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Howard and Leonard are putting in late nights at work, Raj and a pregnant Bernadette spend a day together, and Penny and Amy take in a faculty party.

Sheldon and Amy decide to move in together. Meanwhile, Howard and Bernadette become upset when Raj learns the gender of their baby before they do.

Sheldon accuses Amy of not following the bathroom schedule. Meanwhile, Howard and Bernadette's staycation is interrupted by hot tub interlopers.

Feeling his baby kick sends Howard on a baby-items buying binge with Raj, Sheldon and Amy host a brunch, and Penny is invited to a sci-fi convention.

Amy fibs about repairs being made to her apartment. Later, they present an episode of 'Fun with Flags' in Penny's apartment.

A successful gene experiment leaves Sheldon excited to procreate with Amy. Raj is reluctant to reveal what his new woman does for a living.

A coworker's MacArthur Genius fellowship award leaves Sheldon stone cold jealous. Howard finds a remote-control Stephen Hawking action figure.

A divide develops between Sheldon and Leonard when divvying up their shared belongings. Raj and Stuart battle to provide Bernadette the most help.

Josh makes a regrettable decision. Forrest struggles to leave Sheena. Aviva sees a new side to Stig. Lisa confronts Daniel about his other wife.

Colt recovers from surgery while living with Cortney and her new boyfriend, and Vanja breaks her celibacy and meets Tony's parents.

The Wind Beneath My Nose Bumps. Elaine calls the growth on her love handle her third breast. Jessica's cyst is close to her eye and could be dangerous for Dr. Lee to remove.

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.

Despite being so big from overeating that she can barely leave the house, Lacey has found love with Ricky. But his interfering sister is complicating things.

'Bridezilla' Lucy has already lost two stone for her wedding, but the weight keeps dropping off! Can Jo, Al and seamstress, Marianna, make alterations in time.

Bride Karen has a wedding dress emergency when the dress she ordered from Australia doesn't turn up! Can Jo and Al think up a solution with four weeks to go.

Karen's mum wants to get her daughter into her wedding dress, but can't seem to get it right! A last minute dress panic sees Jo and Al come to the rescue.

Bride Zara wants to sparkle - but having never worn a dress before, she's out of her comfort zone. The pressure is on for Jo and Al to make her feel like a lady.

Sheldon visits CalTech for the first time. Meanwhile, Georgie is furious when Mary listens in on a phone call with his girlfriend.

Sheldon accuses Dr. Sturgis of plagiarism. Georgie has an awkward run-in with Veronica while on a date with his new girlfriend, Jana.

When George Sr. accidentally lands the school librarian in the hospital, the Cooper family look after her. Meemaw gives Georgie relationship advice.

When Sheldon learns the house next door is for sale, he looks for the perfect neighbours. Missy pitches against her boyfriend at the baseball game.

Sheldon has a scientific breakthrough at the dentist. Dale and Meemaw go to the casino. Georgie makes a mistake when he's left in charge of the store.

Sheldon discovers that Mary's been keeping a secret about his future. Also, Meemaw is furious when she learns that Dale fired Georgie.

Mandy makes a controversial remark on live TV that puts her job, Georgie's business, and the family's reputation at risk.

Mandy struggles to celebrate Georgie's 21st birthday after hitting a rough patch in her career.

Leonard and Sheldon consider dropping by George Lucas' Skywalker Ranch when a speaking engagement puts them nearby.

Sheldon and Amy reach a crossroad, a man claiming to be Wolowitz's half-brother shows up, and Penny and Leonard argue live on Wil Wheaton's podcast.

NASA asks Raj to craft a message for aliens in the event of contact, and Penny must choose between an audition or her job in pharmaceutical sales.

Wolowitz and Sheldon can't get a drone to fly, Leonard nearly misses giving a commencement address, and Raj pits his parents against each other.

Leonard and Sheldon's mothers come to town to celebrate their sons getting an award, but the opinionated women engage in an altercation over religion.

Leonard and Penny are pressured to set a wedding date by Sheldon, whose relationship with Amy has taken an interesting turn.

Penny has a problem dealing with Leonard's confession about having kissed another woman, while Sheldon is confused about Amy calling a time out.

To ease Penny's mind, Leonard pays a visit to the woman he kissed during his expedition to the North Sea. Sheldon's breakup leads him to retaliate.

The guys surprise Leonard with a belated bachelor-party weekend in Mexico, but their plans hit a bump in the road when they get a flat tire.

Sheldon reverts to 2003 when he learns that Leonard and Penny are moving in together, while Howard and Raj form a band to play at the comic store.

When Barry Kripke gives the guys fencing lessons, he makes a point of letting Sheldon know he's interested in dating Amy.

A helium shortage leads Sheldon and Leonard to do business with a dealer in the black market to acquire some of the element for an experiment.

Sheldon's interview for a 'Star Trek' documentary focusing on Spock turns up a shocking revelation about his breakup with Amy.

When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy.

Sheldon and Amy spend Thanksgiving at the aquarium, Wolowitz volunteers at a soup kitchen, and Penny realises that Leonard knows a lot about her.

God only knows what song is constantly playing in Sheldon's head, but it reminds him of Amy and leads to a surprising revelation.

Professor Proton visits Sheldon in a dream and gives him Obi-Wan-like advice about whether to go see the new Star Wars film or spend time with Amy.

Penny entices Leonard to meet with a psychiatrist, Stuart moves out of the Wolowitz house, and Howard and Bernadette find themselves at a loss.

Dealing with an under-the-weather Sheldon is draining for Penny, Leonard and the gang so they decide to treat themselves to a Sheldon-less weekend.

Sheldon's Meemaw visits and there's friction between her and Amy, which intensifies after the elderly woman blurts out a secret about Sheldon.

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

Erica stabbed her hand with a pencil 45 years ago and believes the lead remains trapped in her palm. Paula's swollen feet emit a foul odour.

Alyse suffers from a burning rash. Terry struggles with a painful butt cheek lipoma. James has 'demons' on his back that are ruining his life.

Bob suffers from mysterious open-wound sores all over his body. Virginia can't wait to have her lump removed. Tom is desperate to find a cure for his itchy skin.

After graduating high school, Sheldon has a breakdown when he realises he may not be ready for college. Also, Dale tries to make amends with Meemaw.

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

Julian's food addiction has led him to weigh more than 800 pounds and left him almost housebound. He faces a battle to lose weight and save his marriage.

Rosie worries she's gained weight and won't fit into her wedding dress. With just 4 weeks until she weds, will Jo and Al have time to make it a perfect fit.

Sue hates trying on dresses so only shops online. In her quest for a dream wedding dress, she's bought ten, but doesn't like any of them! Can Jo and Al help.

Danielle's medical condition causes her to be unsteady on her feet. Worried she'll trip walking down the aisle, she needs major alterations. Jo and Al step in.

Kimberley has a last-minute wedding dress disaster, and the train she added looks more like a tail. Can Jo and Al even get this anxious bride to the church.

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.

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.

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

Sheldon and Amy celebrate Valentine's Day, Leonard and Penny feel the pangs of aging, and Howard and Bernadette find a surprise in their hot tub.

The gang learns Bernadette is pregnant and celebrates with karaoke. Meanwhile, Howard freaks out, convinced he must make more money for the baby.

Sheldon and the gang celebrate his birthday and he's surprised by a special guest.

Howard reconsiders entering into a legal partnership with Leonard and Sheldon, and the women offer Raj dating advice.

Sheldon shocks Amy with a startling revelation after she buys him a laptop. Raj throws Leonard and Howard under the bus when they lie to their wives.

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Raj goes all out with pregnancy gifts.

During a group get-together, a minor argument between Sheldon and Leonard turns into a heated debate, leaving the rest of the gang to choose sides.

Sheldon stays with Bernadette while the rest of the gang attends an event where they run into Penny's former boyfriend and meet Raj's girlfriend.

Sheldon hires Stuart to spend the day with Amy. Meanwhile Leonard's mother visits, and Penny just can't seem to connect with her.

Leonard's recently divorced parents roll into town, as does Sheldon's holy-roller mother, and all hell breaks loose.

The gang deals with the awkward aftermath of an overnight liaison between Sheldon's mum and Leonard's dad. Penny's dysfunctional family is in town.

An Air Force bigwig approaches the guys about their revolutionary invention, and Bernadette is upset with Penny after she accidentally leaks a secret.

Howard and Leonard are putting in late nights at work, Raj and a pregnant Bernadette spend a day together, and Penny and Amy take in a faculty party.

Sheldon and Amy decide to move in together. Meanwhile, Howard and Bernadette become upset when Raj learns the gender of their baby before they do.

Sheldon accuses Amy of not following the bathroom schedule. Meanwhile, Howard and Bernadette's staycation is interrupted by hot tub interlopers.

Feeling his baby kick sends Howard on a baby-items buying binge with Raj, Sheldon and Amy host a brunch, and Penny is invited to a sci-fi convention.

Amy fibs about repairs being made to her apartment. Later, they present an episode of 'Fun with Flags' in Penny's apartment.

A successful gene experiment leaves Sheldon excited to procreate with Amy. Raj is reluctant to reveal what his new woman does for a living.

A coworker's MacArthur Genius fellowship award leaves Sheldon stone cold jealous. Howard finds a remote-control Stephen Hawking action figure.

A divide develops between Sheldon and Leonard when divvying up their shared belongings. Raj and Stuart battle to provide Bernadette the most help.

Mandy's attempt to help Missy with boys backfires when Mary finds out and Georgie is caught in the crossfire.

When CeeCee loses her favourite toy, Mandy and Meemaw take it as an opportunity to make some money.

Roisin and Sara take spooky trip across Transylvania, exploring scary Dracula tourist attractions, a Dragon theme park, and an odd massage chair.

A US Army colonel and a civilian woman supervising him must track down stolen Russian nuclear weapons before they're used by terrorists.