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The Killer Robot Instability. Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the guys are depending on him for. S2, Ep12

The Friendship Algorithim. Looking to get friendly with Barry Kripke to gain access to a piece of high-tech lab equipment, Sheldon develops a flowchart process to make friends. S2, Ep13

The Financial Permeability. When Sheldon loans money to Penny so she can pay her rent, it leads to Leonard coming face-to-face with her ex, Kurt. S2, Ep14

The Maternal Capacitance. A visit from Leonard's mother ends up bringing him and Penny closer. S2, Ep15

The Cushion Saturation. Paintball leads to a squabble between Sheldon and Penny as well as romance between Howard and Leslie. S2, Ep16

The Terminator Decoupling. The gang is thrilled to see Summer Glau is also aboard their train to San Francisco. Sheldon frets over having forgotten a paper he wants to present. S2, Ep17

The Work Song Nanocluster. Penny's business selling hair accessories out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge. S2, Ep18

The Dead Hooker Juxtaposition. Penny feels threatened when another sexy woman moves into the apartment building and angered when she senses the guys are being taken advantage of. S2, Ep19

The Hofstadter Isotope. A fellow comic book enthusiast's hitting on Penny leads to Leonard, Raj and Howard going to a bar's Ladies' Night. S2, Ep20

The Vegas Renormalization. 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. S2, Ep21

Plum Nose. Brittney has hundreds of tiny bumps over her chest that have destroyed her confidence. John has a nose the size of a plum. Dr. Lee's friend drops in. S5, Ep6

Amputation Deliberation. Tyler's hands are so cracked and painful that he considers getting them amputated. And Ebonee covers the tiny bumps around her eyes with sunglasses. S5, Ep8

Leaky Legs. Dr. Lee has a surprise for Paula, who has odoriferous and painful legs. Mike must get rid of the bump on his head before two major life events. S5, Ep10

Sex, Lies And Helicopters. Late at night, Molly catches Carl coming out of Victoria's room, leaving her questioning whether or not she will tell Mike. S4, Ep20

This Old Peggy. Mike wants Peggy to see a doctor after her bathtub falls through the ceiling. S4, Ep21

A Patch, A Modem And A Zantac. After being dismissed in class, Sheldon is determined to prove a visiting NASA representative wrong and starts studying theoretical physics. S1, Ep6

A Brisket, Voodoo And Cannonball Run. Meemaw refuses to give George Sr. her brisket recipe. The kids try to think of ways to resolve this family feud. S1, Ep7

Cape Canaveral. George takes his sons to see a space shuttle launch. Meanwhile, Mary, Meemaw and Missy have a girl's night at the salon. S1, Ep8

Spock, Kirk And Testicular Hernia. George Sr. makes a deal with Sheldon to tutor his brother when Georgie's poor grades threaten his place on the football team. S1, Ep9

Tara's Story. Tara is single mother of two who feels like a prisoner in her own body. Riddled with joint pain she is determined to lose the weight - and see her kids grow up. S2, Ep8

Better than the First. Bride Mackenzie knows exactly what she wants - a dress that makes her look like Jessica Rabbit. Will her consultant Britney find the perfect gown? S10, Ep3

Race to the Altar. Bride Dawn is looking for a princess gown for her wedding, but no dress is living it up to her or her family's standards. Will her dress dream ever come true? S10, Ep4

More than a Wedding. Cheryl and Krisin have recently beaten cancer and Jennifer is battling a kidney disease. For these brides, their weddings are a celebration of love and life. S10, Ep5

Family Rules. Tanya takes her outspoken family to the salon to help her find a blush-coloured dress. But no one is as honest like a family - can the consultant keep the peace? S10, Ep6

Teleshopping.

Teleshopping.

Eagle Feather, String Bean. Sheldon interviews with a school for gifted children. Much to their surprise, the rest of the family struggle with his absence. S1, Ep10

Demons, Sunday School. A worried Mary sends Sheldon to Sunday school after she finds him playing Dungeons & Dragons with Tam and Billy. S1, Ep11

A Computer, A Plastic Pony. Sheldon asking for a computer has unforeseen consequences for his parents, prompting Mary and the twins to move in with Meemaw. S1, Ep12

A Sneeze, Detention. Sheldon's germophobia lands him in detention when flu season hits Medford and he takes extreme measures to remain healthy. S1, Ep13

Potato Salad, A Broomstick. When Mary takes a job at the church, Sheldon and Missy are left home alone for the very first time. S1, Ep14

Dolomite, Apple Slices. Sheldon makes a new friend who introduces him to a new field of science, while his parents disagree on how to handle Sheldon's blossoming social life. S1, Ep15

Classified Material Turbulence. 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. S2, Ep22

The Monopolar Expedition. 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. S2, Ep23

The Electric Can Opener. Discovering Leonard, Raj and Howard fudged the results of his Arctic research expedition, a disgraced Sheldon heads home to Texas. S3, Ep1

The Jiminy Conjecture. Sheldon and Howard wager comic books over a cricket's species. Meanwhile, a less-than-perfect romantic night agonizes Leonard and Penny. S3, Ep2

The Gothowitz Deviation. Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behaviour modification experiment on Penny. S3, Ep3

The Pirate Solution. 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. S3, Ep4

Creepy Candy Coating Corollary. 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. S3, Ep5

The Cornhusker Vortex. 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. S3, Ep6

The Guitarist Amplification. 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. S3, Ep7

The Vengeance Formulation. Barry Kripke pranks Sheldon during his spot on NPR, leaving him wanting vengeance. Bernadette pressures Wolowitz to define their relationship. S3, Ep9

The Gorilla Experiment. Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment. S3, Ep10

The Maternal Congruence. A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon. S3, Ep11

The Psychic Vortex. 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. S3, Ep12

The Bozeman Reaction. A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system. S3, Ep13

The Einstein Approximation. Stuck on the solution to a physics problem, Sheldon tries different methods to change his thinking, including working at The Cheesecake Factory. S3, Ep14

The Large Hadron Collision. 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. S3, Ep15

The Excelsior Acquisition. 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. S3, Ep16

The Precious Fragmentation. 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. S3, Ep17

The Pants Alternative. 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. S3, Ep18

The Wheaton Recurrence. Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.' S3, Ep19

Splurges And Secrets. A financial windfall leads Georgie to make a questionable purchase. Meanwhile, Audrey and Jim butt heads over old secrets. S2, Ep20

Funky Chili. Mandy and Jim butt heads when they take over the store for a sick Georgie and Ruben. Meanwhile, Audrey panics when Connor rekindles an old flame. S2, Ep21

Dara Ó Briain serves up more comedic aces with the help of guests Rhys James, Hugh Dennis, Sara Pascoe, Scott Bennett, Michelle Wolf and Glenn Moore. S1, Ep2

Dara Ó Briain is back with a summer run of topical chat and games featuring Rhys James, Ed Gamble, Laura Lexx, Sara Pascoe, Josh Pugh and Ahir Shah. S1, Ep1

Dara Ó Briain serves up more comedic aces with the help of guests Rhys James, Hugh Dennis, Sara Pascoe, Scott Bennett, Michelle Wolf and Glenn Moore. S1, Ep2

Norway. Roisin and Sara explore Bergen and Voss on a budget, dining at a Norwegian buffet, playing black metal and canoeing to find rubbish on a fjord. S1, Ep2

Killer Asteroids, Oklahoma. A disappointing loss at the science fair sparks an existential crisis and sends Sheldon's life in a new direction. S1, Ep16

Jiu-Jitsu, Bubble Wrap. When Sheldon is bullied by an unlikely character, Mary and George disagree on how to handle the situation. S1, Ep17

A Mother, A Child. When Mary bans Sheldon from reading a mature comic book, Sheldon decides it's time to assert his independence from his mother. S1, Ep18

Gluons, Guacamole. When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by a professor. S1, Ep19

James' Story. 38-year-old James has lost both his father and sister to obesity-related issues. Now, at a staggering 650lbs, he is facing the exact same fate. S2, Ep7

Father of the Bride. Bride Katie wants a mermaid style dress but her mom would prefer to see her in a traditional ballgown. Can consultant Jenny find a dress to please both? S10, Ep7

Sisters Know Best. Broadway star Kristen Chenoweth is helping her best friend to find a gown with glitz and glam. Plus, two set of sisters can't agree on a dress style. S10, Ep8

A Family Affair. Saralyn is in need of two dresses in order to share her wedding with her sister and Rachel brings her sister, a former Bachelor contestant, to help out. S10, Ep9

You're Making Me Blush. Kara wants a red dress, but her future mother in-law has more traditional gown ideas. Sheena needs a colourful dress to wear to her Indian wedding reception. S10, Ep10

Teleshopping.

Teleshopping.

A Tire Convention. Georgie discovers that Jim's annual tire convention trip isn't what he says it is. Meanwhile, Mandy has doubts about the strength of her marriage. S1, Ep9

A House Divided. Audrey and Mary go to war over CeeCee and Georgie, and Mandy can't help but take sides. S1, Ep10

Killer Asteroids, Oklahoma. A disappointing loss at the science fair sparks an existential crisis and sends Sheldon's life in a new direction. S1, Ep16

Jiu-Jitsu, Bubble Wrap. When Sheldon is bullied by an unlikely character, Mary and George disagree on how to handle the situation. S1, Ep17

A Mother, A Child. When Mary bans Sheldon from reading a mature comic book, Sheldon decides it's time to assert his independence from his mother. S1, Ep18

Gluons, Guacamole. When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by a professor. S1, Ep19

The Psychic Vortex. 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. S3, Ep12

The Bozeman Reaction. A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system. S3, Ep13

The Einstein Approximation. Stuck on the solution to a physics problem, Sheldon tries different methods to change his thinking, including working at The Cheesecake Factory. S3, Ep14

The Large Hadron Collision. 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. S3, Ep15

The Excelsior Acquisition. 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. S3, Ep16

The Precious Fragmentation. 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. S3, Ep17

The Pants Alternative. 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. S3, Ep18

The Wheaton Recurrence. Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.' S3, Ep19

Working For The Enemy. Audrey's past rears its head when Georgie leaves the tire store to work for Fred Fagenbacher, Jim's longtime nemesis. S1, Ep11

Typhoid Georgie. 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. S1, Ep12

A Dog, A Squirrel. A heated argument erupts between the Coopers and their neighbours when a new dog terrorises Sheldon. S1, Ep20

Summer Sausage, Pocket Poncho. While Sheldon is obsesses over Meemaw's budding relationship with his mentor, Dr. Sturgis, George and Mary attempt to bond with their other kids. S1, Ep21

Ice Cream, Gentlemen Callers. When Meemaw is pursued by two gentlemen callers, Sheldon interferes, forcing her to set some ground rules. S1, Ep22

A High-Pitched Buzz. Sheldon dismantles the refrigerator to stop an annoying hum and then must get a paper route to pay for the repairs. S2, Ep1

The Spaghetti Catalysis. 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. S3, Ep20

The Plimpton Stimulation. Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido. S3, Ep21

The Staircase Implementation. 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. S3, Ep22

The Lunar Excitation. 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. S3, Ep23

The Robotic Manipulation. Howard uses a robotic arm for his own pleasure. Sheldon goes on a date with Amy Farrah Fowler, and Penny finds herself accompanying them. S4, Ep1

Cruciferous Veg Amplification. 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. S4, Ep2

The Zazzy Substitution. Sheldon breaks up with Amy Farrah Fowler, and the guys worry when he starts replacing her with cats. S4, Ep3

The Hot Troll Deviation. Wolowitz is embarrassed when a secret of his is revealed, and Sheldon and Raj battle at work. S4, Ep4

Dara Ó Briain serves up more comedic aces with the help of guests Rhys James, Hugh Dennis, Sara Pascoe, Scott Bennett, Michelle Wolf and Glenn Moore. S1, Ep2

After two top figure skaters' glittering rivalry gets them banned from the sport, they're forced to team up as a pair to get back into competition.