his high standards.

Leonard seeks Penny's counsel when his relationship with Stephanie takes. Sheldon's hypochondriac tendencies get the better of him.

Sheldon irks the gangs with his obsession with proper Christmas gift protocol. Leonard's crushed when Penny dates a colleague of his.

On the explosive season finale, everything comes to a head. Marissa has a change of heart, and Rod questions Maxwell's intentions.