Sheldon and Amy build a blanket fort - and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.

Darlene learns some shocking news about an old friend; the Conners come together to help someone who is close to them.

A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard; a blackout at Mrs. Wolowitz's results in a final dinner in her honor.

When Sheldon and Leonard are asked to speak at UC Berkeley, they take a detour in hope of meeting an idol; Raj and Amy try to settle a dispute between Howard and Bernadette with a game of pingpong.

Sheldon and Amy build a blanket fort - and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.

When the guys agree to do something the girls like, Sheldon and Leonard end up having a confrontation.

Monica and Phoebe compete to find Rachel a date; Joey tries to con his friends into buying him a new refrigerator.

Chandler jeopardizes Joey's chances for the lead role in a TV series when he forgets to take down a message.

Ross recruits some friends to go with him on his first meeting with Elizabeth's father (Bruce Willis); Phoebe makes Chandler and Monica paranoid by chronicling their every move.

Elizabeth's father (Bruce Willis) threatens to get Ross fired if he does not stop dating his daughter.

When the guys agree to do something the girls like, Sheldon and Leonard end up having a confrontation.

Sheldon asks his friends to challenge him in hope of achieving a scientific breakthrough; Wolowitz invents a game about Raj.

Becky is working double shifts and taking classes at the community college, resulting in less time with her daughter; Dan decides to foster an elderly dog.

Darlene learns some shocking news about an old friend; the Conners come together to help someone who is close to them.

Davis shapes up; Brent and Lacey compete to get a secret from Karen.

Brent enters into a long-term relationship; Wanda's telescope.

At the Summer Solstice Deck Party, the locals compete for a seat in the sun, Brent sells popsicles and Karen and Davis must share a gun.

Lacey and Brent help Hank build a zip-line downtown; Davis and Karen crack down on the free corner; Oscar and Emma win a free robot vacuum.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be surprised when they discover that they're instant contestants; Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be surprised when they discover that they're instant contestants; Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Davis shapes up; Brent and Lacey compete to get a secret from Karen.

Brent enters into a long-term relationship; Wanda's telescope.

At the Summer Solstice Deck Party, the locals compete for a seat in the sun, Brent sells popsicles and Karen and Davis must share a gun.

Lacey and Brent help Hank build a zip-line downtown; Davis and Karen crack down on the free corner; Oscar and Emma win a free robot vacuum.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be surprised when they discover that they're instant contestants; Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be surprised when they discover that they're instant contestants; Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Davis shapes up; Brent and Lacey compete to get a secret from Karen.

Brent enters into a long-term relationship; Wanda's telescope.

At the Summer Solstice Deck Party, the locals compete for a seat in the sun, Brent sells popsicles and Karen and Davis must share a gun.

Lacey and Brent help Hank build a zip-line downtown; Davis and Karen crack down on the free corner; Oscar and Emma win a free robot vacuum.

Dan encounters a surprise visitor who shares some unsolicited advice, leaving him feeling guilty; Darlene welcomes a new employee to Wellman Plastics.

Monica and Phoebe compete to find Rachel a date; Joey tries to con his friends into buying him a new refrigerator.

Chandler jeopardizes Joey's chances for the lead role in a TV series when he forgets to take down a message.

Ross recruits some friends to go with him on his first meeting with Elizabeth's father (Bruce Willis); Phoebe makes Chandler and Monica paranoid by chronicling their every move.

Elizabeth's father (Bruce Willis) threatens to get Ross fired if he does not stop dating his daughter.

The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.

Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.

When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores - with a little help from his friends.

Dan encounters a surprise visitor who shares some unsolicited advice, leaving him feeling guilty; Darlene welcomes a new employee to Wellman Plastics.

Mark is stressed and exhausted from studying for an important entrance exam, so Darlene steps in to help, but her plan backfires.

When the gang teases Robin about not being a real New Yorker, she sets out to prove them wrong by racing to catch a glimpse of Woody Allen.

Ted becomes conflicted after meeting an attractive woman who is passionate about saving the landmark building being torn down for his new project.

Marshall and Lily try to figure out how to conceive a baby with the gender of their choice; Robin's perky new co-anchor irritates her.

When Zoey enrolls in Ted's class, she tries to convince his students to help save the building from being torn down for his project; Marshall and Lily notice Robin marching in the Halloween parade of shame.

The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.

Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.

Sheldon and Leonard must defend themselves from an online bully's criticism after they co-publish a paper; Bernadette, Penny and Amy confront embarrassing moments during a girls night.

While the gang waits for the reopening of Stuart's comic book store Wolowitz gets some shocking news; Penny has trouble taking her own advice; Leonard and Raj think they spot Nathan Fillion at a restaurant.

When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores - with a little help from his friends.

Mark is stressed and exhausted from studying for an important entrance exam, so Darlene steps in to help, but her plan backfires.

The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.

Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.

When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores - with a little help from his friends.

Sheldon and Leonard must defend themselves from an online bully's criticism after they co-publish a paper; Bernadette, Penny and Amy confront embarrassing moments during a girls night.

When the gang teases Robin about not being a real New Yorker, she sets out to prove them wrong by racing to catch a glimpse of Woody Allen.

Ted becomes conflicted after meeting an attractive woman who is passionate about saving the landmark building being torn down for his new project.

Marshall and Lily try to figure out how to conceive a baby with the gender of their choice; Robin's perky new co-anchor irritates her.

When Zoey enrolls in Ted's class, she tries to convince his students to help save the building from being torn down for his project; Marshall and Lily notice Robin marching in the Halloween parade of shame.

Sheldon and Leonard must defend themselves from an online bully's criticism after they co-publish a paper; Bernadette, Penny and Amy confront embarrassing moments during a girls night.

While the gang waits for the reopening of Stuart's comic book store Wolowitz gets some shocking news; Penny has trouble taking her own advice; Leonard and Raj think they spot Nathan Fillion at a restaurant.

Dan encounters a surprise visitor who shares some unsolicited advice, leaving him feeling guilty; Darlene welcomes a new employee to Wellman Plastics.

Mark is stressed and exhausted from studying for an important entrance exam, so Darlene steps in to help, but her plan backfires.

A simple jar of jellybeans turns Dog River's park from a dilapidated local hazard into full-blown scandal.

Brent helps Lacey buy a new car; Karen and Davis try to break the idea of cops in donut shops.

Karen is upset when Emma cuts Brent's hair; Hank promises to stain Lacey's deck.

When a morning radio DJ impersonates Brent on his show, he goes out of his way to prove it's not him; Lacey is upset with her delivery service.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be surprised when they discover that they're instant contestants; Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Taxi passengers win money by answering trivia questions.

A simple jar of jellybeans turns Dog River's park from a dilapidated local hazard into full-blown scandal.

Brent helps Lacey buy a new car; Karen and Davis try to break the idea of cops in donut shops.

Karen is upset when Emma cuts Brent's hair; Hank promises to stain Lacey's deck.

When a morning radio DJ impersonates Brent on his show, he goes out of his way to prove it's not him; Lacey is upset with her delivery service.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be surprised when they discover that they're instant contestants; Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Taxi passengers win money by answering trivia questions.

A simple jar of jellybeans turns Dog River's park from a dilapidated local hazard into full-blown scandal.

Brent helps Lacey buy a new car; Karen and Davis try to break the idea of cops in donut shops.

Karen is upset when Emma cuts Brent's hair; Hank promises to stain Lacey's deck.

When a morning radio DJ impersonates Brent on his show, he goes out of his way to prove it's not him; Lacey is upset with her delivery service.

Darlene makes a decision about her trip to Hawaii, leading to a heated encounter with Barb; Becky gives a presentation on addiction to Mark's class.

When the gang teases Robin about not being a real New Yorker, she sets out to prove them wrong by racing to catch a glimpse of Woody Allen.

Ted becomes conflicted after meeting an attractive woman who is passionate about saving the landmark building being torn down for his new project.

Marshall and Lily try to figure out how to conceive a baby with the gender of their choice; Robin's perky new co-anchor irritates her.

When Zoey enrolls in Ted's class, she tries to convince his students to help save the building from being torn down for his project; Marshall and Lily notice Robin marching in the Halloween parade of shame.

While facing dramatic changes in his relationship with Amy, Sheldon pushes Penny and Leonard to choose a wedding date.

Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.

Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags"; Bernadette feels bad about keeping a secret.

Darlene makes a decision about her trip to Hawaii, leading to a heated encounter with Barb; Becky gives a presentation on addiction to Mark's class.

Two proposals bring change to the Conner family; Jackie uses her "Jeopardy!" infamy to her advantage.

The gang attends a black-tie fundraiser at the Natural History Museum; Ted meets Zoey's husband, the captain.

When Barney finds a copy of the kids' show featuring Robin's alter ego, the friends learn more about her past as a performer than they expected.

The gang, minus Ted, parties all night with The Blitz (Jorge Garcia), an old friend from college; Ted is forced to spend Thanksgiving with Zoey.

Ted asks Zoey's husband (Kyle MacLachlan) to hang out; Robin and Marshall decide to spend some time together.

While facing dramatic changes in his relationship with Amy, Sheldon pushes Penny and Leonard to choose a wedding date.

Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.

Penny and Sheldon design an experiment - as a joke - to make participants fall in love; Howard and Bernadette get into trouble at the airport.

Amy finds out that Sheldon applied for a one-way mission to colonize Mars; a trip to the pet store leads to a fight; Leonard has a surprise for Penny; Raj is busted while snooping in Emily's apartment.

Conan races down the autobahn, tries to master "schuhplattler" and visits a dominatrix while in historic Berlin, Germany.

While facing dramatic changes in his relationship with Amy, Sheldon pushes Penny and Leonard to choose a wedding date.

Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.

Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags"; Bernadette feels bad about keeping a secret.

Penny and Sheldon design an experiment - as a joke - to make participants fall in love; Howard and Bernadette get into trouble at the airport.

The gang attends a black-tie fundraiser at the Natural History Museum; Ted meets Zoey's husband, the captain.

When Barney finds a copy of the kids' show featuring Robin's alter ego, the friends learn more about her past as a performer than they expected.

The gang, minus Ted, parties all night with The Blitz (Jorge Garcia), an old friend from college; Ted is forced to spend Thanksgiving with Zoey.

Ted asks Zoey's husband (Kyle MacLachlan) to hang out; Robin and Marshall decide to spend some time together.

Penny and Sheldon design an experiment - as a joke - to make participants fall in love; Howard and Bernadette get into trouble at the airport.

Amy finds out that Sheldon applied for a one-way mission to colonize Mars; a trip to the pet store leads to a fight; Leonard has a surprise for Penny; Raj is busted while snooping in Emily's apartment.

Darlene makes a decision about her trip to Hawaii, leading to a heated encounter with Barb; Becky gives a presentation on addiction to Mark's class.

Two proposals bring change to the Conner family; Jackie uses her "Jeopardy!" infamy to her advantage.

Oscar and Emma argue over the room temperature; Karen makes Lacey regret disobeying a local yield sign.

Brent and Lacey mentor high school students; Emma decides to be nicer to Oscar.

Brent helps Hank tear down a barn; Emma receives multiple manicures; David hires Wanda to snap pictures of him working.

Davis is locked in a jail cell to raise money for charity; Wanda tries to install a toilet.

Karen prepares an eyewitness testimony; Hank tries becoming a rodeo clown.

Brent talks Hank into starting a blog; Lacey's friend gets her own cooking show; Wanda helps Davis with his taxes.

A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills; Penny is compelled to tell her family that she and Leonard eloped.

An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.

Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.

Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to to find Amy a new man on a dating app.

Sheldon struggles to keep his emotions in check when he is interviewed for a documentary about Spock; Penny and Leonard make a surprising discovery; Wolowitz and Bernadette get into a disagreement about remodeling his childhood home.

Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon; Penny and Bernadette decide to spy when Amy is secretive about who she is dating.

Amy and Sheldon spend Thanksgiving at the aquarium - as friends; Wolowitz volunteers at the soup kitchen with Raj, Emily and Bernadette; Penny realizes that Leonard knows her better than she thought.

Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner; Koothrappali and Wolowitz are obsessed with a fan of their band.

After dating for more than five years, Amy and Sheldon spend the night together for the first time; Leonard, Wolowitz, and Koothrappali must decide what to do with an extra movie ticket.

Leonard agrees to meet with a psychiatrist (Jane Kaczmarek) on Penny's behalf; Sheldon and Koothrappali work together on an astronomical discovery; Wolowitz and Bernadette struggle with their feelings when Stuart moves out.

After dealing with Sheldon while he was sick, Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.

Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy; Raj questions his relationship with Emily after meeting someone new.

Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Penny and Leonard wrestle with getting older; Howard and Bernadette make a discovery in their hot tub; Raj is torn between Emily and another woman.

The gang celebrates news of Bernadette's pregnancy by singing karaoke; Wolowitz's reaction to the pregnancy announcement worries Bernadette; Wolowitz believes he needs to make more money to support his growing family.

A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills; Penny is compelled to tell her family that she and Leonard eloped.

An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.

Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.

Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to to find Amy a new man on a dating app.

Sheldon struggles to keep his emotions in check when he is interviewed for a documentary about Spock; Penny and Leonard make a surprising discovery; Wolowitz and Bernadette get into a disagreement about remodeling his childhood home.

Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon; Penny and Bernadette decide to spy when Amy is secretive about who she is dating.

Amy and Sheldon spend Thanksgiving at the aquarium - as friends; Wolowitz volunteers at the soup kitchen with Raj, Emily and Bernadette; Penny realizes that Leonard knows her better than she thought.

Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner; Koothrappali and Wolowitz are obsessed with a fan of their band.

After dating for more than five years, Amy and Sheldon spend the night together for the first time; Leonard, Wolowitz, and Koothrappali must decide what to do with an extra movie ticket.

Leonard agrees to meet with a psychiatrist (Jane Kaczmarek) on Penny's behalf; Sheldon and Koothrappali work together on an astronomical discovery; Wolowitz and Bernadette struggle with their feelings when Stuart moves out.

After dealing with Sheldon while he was sick, Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.

Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy; Raj questions his relationship with Emily after meeting someone new.

Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Penny and Leonard wrestle with getting older; Howard and Bernadette make a discovery in their hot tub; Raj is torn between Emily and another woman.

The gang celebrates news of Bernadette's pregnancy by singing karaoke; Wolowitz's reaction to the pregnancy announcement worries Bernadette; Wolowitz believes he needs to make more money to support his growing family.

A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills; Penny is compelled to tell her family that she and Leonard eloped.

An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.

Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.

Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to to find Amy a new man on a dating app.

Sheldon struggles to keep his emotions in check when he is interviewed for a documentary about Spock; Penny and Leonard make a surprising discovery; Wolowitz and Bernadette get into a disagreement about remodeling his childhood home.

Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon; Penny and Bernadette decide to spy when Amy is secretive about who she is dating.

Amy and Sheldon spend Thanksgiving at the aquarium - as friends; Wolowitz volunteers at the soup kitchen with Raj, Emily and Bernadette; Penny realizes that Leonard knows her better than she thought.

Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner; Koothrappali and Wolowitz are obsessed with a fan of their band.

After dating for more than five years, Amy and Sheldon spend the night together for the first time; Leonard, Wolowitz, and Koothrappali must decide what to do with an extra movie ticket.

Leonard agrees to meet with a psychiatrist (Jane Kaczmarek) on Penny's behalf; Sheldon and Koothrappali work together on an astronomical discovery; Wolowitz and Bernadette struggle with their feelings when Stuart moves out.

After dealing with Sheldon while he was sick, Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.

Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy; Raj questions his relationship with Emily after meeting someone new.

Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Penny and Leonard wrestle with getting older; Howard and Bernadette make a discovery in their hot tub; Raj is torn between Emily and another woman.

The gang celebrates news of Bernadette's pregnancy by singing karaoke; Wolowitz's reaction to the pregnancy announcement worries Bernadette; Wolowitz believes he needs to make more money to support his growing family.

Brent realizes that Corner Gas may not actually be within the town of Dog River.

Emma gives Davis and Wanda piano lessons; Lacey deals with a broken arm.

Brent discovers a newfound love of his childhood toys when Emma gives them to Hank.

Brent is in the doghouse when Hank proves to be a better son to Emma.

Lacey thinks Davis and Karen are more than work partners; Hank and Oscar are two no-nonsense census takers out to count the names and tally the numbers.

Davis buys a table hockey game for the station and finds that Karen is good at it.

Chandler asks Phoebe to help him choose a special ring; Rachel urges Paul (Bruce Willis) to express his feelings.

Monica and Chandler encounter Richard (Tom Selleck), Monica's former boyfriend, in a romantic restaurant.

Monica and Chandler encounter Richard (Tom Selleck), Monica's former boyfriend, in a romantic restaurant.

Monica feels that Rachel is trying to steal the spotlight from her engagement; Chandler worries about his performance in the bedroom.

Monica learns what her parents have done with her wedding fund; Joey teases Rachel about her late-night reading material.

Chandler's efforts to bond with Monica's father (Elliott Gould) backfire during a racquetball game; Rachel tries to teach Joey how to sail; Monica tries to replicate Phoebe's grandmother's cookie recipe.

Rachel considers hiring an inexperienced but handsome man over a better qualified woman as her executive assistant.

Rachel makes her handsome new assistant (Eddie Cahill) hang out with Joey rather than the women in her office.

Monica makes Chandler apologize to an old girlfriend (Stacy Galina) for leaving her because she was fat; Monica struggles to select a maid of honor.

Ross' doctoral dissertation is stored in a remote corner of the university library frequently used by students having sex; Rachel and Phoebe bond with Joey's date (Kristin Davis), then try to convince him to continue seeing her.

Joey may have ruined Rachel's chances with Tag (Eddie Cahill) when he opens his mouth during Thanksgiving dinner.

Rachel finds it embarrassing that she is paying the way for her hunky new boyfriend (Eddie Cahill), who is also her assistant at work.

Ross' attempts to introduce his son, Ben, to Hanukkah are thwarted by the tyke's like of all things Christmas.

Phoebe and Joey are at odds when she tries to cancel their weekly dinner plans so she can meet an old beau.

Chandler asks Phoebe to help him choose a special ring; Rachel urges Paul (Bruce Willis) to express his feelings.

Monica and Chandler encounter Richard (Tom Selleck), Monica's former boyfriend, in a romantic restaurant.

Monica and Chandler encounter Richard (Tom Selleck), Monica's former boyfriend, in a romantic restaurant.

Monica feels that Rachel is trying to steal the spotlight from her engagement; Chandler worries about his performance in the bedroom.

Monica learns what her parents have done with her wedding fund; Joey teases Rachel about her late-night reading material.

Chandler's efforts to bond with Monica's father (Elliott Gould) backfire during a racquetball game; Rachel tries to teach Joey how to sail; Monica tries to replicate Phoebe's grandmother's cookie recipe.

Rachel considers hiring an inexperienced but handsome man over a better qualified woman as her executive assistant.

Rachel makes her handsome new assistant (Eddie Cahill) hang out with Joey rather than the women in her office.

Monica makes Chandler apologize to an old girlfriend (Stacy Galina) for leaving her because she was fat; Monica struggles to select a maid of honor.

Ross' doctoral dissertation is stored in a remote corner of the university library frequently used by students having sex; Rachel and Phoebe bond with Joey's date (Kristin Davis), then try to convince him to continue seeing her.

Joey may have ruined Rachel's chances with Tag (Eddie Cahill) when he opens his mouth during Thanksgiving dinner.

Rachel finds it embarrassing that she is paying the way for her hunky new boyfriend (Eddie Cahill), who is also her assistant at work.

Ross' attempts to introduce his son, Ben, to Hanukkah are thwarted by the tyke's like of all things Christmas.

Phoebe and Joey are at odds when she tries to cancel their weekly dinner plans so she can meet an old beau.

Chandler asks Phoebe to help him choose a special ring; Rachel urges Paul (Bruce Willis) to express his feelings.

Monica and Chandler encounter Richard (Tom Selleck), Monica's former boyfriend, in a romantic restaurant.

Monica and Chandler encounter Richard (Tom Selleck), Monica's former boyfriend, in a romantic restaurant.

Monica feels that Rachel is trying to steal the spotlight from her engagement; Chandler worries about his performance in the bedroom.

Monica learns what her parents have done with her wedding fund; Joey teases Rachel about her late-night reading material.

Chandler's efforts to bond with Monica's father (Elliott Gould) backfire during a racquetball game; Rachel tries to teach Joey how to sail; Monica tries to replicate Phoebe's grandmother's cookie recipe.

Rachel considers hiring an inexperienced but handsome man over a better qualified woman as her executive assistant.

Rachel makes her handsome new assistant (Eddie Cahill) hang out with Joey rather than the women in her office.

Monica makes Chandler apologize to an old girlfriend (Stacy Galina) for leaving her because she was fat; Monica struggles to select a maid of honor.

Ross' doctoral dissertation is stored in a remote corner of the university library frequently used by students having sex; Rachel and Phoebe bond with Joey's date (Kristin Davis), then try to convince him to continue seeing her.

Joey may have ruined Rachel's chances with Tag (Eddie Cahill) when he opens his mouth during Thanksgiving dinner.

Rachel finds it embarrassing that she is paying the way for her hunky new boyfriend (Eddie Cahill), who is also her assistant at work.

Ross' attempts to introduce his son, Ben, to Hanukkah are thwarted by the tyke's like of all things Christmas.

Phoebe and Joey are at odds when she tries to cancel their weekly dinner plans so she can meet an old beau.

Lacey and Karen institute an open borrowing policy; Brent watches a horror movie for the first time.

Wanda accidentally breaks Emma's potato bowl; Hank tries to develop his storytelling skills.

Wanda helps Brent investigate his nightmares about being attacked by Michael J. Fox.

Brent uses a drone to harass Oscar; Wanda and Emma attempt to measure the intelligence of turkeys.

Taxi passengers win money by answering trivia questions.

Taxi passengers win money by answering trivia questions.

Lacey and Karen institute an open borrowing policy; Brent watches a horror movie for the first time.

Wanda accidentally breaks Emma's potato bowl; Hank tries to develop his storytelling skills.

Wanda helps Brent investigate his nightmares about being attacked by Michael J. Fox.

Brent uses a drone to harass Oscar; Wanda and Emma attempt to measure the intelligence of turkeys.

Taxi passengers win money by answering trivia questions.

Taxi passengers win money by answering trivia questions.

Lacey and Karen institute an open borrowing policy; Brent watches a horror movie for the first time.

Wanda accidentally breaks Emma's potato bowl; Hank tries to develop his storytelling skills.

Wanda helps Brent investigate his nightmares about being attacked by Michael J. Fox.

Brent uses a drone to harass Oscar; Wanda and Emma attempt to measure the intelligence of turkeys.

After Ben declines Darlene's proposal, she starts to ponder why she tends to be so negative in life, prompting her to start a journey of self-discovery, which leads to Pastor Phil.

Prank masters create gags; pranks involve a flirty old man, a nasty fart box, a mousetrap on a shelf and many more.

Pranks involve a police officer being thrown into the water, a stuffed animal thief, a shrinking pizza and many more.

Pranks involve a reanimated mannequin, an allergic fortune-teller, a bad little dog and many more pranks.

Pranks involve funny police puppets, a pigeon poop sandwich, an explosive potato and many more pranks.

For the first time in nine years, the gang celebrates Sheldon's birthday - surprising him with a special guest.

Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.

Sheldon makes a surprise revelation when Amy buys him a new laptop; Leonard and Wolowitz get sold out by Koothrappali after lying to their wives to attend a movie screening.

After Ben declines Darlene's proposal, she starts to ponder why she tends to be so negative in life, prompting her to start a journey of self-discovery, which leads to Pastor Phil.

Part of Becky's recovery program mandates she make amends with people she has lied to over the years, leading her to meet up again with a former high school friend; Darlene visits with Pastor Phil; Louise continues planning her wedding.

College orientation does not go as Sheldon planned; Mary is invited to a party when she's mistaken for a university student; George Sr. helps Pastor Jeff set up a children's nursery.

Sheldon's first day of college is derailed by his new philosophy teacher, professor Ericson; 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 sends him into a tailspin; George Sr. learns Georgie has been cutting class.

Sheldon and George Sr. dine with President Hagemeyer and a university benefactor; Georgie gives Missy some brotherly advice when Mary won't let her go to the school dance; Dale and June convince Meemaw to attend their son's wedding.

For the first time in nine years, the gang celebrates Sheldon's birthday - surprising him with a special guest.

Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.

A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard; a blackout at Mrs. Wolowitz's results in a final dinner in her honor.

On the coldest day of the year, Jasmeet wakes up with the warm feeling of his turban video going viral; he tries to go about his usual responsibilities.

Sheldon makes a surprise revelation when Amy buys him a new laptop; Leonard and Wolowitz get sold out by Koothrappali after lying to their wives to attend a movie screening.

Part of Becky's recovery program mandates she make amends with people she has lied to over the years, leading her to meet up again with a former high school friend; Darlene visits with Pastor Phil; Louise continues planning her wedding.

For the first time in nine years, the gang celebrates Sheldon's birthday - surprising him with a special guest.

Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.

Sheldon makes a surprise revelation when Amy buys him a new laptop; Leonard and Wolowitz get sold out by Koothrappali after lying to their wives to attend a movie screening.

On the coldest day of the year, Jasmeet wakes up with the warm feeling of his turban video going viral; he tries to go about his usual responsibilities.

College orientation does not go as Sheldon planned; Mary is invited to a party when she's mistaken for a university student; George Sr. helps Pastor Jeff set up a children's nursery.

Sheldon's first day of college is derailed by his new philosophy teacher, professor Ericson; 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 sends him into a tailspin; George Sr. learns Georgie has been cutting class.

Sheldon and George Sr. dine with President Hagemeyer and a university benefactor; Georgie gives Missy some brotherly advice when Mary won't let her go to the school dance; Dale and June convince Meemaw to attend their son's wedding.

A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard; a blackout at Mrs. Wolowitz's results in a final dinner in her honor.

On the coldest day of the year, Jasmeet wakes up with the warm feeling of his turban video going viral; he tries to go about his usual responsibilities.

After Ben declines Darlene's proposal, she starts to ponder why she tends to be so negative in life, prompting her to start a journey of self-discovery, which leads to Pastor Phil.

Part of Becky's recovery program mandates she make amends with people she has lied to over the years, leading her to meet up again with a former high school friend; Darlene visits with Pastor Phil; Louise continues planning her wedding.

Brent decides to try laser eye surgery; police cruiser gets a new slogan.

Brent and Oscar take Davis on a camping trip; Hank finally wakes up with a good hair day.

Karen and Davis discover a mannequin dumped in the woods and try to solve the crime; at Corner Gas, Brent surprises Wanda with a scanner; in The Ruby, Lacey, Oscar, Hank, and Emma get drawn into an unusual bet about hand sanitizer.

Emma sees high art in Hank's hedge-trimming and sells his services around town; prompted by Oscar, Brent tries to collect on the IOUs piling up at Corner Gas, resorting to unorthodox means; Davis and Karen set up the cop shop in The Ruby.

Taxi passengers win money by answering trivia questions.

Taxi passengers win money by answering trivia questions.

Brent decides to try laser eye surgery; police cruiser gets a new slogan.

Brent and Oscar take Davis on a camping trip; Hank finally wakes up with a good hair day.

Karen and Davis discover a mannequin dumped in the woods and try to solve the crime; at Corner Gas, Brent surprises Wanda with a scanner; in The Ruby, Lacey, Oscar, Hank, and Emma get drawn into an unusual bet about hand sanitizer.

Emma sees high art in Hank's hedge-trimming and sells his services around town; prompted by Oscar, Brent tries to collect on the IOUs piling up at Corner Gas, resorting to unorthodox means; Davis and Karen set up the cop shop in The Ruby.

Taxi passengers win money by answering trivia questions.

Taxi passengers win money by answering trivia questions.

Brent decides to try laser eye surgery; police cruiser gets a new slogan.

Brent and Oscar take Davis on a camping trip; Hank finally wakes up with a good hair day.

Karen and Davis discover a mannequin dumped in the woods and try to solve the crime; at Corner Gas, Brent surprises Wanda with a scanner; in The Ruby, Lacey, Oscar, Hank, and Emma get drawn into an unusual bet about hand sanitizer.

Emma sees high art in Hank's hedge-trimming and sells his services around town; prompted by Oscar, Brent tries to collect on the IOUs piling up at Corner Gas, resorting to unorthodox means; Davis and Karen set up the cop shop in The Ruby.

A weather report forecasting that a tornado is headed for Lanford creates chaos and surprises on Dan and Louise's wedding day.

College orientation does not go as Sheldon planned; Mary is invited to a party when she's mistaken for a university student; George Sr. helps Pastor Jeff set up a children's nursery.

Sheldon's first day of college is derailed by his new philosophy teacher, professor Ericson; 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 sends him into a tailspin; George Sr. learns Georgie has been cutting class.

Sheldon and George Sr. dine with President Hagemeyer and a university benefactor; Georgie gives Missy some brotherly advice when Mary won't let her go to the school dance; Dale and June convince Meemaw to attend their son's wedding.

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Koothrappali 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.

The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.

A weather report forecasting that a tornado is headed for Lanford creates chaos and surprises on Dan and Louise's wedding day.

The Conner home is decked out for Halloween, despite the leak in the roof that forces Dan and Louise to cancel their honeymoon; Becky surprises the newlyweds and takes them on a virtual adventure around the world.

During their first night together, Rachel and Tag realize they forgot to ship out an important package at the office.

On her first day as a telemarketer, Phoebe encounters a distraught man (Jason Alexander) who is determined to end his life.

Georgie tries to juggle his mom, his mother-in-law and Mandy on Mother's Day; Audrey wants to meet Connor's girlfriend.

Joey accidentally informs a cast member (Susan Sarandon) that she will be fired so that his character will get her character's brain.

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Koothrappali 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.

When Sheldon and Leonard are asked to speak at UC Berkeley, they take a detour in hope of meeting an idol; Raj and Amy try to settle a dispute between Howard and Bernadette with a game of pingpong.

Sheldon and Amy build a blanket fort - and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.

The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.

The Conner home is decked out for Halloween, despite the leak in the roof that forces Dan and Louise to cancel their honeymoon; Becky surprises the newlyweds and takes them on a virtual adventure around the world.

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Koothrappali 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.

The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.

When Sheldon and Leonard are asked to speak at UC Berkeley, they take a detour in hope of meeting an idol; Raj and Amy try to settle a dispute between Howard and Bernadette with a game of pingpong.

During their first night together, Rachel and Tag realize they forgot to ship out an important package at the office.

On her first day as a telemarketer, Phoebe encounters a distraught man (Jason Alexander) who is determined to end his life.

Georgie tries to juggle his mom, his mother-in-law and Mandy on Mother's Day; Audrey wants to meet Connor's girlfriend.

Joey accidentally informs a cast member (Susan Sarandon) that she will be fired so that his character will get her character's brain.

When Sheldon and Leonard are asked to speak at UC Berkeley, they take a detour in hope of meeting an idol; Raj and Amy try to settle a dispute between Howard and Bernadette with a game of pingpong.

Sheldon and Amy build a blanket fort - and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.

A weather report forecasting that a tornado is headed for Lanford creates chaos and surprises on Dan and Louise's wedding day.

The Conner home is decked out for Halloween, despite the leak in the roof that forces Dan and Louise to cancel their honeymoon; Becky surprises the newlyweds and takes them on a virtual adventure around the world.

Corner Gas goes through a business boom after Hank comes up with an idea to increase tourism.

A cable guy visits Dog River to help produce some local access programming but the town isn't quite ready for prime time; Brent is selected to choose which idea will be produced.

When Wullerton's weekly paper goes under, the gang worries the Dog River Howler will too; Wanda and Emma set out to recruit new advertisers, while Brent helps Oscar start an online version that raises eyebrows; Karen befriends a crow.

Ike's barn burns down and Lacey wants to help; Lacey organizes a bachelor auction to raise money, attracting a mystery woman who bids high for Brent; the more time the two spend together, the more curious the town gets about the woman's identity.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Corner Gas goes through a business boom after Hank comes up with an idea to increase tourism.

A cable guy visits Dog River to help produce some local access programming but the town isn't quite ready for prime time; Brent is selected to choose which idea will be produced.

When Wullerton's weekly paper goes under, the gang worries the Dog River Howler will too; Wanda and Emma set out to recruit new advertisers, while Brent helps Oscar start an online version that raises eyebrows; Karen befriends a crow.

Ike's barn burns down and Lacey wants to help; Lacey organizes a bachelor auction to raise money, attracting a mystery woman who bids high for Brent; the more time the two spend together, the more curious the town gets about the woman's identity.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Corner Gas goes through a business boom after Hank comes up with an idea to increase tourism.

A cable guy visits Dog River to help produce some local access programming but the town isn't quite ready for prime time; Brent is selected to choose which idea will be produced.

When Wullerton's weekly paper goes under, the gang worries the Dog River Howler will too; Wanda and Emma set out to recruit new advertisers, while Brent helps Oscar start an online version that raises eyebrows; Karen befriends a crow.

Ike's barn burns down and Lacey wants to help; Lacey organizes a bachelor auction to raise money, attracting a mystery woman who bids high for Brent; the more time the two spend together, the more curious the town gets about the woman's identity.

Darlene worries about Mark making friends at his new school; Mark turns to Ben for personal advice; Becky finds herself thriving in college and starts thinking about her future plans.

During their first night together, Rachel and Tag realize they forgot to ship out an important package at the office.

On her first day as a telemarketer, Phoebe encounters a distraught man (Jason Alexander) who is determined to end his life.

Georgie tries to juggle his mom, his mother-in-law and Mandy on Mother's Day; Audrey wants to meet Connor's girlfriend.

Joey accidentally informs a cast member (Susan Sarandon) that she will be fired so that his character will get her character's brain.

Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.

Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.

The group struggles through an awkward morning after Sheldon's mother and Leonard's father spend an evening together; Penny's family arrives.

Darlene worries about Mark making friends at his new school; Mark turns to Ben for personal advice; Becky finds herself thriving in college and starts thinking about her future plans.

When Jackie devises an offbeat plan of how to serve the customers at the diner, it's anything but smooth service; Dan begins to sell some furniture to make room for his new bride and her things.

Monica and Chandler fondly reminisce about London until a startling revelation leaves Chandler floored.

Monica regrets telling a woman about a discount bridal shop when they end up competing for a wedding dress.

Joey is overjoyed to be nominated for a "Soapie" award; engaged Monica frets when she realizes she will never experience the thrill of a new relationship again; Ross spots Chandler sneaking out of a male strip club.

Monica is so perturbed by Chandler's instant attraction to her gorgeous visiting cousin (Denise Richards) that she persuades Ross to let her stay at his apartment; Ross finds his attraction to his cousin unsettling.

Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.

Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.

The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.

Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.

The group struggles through an awkward morning after Sheldon's mother and Leonard's father spend an evening together; Penny's family arrives.

When Jackie devises an offbeat plan of how to serve the customers at the diner, it's anything but smooth service; Dan begins to sell some furniture to make room for his new bride and her things.

Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.

Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.

The group struggles through an awkward morning after Sheldon's mother and Leonard's father spend an evening together; Penny's family arrives.

The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.

Monica and Chandler fondly reminisce about London until a startling revelation leaves Chandler floored.

Monica regrets telling a woman about a discount bridal shop when they end up competing for a wedding dress.

Joey is overjoyed to be nominated for a "Soapie" award; engaged Monica frets when she realizes she will never experience the thrill of a new relationship again; Ross spots Chandler sneaking out of a male strip club.

Monica is so perturbed by Chandler's instant attraction to her gorgeous visiting cousin (Denise Richards) that she persuades Ross to let her stay at his apartment; Ross finds his attraction to his cousin unsettling.

The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.

Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.

Darlene worries about Mark making friends at his new school; Mark turns to Ben for personal advice; Becky finds herself thriving in college and starts thinking about her future plans.

When Jackie devises an offbeat plan of how to serve the customers at the diner, it's anything but smooth service; Dan begins to sell some furniture to make room for his new bride and her things.

Karen remembers what it feels like to be a school kid again when she takes up a new form of exercise.

An initially fun game of golf between Brent, Lacey and Hank quickly turns into a round robin of aggravation.

Hank wants to change methods; Wanda uncovers a shocking truth about founding pioneer woman Jane T. Wright; Oscar tries to sneak into the fair despite being banned.

Brent, Hank and Emma have a viral video contest; Karen and Davis try to GPStag the locals; Lacey asks Wanda to secure her WiFi.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Karen remembers what it feels like to be a school kid again when she takes up a new form of exercise.

An initially fun game of golf between Brent, Lacey and Hank quickly turns into a round robin of aggravation.

Hank wants to change methods; Wanda uncovers a shocking truth about founding pioneer woman Jane T. Wright; Oscar tries to sneak into the fair despite being banned.

Brent, Hank and Emma have a viral video contest; Karen and Davis try to GPStag the locals; Lacey asks Wanda to secure her WiFi.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Unassuming people enter a taxi cab as passengers taking a normal ride, only to be shocked when they discover that they're instant contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he escorts them to their destination.

Karen remembers what it feels like to be a school kid again when she takes up a new form of exercise.

An initially fun game of golf between Brent, Lacey and Hank quickly turns into a round robin of aggravation.

Hank wants to change methods; Wanda uncovers a shocking truth about founding pioneer woman Jane T. Wright; Oscar tries to sneak into the fair despite being banned.

Brent, Hank and Emma have a viral video contest; Karen and Davis try to GPStag the locals; Lacey asks Wanda to secure her WiFi.

Louise starts to move into the Conners' home; Dan decides to sell the furniture set he bought for Roseanne when they were first married; Dan soon finds parting with the furniture harder than he thought it would be.

Monica and Chandler fondly reminisce about London until a startling revelation leaves Chandler floored.

Monica regrets telling a woman about a discount bridal shop when they end up competing for a wedding dress.

Joey is overjoyed to be nominated for a "Soapie" award; engaged Monica frets when she realizes she will never experience the thrill of a new relationship again; Ross spots Chandler sneaking out of a male strip club.

Monica is so perturbed by Chandler's instant attraction to her gorgeous visiting cousin (Denise Richards) that she persuades Ross to let her stay at his apartment; Ross finds his attraction to his cousin unsettling.

Wolowitz has a meeting with Colonel Williams, a representative from the Air Force Department of Material Command.

Sheldon tries to stay awake with an energy drink as the gang races to finish its government project on time; Penny and Amy attend a gathering at Bert the Geologist's house; Koothrappali learns Bernadette's true feeling about her pregnancy.

After her apartment floods, Amy suggests that she and Sheldon move in together; Koothrappali finds out the gender of Howard and Bernadette's baby before they do.

Louise starts to move into the Conners' home; Dan decides to sell the furniture set he bought for Roseanne when they were first married; Dan soon finds parting with the furniture harder than he thought it would be.

Darlene brings Nick to the hardware store, where they run into Ben, who invites Nick to join him at The Lunch Box to watch a Bears game; Dan tries to spruce up the bedroom while Louise is out on the road; Jackie meets Logan's mom.

Lily and Marshall receive shocking news that has a profound impact on the gang; Ted begins his duties as best man for an old friend's wedding.

Afraid they will never get pregnant, Lily and Marshall decide to see a specialist; Robin begins her new job.

While on a trip to Minnesota, Ted and Barney try anything to make Marshall laugh; Marshall runs into an old nemesis from high school.

When Zoey's naive cousin (Katy Perry) visits, Barney makes a move on her; Ted comes to grips with his feelings for Zoey.

Wolowitz has a meeting with Colonel Williams, a representative from the Air Force Department of Material Command.

Sheldon tries to stay awake with an energy drink as the gang races to finish its government project on time; Penny and Amy attend a gathering at Bert the Geologist's house; Koothrappali learns Bernadette's true feeling about her pregnancy.

While facing dramatic changes in his relationship with Amy, Sheldon pushes Penny and Leonard to choose a wedding date.

After her apartment floods, Amy suggests that she and Sheldon move in together; Koothrappali finds out the gender of Howard and Bernadette's baby before they do.

After her apartment floods, Amy suggests that she and Sheldon move in together; Koothrappali finds out the gender of Howard and Bernadette's baby before they do.

Darlene brings Nick to the hardware store, where they run into Ben, who invites Nick to join him at The Lunch Box to watch a Bears game; Dan tries to spruce up the bedroom while Louise is out on the road; Jackie meets Logan's mom.

Wolowitz has a meeting with Colonel Williams, a representative from the Air Force Department of Material Command.

Sheldon tries to stay awake with an energy drink as the gang races to finish its government project on time; Penny and Amy attend a gathering at Bert the Geologist's house; Koothrappali learns Bernadette's true feeling about her pregnancy.

After her apartment floods, Amy suggests that she and Sheldon move in together; Koothrappali finds out the gender of Howard and Bernadette's baby before they do.

When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores - with a little help from his friends.

Lily and Marshall receive shocking news that has a profound impact on the gang; Ted begins his duties as best man for an old friend's wedding.

Afraid they will never get pregnant, Lily and Marshall decide to see a specialist; Robin begins her new job.

While on a trip to Minnesota, Ted and Barney try anything to make Marshall laugh; Marshall runs into an old nemesis from high school.

When Zoey's naive cousin (Katy Perry) visits, Barney makes a move on her; Ted comes to grips with his feelings for Zoey.

When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores - with a little help from his friends.

While facing dramatic changes in his relationship with Amy, Sheldon pushes Penny and Leonard to choose a wedding date.

Louise starts to move into the Conners' home; Dan decides to sell the furniture set he bought for Roseanne when they were first married; Dan soon finds parting with the furniture harder than he thought it would be.

Darlene brings Nick to the hardware store, where they run into Ben, who invites Nick to join him at The Lunch Box to watch a Bears game; Dan tries to spruce up the bedroom while Louise is out on the road; Jackie meets Logan's mom.

Karen and Davis investigate a mysterious crop circle near Dog River; Oscar and Emma repaint their house.

Wanda's latest crush gives her his number; Brent questions his sense of smell; the Ruby gets a touch up.

Emma and Karen look for a suitable gift to send their twin town in Japan; Wanda attempts to become the advice giving bartender.

Oscar is asked to be a school bus driver for the day; the kids may not be the only ones who need a lesson in good behavior.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be shocked when they discover that they're contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he takes them to their destination.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be shocked when they discover that they're contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he takes them to their destination.

Karen and Davis investigate a mysterious crop circle near Dog River; Oscar and Emma repaint their house.

Wanda's latest crush gives her his number; Brent questions his sense of smell; the Ruby gets a touch up.

Emma and Karen look for a suitable gift to send their twin town in Japan; Wanda attempts to become the advice giving bartender.

Oscar is asked to be a school bus driver for the day; the kids may not be the only ones who need a lesson in good behavior.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be shocked when they discover that they're contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he takes them to their destination.

Unassuming people enter a taxi cab as simple passengers taking a normal ride, only to be shocked when they discover that they're contestants. The driver/host,Adam Grove, asks the passengers trivia questions as he takes them to their destination.

Karen and Davis investigate a mysterious crop circle near Dog River; Oscar and Emma repaint their house.

Wanda's latest crush gives her his number; Brent questions his sense of smell; the Ruby gets a touch up.

Emma and Karen look for a suitable gift to send their twin town in Japan; Wanda attempts to become the advice giving bartender.

Oscar is asked to be a school bus driver for the day; the kids may not be the only ones who need a lesson in good behavior.

The Conners celebrate Mark when he makes it on the dean's list at his new magnet school; Jackie continues to navigate her relationship with Neville.

Lily and Marshall receive shocking news that has a profound impact on the gang; Ted begins his duties as best man for an old friend's wedding.

Afraid they will never get pregnant, Lily and Marshall decide to see a specialist; Robin begins her new job.

While on a trip to Minnesota, Ted and Barney try anything to make Marshall laugh; Marshall runs into an old nemesis from high school.

When Zoey's naive cousin (Katy Perry) visits, Barney makes a move on her; Ted comes to grips with his feelings for Zoey.

Things do not run smoothly when Amy moves in with Sheldon, and Leonard and Penny have to intervene; Howard and Bernadette find unexpected guests at their house when they decide to cancel their vacation plans.

Penny learns there are fans of her performance in "Serial Ape-ist" when she and Leonard attend a Comic Con event; Amy hosts a brunch at Penny's apartment; Wolowitz makes an impulsive purchase.

Amy lies about repairs being made to her apartment so she can continue living with Sheldon; Leonard lets Penny decorate Sheldon's old room.

The Conners celebrate Mark when he makes it on the dean's list at his new magnet school; Jackie continues to navigate her relationship with Neville.

Darlene continues to navigate her breakup with Ben; Dan offers to talk with Aldo's dad when he doesn't approve of Harris and Aldo's relationship.

Barney declares Feb. 13 a holiday for desperate women; Marshall receives a Valentine's Day surprise from Lily; Zoey and Ted work on figuring out their relationship.

Marshall becomes obsessed with saving the environment after seeing a documentary on garbage; Ted runs into The Captain; Barney admits he has feelings for a woman.

Barney's growing feelings for Nora make him worry about his heart; Robyn dates a man who acts like a dog.

Barney meets his father; the gang points out things each of them should know but never learned.

Things do not run smoothly when Amy moves in with Sheldon, and Leonard and Penny have to intervene; Howard and Bernadette find unexpected guests at their house when they decide to cancel their vacation plans.

Penny learns there are fans of her performance in "Serial Ape-ist" when she and Leonard attend a Comic Con event; Amy hosts a brunch at Penny's apartment; Wolowitz makes an impulsive purchase.

Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.

Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags"; Bernadette feels bad about keeping a secret.

In light of the negative news surrounding the state of the U.S.-Mexico relationship, Conan decides to strike a positive note by hosting a show in Mexico City with an all Mexican staff, crew, guests, and audience; guests Diego Luna and Vicente Fox.

Things do not run smoothly when Amy moves in with Sheldon, and Leonard and Penny have to intervene; Howard and Bernadette find unexpected guests at their house when they decide to cancel their vacation plans.

Penny learns there are fans of her performance in "Serial Ape-ist" when she and Leonard attend a Comic Con event; Amy hosts a brunch at Penny's apartment; Wolowitz makes an impulsive purchase.

Amy lies about repairs being made to her apartment so she can continue living with Sheldon; Leonard lets Penny decorate Sheldon's old room.

Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.

Barney declares Feb. 13 a holiday for desperate women; Marshall receives a Valentine's Day surprise from Lily; Zoey and Ted work on figuring out their relationship.

Marshall becomes obsessed with saving the environment after seeing a documentary on garbage; Ted runs into The Captain; Barney admits he has feelings for a woman.

Barney's growing feelings for Nora make him worry about his heart; Robyn dates a man who acts like a dog.

Barney meets his father; the gang points out things each of them should know but never learned.

Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.

Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags"; Bernadette feels bad about keeping a secret.

The Conners celebrate Mark when he makes it on the dean's list at his new magnet school; Jackie continues to navigate her relationship with Neville.

Darlene continues to navigate her breakup with Ben; Dan offers to talk with Aldo's dad when he doesn't approve of Harris and Aldo's relationship.

Brent meets a new member of his extended family; Karen helps Wanda showcase her math skills; Ruby makes menu changes.

Oscar tries to catch a mouse; Brent and Hank invent a new game.

Lacey sets up an employee of the month program; Hank takes up a new hobby, and drives Emma crazy.

Hank believes he can run a gumball business, but Oscar lends his help and a hidden talent from Karen helps it succeed.

Brents finds a way to stop Oscar from saying the J-word, but discovers it might not have been so bad.

Hank and Davis lead the fight against a call center that might come to Dog River.

Sheldon is determined to convince Amy they should procreate; Koothrappali is reluctant to tell the gang what the new woman he's dating does for a living.

Sheldon gets jealous when a co-worker wins an award; Wolowitz finds an old remote control Stephen Hawking action figure that he made.

Sheldon and Leonard disagree about how to divide their shared belongings; Koothrappali and Stuart fight to be the most helpful to Bernadette during her final weeks of pregnancy.

While Howard and Bernadette welcome their new baby into the world, Amy celebrates her own birthday with Sheldon.

Penny thinks Leonard is taking her for granted and decides to go on a spa weekend with Amy; Wolowitz and Koothrappali try to fix a squeaky floorboard in the baby's room.

Sheldon tests an MIT invention after hearing it can help him read people's emotions; Leonard finds out Penny's brother is coming to town; Raj asks his ex-girlfriends to give him dating advice.

Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system; Raj and Stuart look after baby Halley while Penny and Amy take Bernadette for a night out.

Sheldon and Amy have their first fight since moving in together; Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.

Cut off from his father's fortune, Koothrappali appoints Sheldon to help him get out of debt; Penny considers joining Leonard at Comic-Con.

Leonard and Penny offer Sheldon's old room to Raj after he moves out of his apartment.

Leonard, Penny and Raj settle into their new living arrangement; Sheldon expresses interest in Amy's work.

Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as well as Amy on the same day; Bernadette nears the end of her maternity leave and must return to work.

Howard and Bernadette struggle to leave Halley in day care; Bert introduces the gang to his new girlfriend, Rebecca.

Leonard is less than thrilled when Penny considers accepting a job offer from Zack, her ex-boyfriend.

Sheldon is determined to convince Amy they should procreate; Koothrappali is reluctant to tell the gang what the new woman he's dating does for a living.

Sheldon gets jealous when a co-worker wins an award; Wolowitz finds an old remote control Stephen Hawking action figure that he made.

Sheldon and Leonard disagree about how to divide their shared belongings; Koothrappali and Stuart fight to be the most helpful to Bernadette during her final weeks of pregnancy.

While Howard and Bernadette welcome their new baby into the world, Amy celebrates her own birthday with Sheldon.

Penny thinks Leonard is taking her for granted and decides to go on a spa weekend with Amy; Wolowitz and Koothrappali try to fix a squeaky floorboard in the baby's room.

Sheldon tests an MIT invention after hearing it can help him read people's emotions; Leonard finds out Penny's brother is coming to town; Raj asks his ex-girlfriends to give him dating advice.

Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system; Raj and Stuart look after baby Halley while Penny and Amy take Bernadette for a night out.

Sheldon and Amy have their first fight since moving in together; Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.