Koothrappali and Leonard take Wolowitz to Las Vegas; Sheldon is forced to bunk with Penny when he gets locked out of his apartment.

Neville confronts Jackie about loaning Dan money; Darlene attempts to play matchmaker for Mark.

Penny develops a rivalry with a sexy new female neighbor who threatens her position as queen bee of the building.

Wolowitz and Leonard decide to check out a local bar on Ladies' Night.

Koothrappali and Leonard take Wolowitz to Las Vegas; Sheldon is forced to bunk with Penny when he gets locked out of his apartment.

Refinery employees balance the conflicting personalities of a small town with the antics of a stressful workplace.

Sheldon wants to search for life on other planets; Mandy answers Georgie's marriage proposal; Missy is caught between two friends.

Mandy gets an exciting job opportunity; Sheldon worries that he's falling behind; Georgie takes his daughter to work.

The gambling room gets broken into; Sheldon wants to study abroad; Missy makes a new friend.

Mandy surprises Georgie with a spa weekend; Sheldon prepares for his summer in Germany.

Refinery employees balance the conflicting personalities of a small town with the antics of a stressful workplace.

Darlene figures out a new plan to afford Mark's college tuition; Jackie and Louise try to help Becky meet a new guy.

Neville confronts Jackie about loaning Dan money; Darlene attempts to play matchmaker for Mark.

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.

The locals are confused about Wanda's PhD; Lacey gets mistaken for a cool adult by teens; Oscar finds something sinister about Davis and Karen.

Davis forgets Karen's birthday and rallies the gang to help him throw together a last-minute party with some unfortunate results; Oscar reckons with the fact that he's terrible at giving gifts.

Zach, Jaco and Grace are a group of mathematicians in the Cash Cab; a cameo appearance from Chester the Bike.

After an amusing entrance, Tim and Andrea feel it's their destiny that they managed to hail the Cash Cab.

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.

The locals are confused about Wanda's PhD; Lacey gets mistaken for a cool adult by teens; Oscar finds something sinister about Davis and Karen.

Davis forgets Karen's birthday and rallies the gang to help him throw together a last-minute party with some unfortunate results; Oscar reckons with the fact that he's terrible at giving gifts.

Zach, Jaco and Grace are a group of mathematicians in the Cash Cab; a cameo appearance from Chester the Bike.

After an amusing entrance, Tim and Andrea feel it's their destiny that they managed to hail the Cash Cab.

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.

The locals are confused about Wanda's PhD; Lacey gets mistaken for a cool adult by teens; Oscar finds something sinister about Davis and Karen.

Davis forgets Karen's birthday and rallies the gang to help him throw together a last-minute party with some unfortunate results; Oscar reckons with the fact that he's terrible at giving gifts.

As Mark's graduation approaches, he considers his relationship with his father; Louise plans a big graduation ceremony at the Lunch Box.

Sheldon wants to search for life on other planets; Mandy answers Georgie's marriage proposal; Missy is caught between two friends.

Mandy gets an exciting job opportunity; Sheldon worries that he's falling behind; Georgie takes his daughter to work.

The gambling room gets broken into; Sheldon wants to study abroad; Missy makes a new friend.

Mandy surprises Georgie with a spa weekend; Sheldon prepares for his summer in Germany.

Penny makes a surprising revelation about Leonard while on her date with Stuart; Wolowitz finds a critical design flaw in his NASA project.

While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.

After tampering with Sheldon's Arctic-expedition data, the guys follow him back to Texas, which threatens Leonard's chances for romance with Penny.

As Mark's graduation approaches, he considers his relationship with his father; Louise plans a big graduation ceremony at the Lunch Box.

A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before.

Joey stumbles upon a way to impress a famous actor (Jeff Goldblum) during an audition; Ross learns the identity of a long-ago mugger; Chandler accepts an internship at a shoe company.

Both Monica and Chandler secretly approach Joey for a loan; Phoebe invites Mike (Paul Rudd) to move in with her; Rachel baby-proofs the apartment.

Ross and Chandler trade barbed insults on their alma mater's Web site; Phoebe's resolve not to call ex-boyfriend Mike (Paul Rudd) weakens.

The gang buys scads of lottery tickets for the multimillion-dollar jackpot; Rachel suspects baby Emma is on the verge of saying her first word.

Penny makes a surprising revelation about Leonard while on her date with Stuart; Wolowitz finds a critical design flaw in his NASA project.

While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.

Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.

After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries to not ruin his new relationship with Bernadette.

After tampering with Sheldon's Arctic-expedition data, the guys follow him back to Texas, which threatens Leonard's chances for romance with Penny.

A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before.

Penny makes a surprising revelation about Leonard while on her date with Stuart; Wolowitz finds a critical design flaw in his NASA project.

While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.

After tampering with Sheldon's Arctic-expedition data, the guys follow him back to Texas, which threatens Leonard's chances for romance with Penny.

Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.

Joey stumbles upon a way to impress a famous actor (Jeff Goldblum) during an audition; Ross learns the identity of a long-ago mugger; Chandler accepts an internship at a shoe company.

Both Monica and Chandler secretly approach Joey for a loan; Phoebe invites Mike (Paul Rudd) to move in with her; Rachel baby-proofs the apartment.

Ross and Chandler trade barbed insults on their alma mater's Web site; Phoebe's resolve not to call ex-boyfriend Mike (Paul Rudd) weakens.

The gang buys scads of lottery tickets for the multimillion-dollar jackpot; Rachel suspects baby Emma is on the verge of saying her first word.

Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.

After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries to not ruin his new relationship with Bernadette.

As Mark's graduation approaches, he considers his relationship with his father; Louise plans a big graduation ceremony at the Lunch Box.

A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before.

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.

Brent gets his own private VIP section at the bar; Hank loses his keys and enlists Lacey's help to retrace his steps; Wanda attempts to retrain Davis's memory.

Davis accidentally totals the police cruiser and tries to cover it up; Hank and Wanda are tasked with making Dog River rat free; Emma struggles to get Oscar on board with spring cleaning.

Brie, Kara and Robin are three sassy girls who bop into the Cash Cab; they recognize Adam right away.

Anthony, Frank and Andrew are three buddies feeling confident in the Cash Cab; they make it to their destination.

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.

Brent gets his own private VIP section at the bar; Hank loses his keys and enlists Lacey's help to retrace his steps; Wanda attempts to retrain Davis's memory.

Davis accidentally totals the police cruiser and tries to cover it up; Hank and Wanda are tasked with making Dog River rat free; Emma struggles to get Oscar on board with spring cleaning.

Brie, Kara and Robin are three sassy girls who bop into the Cash Cab; they recognize Adam right away.

Anthony, Frank and Andrew are three buddies feeling confident in the Cash Cab; they make it to their destination.

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.

Brent gets his own private VIP section at the bar; Hank loses his keys and enlists Lacey's help to retrace his steps; Wanda attempts to retrain Davis's memory.

Davis accidentally totals the police cruiser and tries to cover it up; Hank and Wanda are tasked with making Dog River rat free; Emma struggles to get Oscar on board with spring cleaning.

Darlene gets one surprise after another when David introduces his girlfriend at a parent-teacher conference and mentions that Mark and Harris will be spending the weekend with them; Dan hires Becky to help out at work.

Joey stumbles upon a way to impress a famous actor (Jeff Goldblum) during an audition; Ross learns the identity of a long-ago mugger; Chandler accepts an internship at a shoe company.

Both Monica and Chandler secretly approach Joey for a loan; Phoebe invites Mike (Paul Rudd) to move in with her; Rachel baby-proofs the apartment.

Ross and Chandler trade barbed insults on their alma mater's Web site; Phoebe's resolve not to call ex-boyfriend Mike (Paul Rudd) weakens.

The gang buys scads of lottery tickets for the multimillion-dollar jackpot; Rachel suspects baby Emma is on the verge of saying her first word.

Penny and Leonard try to recover from an awkward hookup; Howard and Sheldon make a high-stakes bet.

Howard and Raj hit a Goth nightclub to meet women; Sheldon tries chocolate-based behavior modification on Penny.

Raj faces deportation if he does not find a job; Leonard and Penny deal with Howard as a third wheel.

Darlene gets one surprise after another when David introduces his girlfriend at a parent-teacher conference and mentions that Mark and Harris will be spending the weekend with them; Dan hires Becky to help out at work.

An email from the school banning certain Halloween costumes, including Mark's, sets off an argument between Dan and Darlene; Jackie introduces someone to the family at the Halloween party and insists that Dan vet him, but she immediately regrets it.

Rachel's visit to a soap opera set inspires her to dream about Joey; Chandler takes Ross on a weekend getaway after Monica cannot take time off from work.

Ross invites an attractive paleontologist (Aisha Tyler) to a rooftop "Days of Our Lives" party being thrown by Joey.

Monica and Chandler run into an old acquaintance when they secretly go to a fertility clinic; Ross helps Joey woo the same professor (Aisha Tyler) he wants to date.

Monica and Chandler interview unsuspecting candidates, hoping to find the right man to father their baby.

Penny and Leonard try to recover from an awkward hookup; Howard and Sheldon make a high-stakes bet.

Howard and Raj hit a Goth nightclub to meet women; Sheldon tries chocolate-based behavior modification on Penny.

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.

Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.

Raj faces deportation if he does not find a job; Leonard and Penny deal with Howard as a third wheel.

An email from the school banning certain Halloween costumes, including Mark's, sets off an argument between Dan and Darlene; Jackie introduces someone to the family at the Halloween party and insists that Dan vet him, but she immediately regrets it.

Penny and Leonard try to recover from an awkward hookup; Howard and Sheldon make a high-stakes bet.

Howard and Raj hit a Goth nightclub to meet women; Sheldon tries chocolate-based behavior modification on Penny.

Raj faces deportation if he does not find a job; Leonard and Penny deal with Howard as a third wheel.

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.

Rachel's visit to a soap opera set inspires her to dream about Joey; Chandler takes Ross on a weekend getaway after Monica cannot take time off from work.

Ross invites an attractive paleontologist (Aisha Tyler) to a rooftop "Days of Our Lives" party being thrown by Joey.

Monica and Chandler run into an old acquaintance when they secretly go to a fertility clinic; Ross helps Joey woo the same professor (Aisha Tyler) he wants to date.

Monica and Chandler interview unsuspecting candidates, hoping to find the right man to father their baby.

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.

Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.

Darlene gets one surprise after another when David introduces his girlfriend at a parent-teacher conference and mentions that Mark and Harris will be spending the weekend with them; Dan hires Becky to help out at work.

An email from the school banning certain Halloween costumes, including Mark's, sets off an argument between Dan and Darlene; Jackie introduces someone to the family at the Halloween party and insists that Dan vet him, but she immediately regrets it.

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.

Brent and Hank are disappointed to find that their favorite wrestler has become a gardener.

Lacey plans a parade for Dog River Days with all the fixings; Wanda uses a mascot to convince a corporate sponsor to support the cause; Hank battles Emma for the beauty pageant crown.

Angela, Ashley and Brian are super surprised and excited to be in the Cash Cab; they're riding high until they get stumped.

As they enter the taxi, these contestants mutter "too bad this wasn't the Cash Cab," and are completely delighted to find out where they are.

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.

Brent and Hank are disappointed to find that their favorite wrestler has become a gardener.

Lacey plans a parade for Dog River Days with all the fixings; Wanda uses a mascot to convince a corporate sponsor to support the cause; Hank battles Emma for the beauty pageant crown.

Angela, Ashley and Brian are super surprised and excited to be in the Cash Cab; they're riding high until they get stumped.

As they enter the taxi, these contestants mutter "too bad this wasn't the Cash Cab," and are completely delighted to find out where they are.

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.

Brent and Hank are disappointed to find that their favorite wrestler has become a gardener.

Lacey plans a parade for Dog River Days with all the fixings; Wanda uses a mascot to convince a corporate sponsor to support the cause; Hank battles Emma for the beauty pageant crown.

When Geena learns that D.J. hasn't been taking Mary to church, she insists they go as a family; Mark's attempt to conduct an unbiased survey on the upcoming election for his school project goes south when Jackie volunteers to help.

Rachel's visit to a soap opera set inspires her to dream about Joey; Chandler takes Ross on a weekend getaway after Monica cannot take time off from work.

Ross invites an attractive paleontologist (Aisha Tyler) to a rooftop "Days of Our Lives" party being thrown by Joey.

Monica and Chandler run into an old acquaintance when they secretly go to a fertility clinic; Ross helps Joey woo the same professor (Aisha Tyler) he wants to date.

Monica and Chandler interview unsuspecting candidates, hoping to find the right man to father their baby.

Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends.

Sheldon teaches Leonard how to understand football; a kite-fighting incident threatens Howard and Raj's friendship.

Sheldon tries to make peace when Leonard and Penny get into an argument.

When Geena learns that D.J. hasn't been taking Mary to church, she insists they go as a family; Mark's attempt to conduct an unbiased survey on the upcoming election for his school project goes south when Jackie volunteers to help.

A member of the family makes a life-changing announcement; Dan suspects Becky isn't holding up her end of the bargain with regard to her drinking; Darlene continues to look for a job; Jackie offers English lessons to a busboy.

A matchmaking company claims to have found Ted's soul mate; Lily's car breaks down en route to a secret appointment.

Ted makes a final attempt to win Robin's heart; Marshall and Lily's relationship is in jeopardy.

Newly single Lily goes to San Francisco; Ted, Barney and Robin try to cheer up unhappy Marshall.

Ted sees through Lily's stories about the fun and excitement she found in San Francisco, and Robin is surprised to learn the real reason Lily came back.

Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends.

Sheldon teaches Leonard how to understand football; a kite-fighting incident threatens Howard and Raj's friendship.

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.

Sheldon tries to make peace when Leonard and Penny get into an argument.

A member of the family makes a life-changing announcement; Dan suspects Becky isn't holding up her end of the bargain with regard to her drinking; Darlene continues to look for a job; Jackie offers English lessons to a busboy.

Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends.

Sheldon teaches Leonard how to understand football; a kite-fighting incident threatens Howard and Raj's friendship.

Sheldon tries to make peace when Leonard and Penny get into an argument.

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

A matchmaking company claims to have found Ted's soul mate; Lily's car breaks down en route to a secret appointment.

Ted makes a final attempt to win Robin's heart; Marshall and Lily's relationship is in jeopardy.

Newly single Lily goes to San Francisco; Ted, Barney and Robin try to cheer up unhappy Marshall.

Ted sees through Lily's stories about the fun and excitement she found in San Francisco, and Robin is surprised to learn the real reason Lily came back.

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.

When Geena learns that D.J. hasn't been taking Mary to church, she insists they go as a family; Mark's attempt to conduct an unbiased survey on the upcoming election for his school project goes south when Jackie volunteers to help.

A member of the family makes a life-changing announcement; Dan suspects Becky isn't holding up her end of the bargain with regard to her drinking; Darlene continues to look for a job; Jackie offers English lessons to a busboy.

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.

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 Garth, Aaron and John get in the Cash Cab, it's time for these braniacs to use their brains to get them to their destination.

Stuart and Adjoa are two love birds out on a date when they end up in the Cash Cab; they hope their love be enough to get them to their destination.

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.

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 Garth, Aaron and John get in the Cash Cab, it's time for these braniacs to use their brains to get them to their destination.

Stuart and Adjoa are two love birds out on a date when they end up in the Cash Cab; they hope their love be enough to get them to their destination.

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.

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.

Jackie convinces Dan to build a chicken coop in the backyard so the family can eat organic eggs; Becky meets with Andrea for the first time since the surrogacy mishap; Darlene deals with a sleazy customer at her casino job.

A matchmaking company claims to have found Ted's soul mate; Lily's car breaks down en route to a secret appointment.

Ted makes a final attempt to win Robin's heart; Marshall and Lily's relationship is in jeopardy.

Newly single Lily goes to San Francisco; Ted, Barney and Robin try to cheer up unhappy Marshall.

Ted sees through Lily's stories about the fun and excitement she found in San Francisco, and Robin is surprised to learn the real reason Lily came back.

Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.

After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries to not ruin his new relationship with Bernadette.

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.

Jackie convinces Dan to build a chicken coop in the backyard so the family can eat organic eggs; Becky meets with Andrea for the first time since the surrogacy mishap; Darlene deals with a sleazy customer at her casino job.

Dan questions Peter's motives when he learns about the pricey Christmas gift Jackie purchased for her new, unemployed beau; Mark and Mary write up their Christmas wish lists; Darlene receives advice from an unlikely source.

Ted's parents are visiting for the weekend, and a stunning family secret comes out during brunch.

Barney tries to show Ted that his job as an architect is a great way to pick up women.

Lily moves in with Barney; Marshall enjoys fun couple activities with another man.

Barney propositions Marshall's law professor (Jane Seymour); Lily tries to teach Ted's boss (Bryan Cranston) a lesson.

Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.

After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries to not ruin his new relationship with Bernadette.

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

When Sheldon searches for an alternative to human companionship, the guys become concerned.

Convinced by Julian's prodding, Ricky decides to get married.

Julian robs a local grocery store and the police show up at Lucy and Ricky's wedding looking for him.

Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.

After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries to not ruin his new relationship with Bernadette.

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

Ted's parents are visiting for the weekend, and a stunning family secret comes out during brunch.

Barney tries to show Ted that his job as an architect is a great way to pick up women.

Lily moves in with Barney; Marshall enjoys fun couple activities with another man.

Barney propositions Marshall's law professor (Jane Seymour); Lily tries to teach Ted's boss (Bryan Cranston) a lesson.

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

When Sheldon searches for an alternative to human companionship, the guys become concerned.

Jackie convinces Dan to build a chicken coop in the backyard so the family can eat organic eggs; Becky meets with Andrea for the first time since the surrogacy mishap; Darlene deals with a sleazy customer at her casino job.

Dan questions Peter's motives when he learns about the pricey Christmas gift Jackie purchased for her new, unemployed beau; Mark and Mary write up their Christmas wish lists; Darlene receives advice from an unlikely source.

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.

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.

Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.

After their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

Sheldon tries to figure out the answer to a physics problem by working with Penny.

Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

Sheldon ends up in traffic court after getting a ticket because of Penny.

When the guys buy a ring from "The Lord of the Rings" at a garage sale, the item threatens to tear them apart.

Sheldon's stage fright stands between him and a coveted award.

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off once again.

Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.

After their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

Sheldon tries to figure out the answer to a physics problem by working with Penny.

Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

Sheldon ends up in traffic court after getting a ticket because of Penny.

When the guys buy a ring from "The Lord of the Rings" at a garage sale, the item threatens to tear them apart.

Sheldon's stage fright stands between him and a coveted award.

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off once again.

Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.

After their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

Sheldon tries to figure out the answer to a physics problem by working with Penny.

Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

Sheldon ends up in traffic court after getting a ticket because of Penny.

When the guys buy a ring from "The Lord of the Rings" at a garage sale, the item threatens to tear them apart.

Sheldon's stage fright stands between him and a coveted award.

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off once again.

Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

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.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

In Barbados, Monica, Chandler and Phoebe eavesdrop on their friends' passionate encounters; Monica styles her hair to look like a blowfish; Phoebe and Mike rekindle their romance.

Ross drinks too much alcohol at dinner with Rachel, Joey and Charlie; Frank Jr. (Giovanni Ribisi) cannot cope with his precocious triplets.

Rachel and Joey nervously anticipate their first real date; Monica and Phoebe try to avoid an obnoxious friend (Jennifer Coolidge) with a fake British accent; Ross emerges from a tanning booth with a two-toned appearance.

Rachel gets Monica and Chandler to delay their trip to Vermont for Emma's first birthday bash.

Rachel feels like her younger sister, Amy, is finally on the verge of making a major change in her attitude; in order to help Amy become a more responsible person, Rachel overrides Ross' strong protests and allows Amy to baby-sit Emma.

When Ross interviews with Charlie's ex-boyfriend (Greg Kinnear) for a prized grant, the doctor makes a shocking stipulation; Chandler lies about watching Joey's bizarre audition tape.

Monica and Chandler fuss over their apartment as they expect a visit from the adoption worker, Laura; Phoebe and Mike opt for a small wedding and donate the extra money to a children's charity.

Monica prepares a Thanksgiving feast for the gang, then becomes enraged when everyone shows up late; Phoebe convinces Rachel to enter Emma in a baby beauty contest.

A prospective birth mother (Anna Faris) labors under a misconception about Monica and Chandler's respective occupations.

Rachel and Phoebe spot Chandler getting into a car with a mystery blonde; the friends reminisce about memorable moments.

Joey appears as a celebrity contestant on "$100,000 Pyramid"; Monica and Rachel hire an ungainly stripper (Danny DeVito) for Phoebe's bachelorette party.

A blizzard causes Phoebe and Mike's wedding to spiral out of control; uptight Monica steps in as her friend's wedding planner, then drives everyone crazy.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

In Barbados, Monica, Chandler and Phoebe eavesdrop on their friends' passionate encounters; Monica styles her hair to look like a blowfish; Phoebe and Mike rekindle their romance.

Ross drinks too much alcohol at dinner with Rachel, Joey and Charlie; Frank Jr. (Giovanni Ribisi) cannot cope with his precocious triplets.

Rachel and Joey nervously anticipate their first real date; Monica and Phoebe try to avoid an obnoxious friend (Jennifer Coolidge) with a fake British accent; Ross emerges from a tanning booth with a two-toned appearance.

Rachel gets Monica and Chandler to delay their trip to Vermont for Emma's first birthday bash.

Rachel feels like her younger sister, Amy, is finally on the verge of making a major change in her attitude; in order to help Amy become a more responsible person, Rachel overrides Ross' strong protests and allows Amy to baby-sit Emma.

When Ross interviews with Charlie's ex-boyfriend (Greg Kinnear) for a prized grant, the doctor makes a shocking stipulation; Chandler lies about watching Joey's bizarre audition tape.

Monica and Chandler fuss over their apartment as they expect a visit from the adoption worker, Laura; Phoebe and Mike opt for a small wedding and donate the extra money to a children's charity.

Monica prepares a Thanksgiving feast for the gang, then becomes enraged when everyone shows up late; Phoebe convinces Rachel to enter Emma in a baby beauty contest.

A prospective birth mother (Anna Faris) labors under a misconception about Monica and Chandler's respective occupations.

Rachel and Phoebe spot Chandler getting into a car with a mystery blonde; the friends reminisce about memorable moments.

Joey appears as a celebrity contestant on "$100,000 Pyramid"; Monica and Rachel hire an ungainly stripper (Danny DeVito) for Phoebe's bachelorette party.

A blizzard causes Phoebe and Mike's wedding to spiral out of control; uptight Monica steps in as her friend's wedding planner, then drives everyone crazy.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

In Barbados, Monica, Chandler and Phoebe eavesdrop on their friends' passionate encounters; Monica styles her hair to look like a blowfish; Phoebe and Mike rekindle their romance.

Ross drinks too much alcohol at dinner with Rachel, Joey and Charlie; Frank Jr. (Giovanni Ribisi) cannot cope with his precocious triplets.

Rachel and Joey nervously anticipate their first real date; Monica and Phoebe try to avoid an obnoxious friend (Jennifer Coolidge) with a fake British accent; Ross emerges from a tanning booth with a two-toned appearance.

Rachel gets Monica and Chandler to delay their trip to Vermont for Emma's first birthday bash.

Rachel feels like her younger sister, Amy, is finally on the verge of making a major change in her attitude; in order to help Amy become a more responsible person, Rachel overrides Ross' strong protests and allows Amy to baby-sit Emma.

When Ross interviews with Charlie's ex-boyfriend (Greg Kinnear) for a prized grant, the doctor makes a shocking stipulation; Chandler lies about watching Joey's bizarre audition tape.

Monica and Chandler fuss over their apartment as they expect a visit from the adoption worker, Laura; Phoebe and Mike opt for a small wedding and donate the extra money to a children's charity.

Monica prepares a Thanksgiving feast for the gang, then becomes enraged when everyone shows up late; Phoebe convinces Rachel to enter Emma in a baby beauty contest.

A prospective birth mother (Anna Faris) labors under a misconception about Monica and Chandler's respective occupations.

Rachel and Phoebe spot Chandler getting into a car with a mystery blonde; the friends reminisce about memorable moments.

Joey appears as a celebrity contestant on "$100,000 Pyramid"; Monica and Rachel hire an ungainly stripper (Danny DeVito) for Phoebe's bachelorette party.

A blizzard causes Phoebe and Mike's wedding to spiral out of control; uptight Monica steps in as her friend's wedding planner, then drives everyone crazy.

Lacey is suspicious of the illegal duplication of Dog River money; Hank gets a case of pink eye, causing Brent and Wanda to panic in Corner Gas; Karen is frustrated with Davis.

Emma goes Christmas shopping early making everyone curious to find out what they are getting.

Brent accidentally locks Hank and Wanda in Corner Gas; Emma tries to get out of making Davis's special bread.

Davis tries to get Brent to join his rugby team; Brent's more focused on inventing a new rugby chant; Hank and Karen convince Lacey to start selling pizza in the Ruby.

This gang is stoked and full of confidence when they find out that they have entered the Cash Cab.

Martin and Karl are super pumped to be in the Cash Cab, but their street shout out lets them down.

Lacey is suspicious of the illegal duplication of Dog River money; Hank gets a case of pink eye, causing Brent and Wanda to panic in Corner Gas; Karen is frustrated with Davis.

Emma goes Christmas shopping early making everyone curious to find out what they are getting.

Brent accidentally locks Hank and Wanda in Corner Gas; Emma tries to get out of making Davis's special bread.

Davis tries to get Brent to join his rugby team; Brent's more focused on inventing a new rugby chant; Hank and Karen convince Lacey to start selling pizza in the Ruby.

This gang is stoked and full of confidence when they find out that they have entered the Cash Cab.

Martin and Karl are super pumped to be in the Cash Cab, but their street shout out lets them down.

Lacey is suspicious of the illegal duplication of Dog River money; Hank gets a case of pink eye, causing Brent and Wanda to panic in Corner Gas; Karen is frustrated with Davis.

Emma goes Christmas shopping early making everyone curious to find out what they are getting.

Brent accidentally locks Hank and Wanda in Corner Gas; Emma tries to get out of making Davis's special bread.

Davis tries to get Brent to join his rugby team; Brent's more focused on inventing a new rugby chant; Hank and Karen convince Lacey to start selling pizza in the Ruby.

Becky helps Harris keep a secret from Darlene, which causes a rift between the sisters; Jackie supports Peter with his project; Dan and an old friend reunite.

There's no sound, but there sure are plenty of laughs. This crazy Quebec-based troupe uses the city as its stage, and its inhabitants, or victims, as characters! People are caught in a twisted yet funny web of comedic deception. This updated "Candid Camera" is a tad more risque and a little kookier with its practical jokes. The little snippets last only a few minutes, and some look more painful than others.

There's no sound, but there sure are plenty of laughs. This crazy Quebec-based troupe uses the city as its stage, and its inhabitants, or victims, as characters! People are caught in a twisted yet funny web of comedic deception. This updated "Candid Camera" is a tad more risque and a little kookier with its practical jokes. The little snippets last only a few minutes, and some look more painful than others.

There's no sound, but there sure are plenty of laughs. This crazy Quebec-based troupe uses the city as its stage, and its inhabitants, or victims, as characters! People are caught in a twisted yet funny web of comedic deception. This updated "Candid Camera" is a tad more risque and a little kookier with its practical jokes. The little snippets last only a few minutes, and some look more painful than others.

There's no sound, but there sure are plenty of laughs. This crazy Quebec-based troupe uses the city as its stage, and its inhabitants, or victims, as characters! People are caught in a twisted yet funny web of comedic deception. This updated "Candid Camera" is a tad more risque and a little kookier with its practical jokes. The little snippets last only a few minutes, and some look more painful than others.

When Sheldon searches for an alternative to human companionship, the guys become concerned.

An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.

Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.

Becky helps Harris keep a secret from Darlene, which causes a rift between the sisters; Jackie supports Peter with his project; Dan and an old friend reunite.

When Dan gets injured while covering D.J.'s vending machine route, the decision to sue the company could cost D.J. his job; Jackie is appalled when Becky seeks life coaching from her nemesis.

Sheldon and Mary head to Germany while the rest of the Cooper family braves a tornado that is heading straight for Medford.

News of the tornado reaches Sheldon and Mary in Germany; with the Cooper house in chaos, Missy steps up.

Sheldon realizes he is the weakest student in his class; Meemaw looks to expand her gambling business.

Sheldon explores Germany behind Mary's back; Missy attempts to pull a fast one on George Sr.; Meemaw and Dale adjust to living together.

When Sheldon searches for an alternative to human companionship, the guys become concerned.

An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.

An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.

Refinery employees balance the conflicting personalities of a small town with the antics of a stressful workplace.

Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.

When Dan gets injured while covering D.J.'s vending machine route, the decision to sue the company could cost D.J. his job; Jackie is appalled when Becky seeks life coaching from her nemesis.

When Sheldon searches for an alternative to human companionship, the guys become concerned.

An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.

Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.

Refinery employees balance the conflicting personalities of a small town with the antics of a stressful workplace.

Sheldon and Mary head to Germany while the rest of the Cooper family braves a tornado that is heading straight for Medford.

News of the tornado reaches Sheldon and Mary in Germany; with the Cooper house in chaos, Missy steps up.

Sheldon realizes he is the weakest student in his class; Meemaw looks to expand her gambling business.

Sheldon explores Germany behind Mary's back; Missy attempts to pull a fast one on George Sr.; Meemaw and Dale adjust to living together.

Refinery employees balance the conflicting personalities of a small town with the antics of a stressful workplace.

Becky helps Harris keep a secret from Darlene, which causes a rift between the sisters; Jackie supports Peter with his project; Dan and an old friend reunite.

When Dan gets injured while covering D.J.'s vending machine route, the decision to sue the company could cost D.J. his job; Jackie is appalled when Becky seeks life coaching from her nemesis.

Karen and Davis figure out a way to get Emma to do free cleaning.

Oscar and Emma discover an easy way to make some fast money; Davis decides to take off with Brent's car.

The band Thunderface reunites; a song Brent wrote back in high school has Lacey investigating his mystery crush; Oscar shoots a fundraising video for the Seniors' Center.

Wanda repairs junk to re-sell at the community yard sale; Oscar, Emma, and Davis become obsessed with Karen's high-end beauty serums.

This rowdy gang of four take a big gamble in the Cash Cab; they are full of enthusiasm and have some great answers.

Alec, Ann and Jacqueline are bemused by the Cash Cab, but decide to give it a go; it's a tense ride.

Karen and Davis figure out a way to get Emma to do free cleaning.

Oscar and Emma discover an easy way to make some fast money; Davis decides to take off with Brent's car.

The band Thunderface reunites; a song Brent wrote back in high school has Lacey investigating his mystery crush; Oscar shoots a fundraising video for the Seniors' Center.

Wanda repairs junk to re-sell at the community yard sale; Oscar, Emma, and Davis become obsessed with Karen's high-end beauty serums.

This rowdy gang of four take a big gamble in the Cash Cab; they are full of enthusiasm and have some great answers.

Alec, Ann and Jacqueline are bemused by the Cash Cab, but decide to give it a go; it's a tense ride.

Karen and Davis figure out a way to get Emma to do free cleaning.

Oscar and Emma discover an easy way to make some fast money; Davis decides to take off with Brent's car.

The band Thunderface reunites; a song Brent wrote back in high school has Lacey investigating his mystery crush; Oscar shoots a fundraising video for the Seniors' Center.

Wanda repairs junk to re-sell at the community yard sale; Oscar, Emma, and Davis become obsessed with Karen's high-end beauty serums.

When Ben offers Mark free piano lessons, Darlene uses it as an opportunity to test his parenting skills; Jackie throws Becky a baby shower; Emilio continues his efforts to be part of the baby's life.

Sheldon and Mary head to Germany while the rest of the Cooper family braves a tornado that is heading straight for Medford.

News of the tornado reaches Sheldon and Mary in Germany; with the Cooper house in chaos, Missy steps up.

Sheldon realizes he is the weakest student in his class; Meemaw looks to expand her gambling business.

Sheldon explores Germany behind Mary's back; Missy attempts to pull a fast one on George Sr.; Meemaw and Dale adjust to living together.

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

When Ben offers Mark free piano lessons, Darlene uses it as an opportunity to test his parenting skills; Jackie throws Becky a baby shower; Emilio continues his efforts to be part of the baby's life.

As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down; relationship problems lead Jackie to the bottom of the bottle; Dan delivers alarming news.

Monica and Chandler show Erica the tourist sights; they learn their baby's biological father might be an unsavory character; Joey begs Phoebe to teach him how to speak French before an audition.

Rachel goes to a job interview at a restaurant and winds up sitting next to her current boss; Joey feels abandoned because Monica and Chandler are leaving.

Ross tries to win back Rachel's job with her former fashion employer; Phoebe tries to keep Joey from learning about his agent's death; Monica and Chandler make a horrifying discovery.

One of the guys becomes offended when Rachel does not give him the same goodbye she gives the others.

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down; relationship problems lead Jackie to the bottom of the bottle; Dan delivers alarming news.

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.

Monica and Chandler show Erica the tourist sights; they learn their baby's biological father might be an unsavory character; Joey begs Phoebe to teach him how to speak French before an audition.

Rachel goes to a job interview at a restaurant and winds up sitting next to her current boss; Joey feels abandoned because Monica and Chandler are leaving.

Ross tries to win back Rachel's job with her former fashion employer; Phoebe tries to keep Joey from learning about his agent's death; Monica and Chandler make a horrifying discovery.

One of the guys becomes offended when Rachel does not give him the same goodbye she gives the others.

Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

When Ben offers Mark free piano lessons, Darlene uses it as an opportunity to test his parenting skills; Jackie throws Becky a baby shower; Emilio continues his efforts to be part of the baby's life.

As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down; relationship problems lead Jackie to the bottom of the bottle; Dan delivers alarming news.

Lacey gets invited to join the Dog River Women's Club, but soon realises that it isn't right for her.

It's the eve of Brent's 40th birthday; to celebrate, the town has planned a midnight party complete with fireworks and a parade.

The Corner Gas parking lot becomes a drive-in; Hank puts Davis and Karen on high alert for potential criminal behavior; Oscar and Emma take advantage, reliving their youthful friskiness; Lacey touches a nerve of Brent's.

Brent and Wanda help Lacey overcome her fears so she can go skydiving; Hank becomes the town messenger; Oscar and Emma go to war with Karen and Davis over a prime potato planting locale.

Sam, David, Yuri and Pierre are four dudes out for a night on the town, and when they get into Adam's cab, their partying doesn't stop.

These girls catch the cab on a rainy night and are delighted to find out they are in the Cash Cab.

Lacey gets invited to join the Dog River Women's Club, but soon realises that it isn't right for her.

It's the eve of Brent's 40th birthday; to celebrate, the town has planned a midnight party complete with fireworks and a parade.

The Corner Gas parking lot becomes a drive-in; Hank puts Davis and Karen on high alert for potential criminal behavior; Oscar and Emma take advantage, reliving their youthful friskiness; Lacey touches a nerve of Brent's.

Brent and Wanda help Lacey overcome her fears so she can go skydiving; Hank becomes the town messenger; Oscar and Emma go to war with Karen and Davis over a prime potato planting locale.

Sam, David, Yuri and Pierre are four dudes out for a night on the town, and when they get into Adam's cab, their partying doesn't stop.

These girls catch the cab on a rainy night and are delighted to find out they are in the Cash Cab.

Lacey gets invited to join the Dog River Women's Club, but soon realises that it isn't right for her.

It's the eve of Brent's 40th birthday; to celebrate, the town has planned a midnight party complete with fireworks and a parade.

The Corner Gas parking lot becomes a drive-in; Hank puts Davis and Karen on high alert for potential criminal behavior; Oscar and Emma take advantage, reliving their youthful friskiness; Lacey touches a nerve of Brent's.

Brent and Wanda help Lacey overcome her fears so she can go skydiving; Hank becomes the town messenger; Oscar and Emma go to war with Karen and Davis over a prime potato planting locale.

In the wake of Emilio's deportation, Jackie steps into the role of a paternal figure and creates a meticulous birth plan for Becky; Darlene is tangled in a complex love triangle with David and Ben; Harris is caught up in a problem of her own.

Monica and Chandler show Erica the tourist sights; they learn their baby's biological father might be an unsavory character; Joey begs Phoebe to teach him how to speak French before an audition.

Rachel goes to a job interview at a restaurant and winds up sitting next to her current boss; Joey feels abandoned because Monica and Chandler are leaving.

Ross tries to win back Rachel's job with her former fashion employer; Phoebe tries to keep Joey from learning about his agent's death; Monica and Chandler make a horrifying discovery.

One of the guys becomes offended when Rachel does not give him the same goodbye she gives the others.

Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.

Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.

The guys try to bond with Penny's new boyfriend through a costume contest.

In the wake of Emilio's deportation, Jackie steps into the role of a paternal figure and creates a meticulous birth plan for Becky; Darlene is tangled in a complex love triangle with David and Ben; Harris is caught up in a problem of her own.

Darlene struggles to decide between David and Ben; Becky begins to doubt herself as a mom; Mark gets in trouble at school when a picture of him and his boyfriend kissing goes viral; Jackie avoids her problems by keeping busy with everyone else's.

The six friends prepare to say goodbye and embark on the next chapters of their lives; momentous events and last-minute surprises.

The six friends prepare to say goodbye and embark on the next chapters of their lives; momentous events and last-minute surprises.

Monica's high-school friend visits after leaving her fiance at the altar.

Monica begins to feel the heat when she prepares dinner for her parents (Elliott Gould, Christina Pickles).

Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.

Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

The guys try to bond with Penny's new boyfriend through a costume contest.

Darlene struggles to decide between David and Ben; Becky begins to doubt herself as a mom; Mark gets in trouble at school when a picture of him and his boyfriend kissing goes viral; Jackie avoids her problems by keeping busy with everyone else's.

Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.

Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.

The guys try to bond with Penny's new boyfriend through a costume contest.

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

The six friends prepare to say goodbye and embark on the next chapters of their lives; momentous events and last-minute surprises.

The six friends prepare to say goodbye and embark on the next chapters of their lives; momentous events and last-minute surprises.

Monica's high-school friend visits after leaving her fiance at the altar.

Monica begins to feel the heat when she prepares dinner for her parents (Elliott Gould, Christina Pickles).

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

In the wake of Emilio's deportation, Jackie steps into the role of a paternal figure and creates a meticulous birth plan for Becky; Darlene is tangled in a complex love triangle with David and Ben; Harris is caught up in a problem of her own.

Darlene struggles to decide between David and Ben; Becky begins to doubt herself as a mom; Mark gets in trouble at school when a picture of him and his boyfriend kissing goes viral; Jackie avoids her problems by keeping busy with everyone else's.

Lacey is the unlikely champion of an eating contest; Emma enjoys the pleasures of an MP3 player.

Brent and Lacey sponsor Davis' football team; Karen's reckless driving puts Hank in the driver's seat.

Wanda, Lacey, and Karen team up to fix The Ruby's broken toaster; Emma and Oscar have an impression-off; Davis is excited when he discovers Hank owns a valuable action figure.

Oscar's convinced there's a venomous cobra in his backyard; Hank discovers an intriguing bird's nest and sets up a livestream so everyone in town can watch the eggs hatch.

Sabrina, Samira and Mai are initially weirded out by the Cash Cab, but once they understand the rules, these three babes quickly prove they are more than just pretty faces.

London, Steve, Antonio and Foster end up in the Cash Cab.

Lacey is the unlikely champion of an eating contest; Emma enjoys the pleasures of an MP3 player.

Brent and Lacey sponsor Davis' football team; Karen's reckless driving puts Hank in the driver's seat.

Wanda, Lacey, and Karen team up to fix The Ruby's broken toaster; Emma and Oscar have an impression-off; Davis is excited when he discovers Hank owns a valuable action figure.

Oscar's convinced there's a venomous cobra in his backyard; Hank discovers an intriguing bird's nest and sets up a livestream so everyone in town can watch the eggs hatch.

Sabrina, Samira and Mai are initially weirded out by the Cash Cab, but once they understand the rules, these three babes quickly prove they are more than just pretty faces.

London, Steve, Antonio and Foster end up in the Cash Cab.

Lacey is the unlikely champion of an eating contest; Emma enjoys the pleasures of an MP3 player.

Brent and Lacey sponsor Davis' football team; Karen's reckless driving puts Hank in the driver's seat.

Wanda, Lacey, and Karen team up to fix The Ruby's broken toaster; Emma and Oscar have an impression-off; Davis is excited when he discovers Hank owns a valuable action figure.

Oscar's convinced there's a venomous cobra in his backyard; Hank discovers an intriguing bird's nest and sets up a livestream so everyone in town can watch the eggs hatch.

Harris is forced to confront Darlene about her lifestyle; Jackie involves herself in other people's problems to avoid confronting her own; Becky is overwhelmed by the costs of raising a baby, so her family steps in to help.

The six friends prepare to say goodbye and embark on the next chapters of their lives; momentous events and last-minute surprises.

The six friends prepare to say goodbye and embark on the next chapters of their lives; momentous events and last-minute surprises.

Monica's high-school friend visits after leaving her fiance at the altar.

Monica begins to feel the heat when she prepares dinner for her parents (Elliott Gould, Christina Pickles).

Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.

Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.

Sheldon takes acting lessons from Penny in hope of becoming a better teacher; Koothrappali fantasizes about his friend's girlfriend.

Harris is forced to confront Darlene about her lifestyle; Jackie involves herself in other people's problems to avoid confronting her own; Becky is overwhelmed by the costs of raising a baby, so her family steps in to help.

Desperate for more income, Becky seeks a bartending position at Casita Bonita, causing major concern for Dan due to her struggle with alcoholism; Darlene finally nears a decision between David and Ben; Harris' new friend, Odessa, means new trouble.

Ted and Barney try to convince Marshall his new girlfriend is crazy.

Marshall and Lily go to Atlantic city to elope, but are held up by the three-day wait for a license.