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Sheldon dismantles the refrigerator to stop an annoying hum and then must get a paper route to pay for the repairs.

When Dr. Sturgis bonds with Paige, another 10-year-old genius, Sheldon gets jealous. Meanwhile, Mary invites Paige's family over for a play date.

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.

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

Howard and Raj set Sheldon up on an Internet dating site. Penny discovers that she can't go back to dating dumb jocks after dating Leonard.

Sheldon calculates that he'll be dead before technology exists to download his consciousness into a robot, so he goes on a healthy-living binge.

Sheldon breaks up with Amy Farrah Fowler, and the guys worry when he starts replacing her with cats.

Wolowitz is embarrassed when a secret of his is revealed, and Sheldon and Raj battle at work.

Sheldon meets Amy's mum and comes to the realisation he no longer wants to see Amy, and Leonard realises everyone is in a relationship except for him.

When Raj's sister has a one-day layover, he forbids the others from hooking up with her, unaware she and Leonard already did long ago.

The rest of the gang is interviewed by the FBI for Wolowitz's security clearance, with Sheldon accidentally letting slip some damaging information.

The guys camp out to see a print of Raiders of the Lost Ark with 21 extra seconds and are outraged to see Wil Wheaton and his friends skip the line.

Penny asks Leonard to lie to her visiting father, while Howard, Raj and Bernadette spend all night looking through a telescope.

Amy crushes on one of Penny's dim ex-boyfriends, Zack. Raj and Wolowitz argue over who'd be the better superhero.

The guys get Zack and Penny to join their Justice League costume for a New Year's Eve bash at the comic book store.

Their friendship becomes strained when Sheldon tries to take over Leonard's creation of a smartphone application that solves differential equations.

Howard is jealous when Bernadette runs into her old boyfriend at a science event they're attending.

Sheldon wants acting lessons from Penny, hoping they will make him a better teacher.

After meeting at a fundraising gala, an aged but wealthy Caltech donor makes Leonard ponder if he's willing to have sex with her to secure a donation.

Howard contemplates a serious decision in his relationship with Bernadette, and Leonard and Raj's sister start seeing each other again.

Sheldon is in a crisis when he realises he's not the epicentre of the group, so he decides to find new friends.

Leonard has a tough choice to make when Priya asks him to stop spending time with Penny, and Howard keeps pestering Sheldon with a magic trick.

The guys become sleuths to find out who hacked Sheldon's online-game account.

Sheldon and Amy decide to start rumours about themselves as a social test. Howard takes his relationship with Bernadette to an even higher level.

Georgie digs into Mandy's past when he finds she's been hiding thousands of dollars of debt. Mandy tries to right her wrongs by going back to work.

Things get awkward when Georgie and Mandy try to make new friends. Meanwhile, Jim and Audrey get competitive playing a game with Connor.

With humanity facing extinction, it's up to Optimus Prime and the Autobots to save the world - but the government has turned against them.

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.

Jen has growths on her ears that cause her depression, pain and vertigo. Plus, Juliet is in distress because of the bumps all over her neck and chest.

The team help a bride who has tried on over 150 dresses, one who has already got two wedding gowns, and one who sets a record for their longest appointment.

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.

A priest wants a smooth outfit for her wedding day in Sicily. Plus, Rachel is concerned her recent weight gain will hamper her search for a dress.

Nikki has a budget of £5,000 to find the perfect dress for her big day. Plus, Lisa seeks a unique outfit that will make her stand out on social media.

When Joyce invites Vince to attend her high school reunion, he confesses to Mike that he never graduated high school.

Victoria panics as her 30th birthday approaches - and drags Mike and Molly into the drama of her life crisis.

Mike feels pressured when Peggy's new boyfriend asks whether he and Molly hear wedding bells in their future.

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.

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.

Howard is jealous when Bernadette runs into her old boyfriend at a science event they're attending.

Sheldon wants acting lessons from Penny, hoping they will make him a better teacher.

After meeting at a fundraising gala, an aged but wealthy Caltech donor makes Leonard ponder if he's willing to have sex with her to secure a donation.

Howard contemplates a serious decision in his relationship with Bernadette, and Leonard and Raj's sister start seeing each other again.

Sheldon is in a crisis when he realises he's not the epicentre of the group, so he decides to find new friends.

Leonard has a tough choice to make when Priya asks him to stop spending time with Penny, and Howard keeps pestering Sheldon with a magic trick.

The guys become sleuths to find out who hacked Sheldon's online-game account.

Sheldon and Amy decide to start rumours about themselves as a social test. Howard takes his relationship with Bernadette to an even higher level.

Adjusting to life as an engaged couple, trouble arises when Molly wants to start planning the wedding and Mike wants to go fishing with the guys.

Mike's mum, Peggy, is in for a big surprise when she celebrates her boyfriend, Dennis' birthday.

When Mike moves in with Molly and her family, he has to adjust from life in his bachelor pad to a house full of women.

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

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.

Priya uses her legal expertise to rip apart Sheldon's roommate agreement, and the women take the flustered Sheldon out dancing.

Raj makes an attempt to cure his phobia of talking to women, and Penny spies on Leonard and Priya with the help of Bernadette.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Penny worries that she's screwed things up permanently with her friends after her night with Raj, while Sheldon takes command of the paintball team.

Leonard and Amy get to know each other better at a co-worker's wedding. Howard and Bernadette spend the weekend with Mrs. Wolowitz.

Raj is upset he's the only one of the four guys who's not in a relationship, so Penny sets out to find the perfect date.

Sheldon and Leonard get invited to a housewarming party at Wil Wheaton's house. Howard gets an out-of-this-world opportunity.

For some child stars from '90s family shows, the transition after their wholesome roles leads them down a dark path with tragic consequences.

Johnny Lewis has everything any young actor could ever dream of. But, not even a spot on Hollywood's A-List could keep him from the most terrifying role of his life.

Gerald returns to see Dr. Lee and a hand specialist about a huge, intrusive bump on his finger. Vinnie has an embarrassing birthmark on his neck.

Lee Nose Best! Tony has large growths on his nose that impair his breathing. Can Dr. Lee help? And, Marie has an unsightly lump on her forehead that makes her a hermit.

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.

After losing six stone, Steph is nervous about finding a dress that suits her figure. Plus, Gok helps Esther pick out an outfit with a budget of £3,000.

60-year-old Wendy refuses to be defined by her age and wants a revealing showstopper gown. Plus, Amy has fallen out of love with her dream dress.

Adjusting to life as an engaged couple, trouble arises when Molly wants to start planning the wedding and Mike wants to go fishing with the guys.

Mike's mum, Peggy, is in for a big surprise when she celebrates her boyfriend, Dennis' birthday.

When Mike moves in with Molly and her family, he has to adjust from life in his bachelor pad to a house full of women.

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

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.

Priya uses her legal expertise to rip apart Sheldon's roommate agreement, and the women take the flustered Sheldon out dancing.

Raj makes an attempt to cure his phobia of talking to women, and Penny spies on Leonard and Priya with the help of Bernadette.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya.

Penny worries that she's screwed things up permanently with her friends after her night with Raj, while Sheldon takes command of the paintball team.

Leonard and Amy get to know each other better at a co-worker's wedding. Howard and Bernadette spend the weekend with Mrs. Wolowitz.

Raj is upset he's the only one of the four guys who's not in a relationship, so Penny sets out to find the perfect date.

Sheldon and Leonard get invited to a housewarming party at Wil Wheaton's house. Howard gets an out-of-this-world opportunity.

While Molly's trying to save money for their wedding, Mike is lured into buying Vince's 1957 Chevy Bel Air - without telling her first.

Despite Mike's good intentions, he adds fuel to the fire when he finds himself caught in the middle of a fight between Molly and her family.

Mike's spooked when Molly's boss invites them to a party on Halloween, a holiday he dreads.

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

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.

Craving a little motherly love, Sheldon competes with the gang for his mother's attention when she comes to visit.

A cute comic book artist tests Leonard's relationship with Priya, while Sheldon, getting into the Halloween spirit, tries to scare the guys.

Amy is heartbroken when Bernadette and Penny go shopping for wedding dresses without her.

Can friends with benefits still be friends without? Leonard and Penny try hanging out alone, while Sheldon must overcome his fear of birds.

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.

The Autobots race against the Decepticons to reach the Cybertronian spacecraft, which could turn the tide in their final battle.