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Penny's business selling hair accessories out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge.

Penny feels threatened when another sexy woman moves into the apartment building and angered when she senses the guys are being taken advantage of.

A fellow comic book enthusiast's hitting on Penny leads to Leonard, Raj and Howard going to a bar's Ladies' Night.

Leonard and Raj take Wolowitz to Las Vegas to help him get over his break-up. Sheldon locks himself out and has only one other place to stay: Penny's.

Stuart asks Leonard's advice for a date with Penny. Wolowitz realises there's an error in a toilet he designed for the International Space Station.

The guys receive a prestigious offer to work over the summer at the North Pole, and Penny's resultant behaviour leaves Leonard unsure if he should go.

Discovering Leonard, Raj and Howard fudged the results of his Arctic research expedition, a disgraced Sheldon heads home to Texas.

Sheldon and Howard wager comic books over a cricket's species. Meanwhile, a less-than-perfect romantic night agonizes Leonard and Penny.

Dr. Lee and Lyndsey help David with a jaw lump and Carla's bulge raises concern. James wants 70 skin tags removed so he is ready for beach season.

Dr. Lee and Zoe treat Mary Ann's crusty skin. Isaiah ignores a lump on his spine and Maressa fears treating the oozing skin covering her ankles.

Bryan's head bumps puzzle doctors. Chalamar hates her chest lump and Dr. Lee and Dr. Lyndsey help Devi regain her bikini body and confidence.

Drag queen Tameru is covered in tiny clusters of cysts on his chest, arms and neck. He discovered his bumps over a decade ago and still doesn't know what they are.

The Coopers help a broken-hearted Pastor Jeff through a rough patch in his marriage. Meanwhile, Sheldon pressures church members for donations.

Sheldon invites the entire school to a party for the Nobel Prize announcements. Meanwhile, Meemaw learns more about Dr. Sturgis's past.

Eric hopes Dr. Lee can remove the giant growth from his backside. Plus, Michael makes jokes, but he knows the bump on his head is anything but funny.

Octavia has been bedbound for nearly a year. But, with her best friend as her worst enabler, can she choose between old habits and a new life.

That's How You Dress A Lady. Randy's runway show is finally here and it's his big opportunity to show he's back as a designer for good! And bride Jaqueline is at odds with her mum.

After Dr. Sturgis experiences a nervous breakdown, Mary worries Sheldon is headed down a similar path. Georgie finds he has a knack for sales.

Without Dr. Sturgis's university class, Sheldon takes his education into his own hands. Mary helps Pastor Jeff avoid temptation with his girlfriend.

Sheldon leaves town after a fight with Meemaw and his parents. Meanwhile, Georgie tries to impress Veronica with his new business venture.

Sheldon's obsession with The Lord of the Rings leads to an unhealthy habit. Missy asks her dad to teach her how to play catch.

After being released from the psychiatric hospital, Dr. Sturgis unexpectedly breaks up with Meemaw.

A Parasol And A Hell Of An Arm. A church carnival leads Missy to try out for the baseball team. Meanwhile, Meemaw struggles after her breakup with Dr. Sturgis.

Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behaviour modification experiment on Penny.

Facing a return to India, Raj needs a job desperately enough to consider working for Sheldon. Howard becomes a third wheel to Leonard and Penny.

Sheldon looks forward to squaring off against a Star Trek actor in a fantasy card game tournament. Wolowitz cashes in on an old pact with Leonard.

Hoping to fit in with Penny's football-loving friends, Leonard gets tutored in the sport by Sheldon. Raj is furious over the loss of his patang.

Leonard and Penny's first big fight sees Sheldon playing mediator due to childhood trauma that means he can't be around loud verbal conflicts.

Barry Kripke pranks Sheldon during his spot on NPR, leaving him wanting vengeance. Bernadette pressures Wolowitz to define their relationship.

Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment.

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon.

Leonard is aghast to find out that Penny believes in psychics. Sheldon tries to assist Koothrappali in picking up a girl at a university party.

A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.

Stuck on the solution to a physics problem, Sheldon tries different methods to change his thinking, including working at The Cheesecake Factory.

When Leonard is offered a trip to Switzerland on Valentine's Day to see a particle accelerator, he must choose between taking Penny or Sheldon.

An appearance in traffic court comes at the worst possible time for Sheldon, the same day Stan Lee is appearing at the comic book store.

The guys go to a garage sale and find a ring from the Lord of the Rings films, and the rare find threatens their friendship.

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him prepare for the big night.

Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.

Following Leonard and Penny's break up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido.

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting the story of how he met and moved in with Sheldon.

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.

Audrey's past rears its head when Georgie leaves the tire store to work for Fred Fagenbacher, Jim's longtime nemesis.

Georgie worries he's letting his family down when he's forced to stay home ill, and Mandy worries about how her career will affect her marriage.

Ed Gamble hosts as comedians defend unacceptable opinions: Vittorio Angelone on a misunderstood Trump and Fatiha El-Ghorri backing arranged marriage.

Ed Gamble hosts as comedians Ivo Graham back state support for public school kids and Lucy Beaumont says all Prime Ministers should be Southerners.

Ed Gamble hosts as comedians defend unacceptable opinions: Vittorio Angelone on a misunderstood Trump and Fatiha El-Ghorri backing arranged marriage.

Robert has thousands of unique bumps on his arms that Dr. Lee has never seen. Stuart's cluster of back bumps disgusts his wife but thrills Dr. Lee.

Sheldon starts the first internet flame war, and Meemaw is unhappy when George spends time with her new boyfriend.

The university tries to recruit Sheldon, through George. Georgie gets a job working for Meemaw's new boyfriend. Mary decides to rid her home of greed.

Mary gets Pastor Jeff involved when Sheldon isn't invited to Billy's birthday party. George, meanwhile, has 'male-bonding time' with Dr. Sturgis.

Sheldon fakes being sick to avoid a swim test at school. Meanwhile, Dr. Sturgis spies on Meemaw's new boyfriend.

Siblings Robin and Chris are both obese and already lost a sibling to obesity. Chris's son Garrett, already 600lbs at age 20, wants to lose weight.

From celebrity brides like Elle King to entourages featuring Kathy Griffin and Joan Rivers, Randy introduces his top star moments in the series.

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

Mandy tries to make things right with Pastor Jeff when she learns her controversial comments have hurt the tire store's business.

Sheldon starts the first internet flame war, and Meemaw is unhappy when George spends time with her new boyfriend.

The university tries to recruit Sheldon, through George. Georgie gets a job working for Meemaw's new boyfriend. Mary decides to rid her home of greed.

Mary gets Pastor Jeff involved when Sheldon isn't invited to Billy's birthday party. George, meanwhile, has 'male-bonding time' with Dr. Sturgis.

Sheldon fakes being sick to avoid a swim test at school. Meanwhile, Dr. Sturgis spies on Meemaw's new boyfriend.

An appearance in traffic court comes at the worst possible time for Sheldon, the same day Stan Lee is appearing at the comic book store.

The guys go to a garage sale and find a ring from the Lord of the Rings films, and the rare find threatens their friendship.

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him prepare for the big night.

Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.

Following Leonard and Penny's break up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido.

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting the story of how he met and moved in with Sheldon.

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.

Frankie is struggling in her career, Sue has auditioned for show choir, and Brick wants Frankie to dress as a superhero for his class presentation.

Frankie tries to save her job by organising a publicity stunt involving a car filled with jellybeans. Sue fails swim team try-outs.

Frankie and Mike's romantic plans for their anniversary are thwarted by a sick Brick, a lovesick Sue, and a learner's permit-toting Axl.

George and Meemaw struggle to manage the Cooper household while Mary plans Pastor Jeff's wedding.

Sheldon catches a struggling Paige shoplifting. Meanwhile, George Sr. is furious when Georgie tries to buy his way out of chores.

George and Georgie go camping with Meemaw's new boyfriend, Dale, but things get complicated when her ex-boyfriend tags along.

Howard uses a robotic arm for his own pleasure. Sheldon goes on a date with Amy Farrah Fowler, and Penny finds herself accompanying them.

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.

Ed Gamble hosts as comedians defend unacceptable opinions: Vittorio Angelone on a misunderstood Trump and Fatiha El-Ghorri backing arranged marriage.

Street-smart Detroit cop Axel Foley is back in L.A. on a mission to find the man who killed his boss in Detroit, aided by old pal Rosewood.