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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.