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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.