Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable investment; a seven-year-old video reveals a secret about Leonard and Penny's relationship.

Ted wonders if he should tell Robin that Barney plans to propose to Patrice; Lily and Marshall run into an acquaintance from college.

Robin insists that Barney ask her dad for permission to marry her; Ted tries to bury his feelings by throwing himself into wedding planning.

Barney asks Ted to keep dating Carly (Ashley Benson), a much younger woman, even though she and Ted have nothing in common.

Barney finds an episode of Robin's "Underneath the Tunes" as Robin Sparkles; Lily and Marshall fear that Ted's new girlfriend is a stalker.

Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable investment; a seven-year-old video reveals a secret about Leonard and Penny's relationship.

Sheldon and Amy try to use math to eliminate wedding planning stress; Koothrappali "breaks up" with Wolowitz after realizing he is hurting his confidence.

Harris is newly unemployed, depressed and has moved back into the house, while Becky struggles to find affordable childcare; Jackie suggests Becky reach out to Emilio's family for support; the family contemplates tattoos.

Bev is back from Arizona and realizes she'd like to use her finances to spread happiness; Bev decides to fund Mark's tuition to a prestigious coding camp, but Darlene tries to convince her to give the money to Harris instead.

Brent agrees to baby-sit Wanda's troubled 6-year old son, Tanner, to impress Lacey.

Rookie cop Karen makes it her mission to find out who spray-painted "Grad 68" on the water tower.

Dog River decides to put up a giant landmark; Oscar struggles to stop a love-struck admirer from ruining his marriage.

When Lacey's ex-fiance from Toronto comes to visit, the people of Dog River take matters into their own hands to protect her from her past.

In this battle of the sexes game, the ladies maybe sitting in the back, but they are the front of centre when it comes to answering questions right!

Two brothers try to impress their gorgeous friend with their cash cab wits; but it's possible it will be Marcia who will be the impressive one, all the way to their destination.

Brent agrees to baby-sit Wanda's troubled 6-year old son, Tanner, to impress Lacey.

Rookie cop Karen makes it her mission to find out who spray-painted "Grad 68" on the water tower.

Dog River decides to put up a giant landmark; Oscar struggles to stop a love-struck admirer from ruining his marriage.

When Lacey's ex-fiance from Toronto comes to visit, the people of Dog River take matters into their own hands to protect her from her past.

In this battle of the sexes game, the ladies maybe sitting in the back, but they are the front of centre when it comes to answering questions right!

Two brothers try to impress their gorgeous friend with their cash cab wits; but it's possible it will be Marcia who will be the impressive one, all the way to their destination.

Brent agrees to baby-sit Wanda's troubled 6-year old son, Tanner, to impress Lacey.

Rookie cop Karen makes it her mission to find out who spray-painted "Grad 68" on the water tower.

Dog River decides to put up a giant landmark; Oscar struggles to stop a love-struck admirer from ruining his marriage.

When Lacey's ex-fiance from Toronto comes to visit, the people of Dog River take matters into their own hands to protect her from her past.

Dan is finally ready to share his feelings with Louise; Darlene realizes how badly she wants a baby; Ben gets caught up playing handyman and babysitter for Becky, which causes him to miss an important meeting.

Ted wonders if he should tell Robin that Barney plans to propose to Patrice; Lily and Marshall run into an acquaintance from college.

Robin insists that Barney ask her dad for permission to marry her; Ted tries to bury his feelings by throwing himself into wedding planning.

Barney asks Ted to keep dating Carly (Ashley Benson), a much younger woman, even though she and Ted have nothing in common.

Barney finds an episode of Robin's "Underneath the Tunes" as Robin Sparkles; Lily and Marshall fear that Ted's new girlfriend is a stalker.

Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard says something in the bedroom that surprises Penny.

The gang tries to help Wolowitz and Bernadette get married before the space launch.

Raj faces his loneliness when his friends are out on dates; while in space, Wolowitz gets drawn into a fight between Bernadette and his mom.

Dan is finally ready to share his feelings with Louise; Darlene realizes how badly she wants a baby; Ben gets caught up playing handyman and babysitter for Becky, which causes him to miss an important meeting.

Dan and Louise take their relationship to the next level and come to appreciate the complexities of aging; Darlene spends the night in jail and leaves parenting duties to Ben; Mark and a friend's class experiment leaves them both with hickeys.

Ted is reluctant to break things off with his unstable girlfriend (Abby Elliot); Robin holds Marvin for the first time.

When the Captain (Kyle MacLachlan) calls Ted unexpectedly, the gang remembers their last awkward encounter.

After Ted and Jeanette break up, Barney uses his infamous playbook to Ted find a new date; Lily tries to make a good impression at a gallery opening.

Robin wants Barney to sell his bachelor pad, but Barney is hesitant and drives potential buyers away; Lily's job as the Captain's art consultant strains her relationship with Marshall.

Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard says something in the bedroom that surprises Penny.

The gang tries to help Wolowitz and Bernadette get married before the space launch.

Sheldon plans an authentic "Little House on the Prairie" dinner for Amy's birthday; Leonard receives a Christmas letter from his brother.

Sheldon and Amy subject their friends to a series of secret experiments to discover which two would be most qualified to be the best man and the maid of honor at their wedding; Penny reveals her true feelings about Amy.

After President Trump's remarks about purchasing Greenland, Conan O'Brien takes the show overseas for the 12th time to help broker the deal.

Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard says something in the bedroom that surprises Penny.

The gang tries to help Wolowitz and Bernadette get married before the space launch.

Raj faces his loneliness when his friends are out on dates; while in space, Wolowitz gets drawn into a fight between Bernadette and his mom.

Sheldon plans an authentic "Little House on the Prairie" dinner for Amy's birthday; Leonard receives a Christmas letter from his brother.

Ted is reluctant to break things off with his unstable girlfriend (Abby Elliot); Robin holds Marvin for the first time.

When the Captain (Kyle MacLachlan) calls Ted unexpectedly, the gang remembers their last awkward encounter.

After Ted and Jeanette break up, Barney uses his infamous playbook to Ted find a new date; Lily tries to make a good impression at a gallery opening.

Robin wants Barney to sell his bachelor pad, but Barney is hesitant and drives potential buyers away; Lily's job as the Captain's art consultant strains her relationship with Marshall.

Sheldon plans an authentic "Little House on the Prairie" dinner for Amy's birthday; Leonard receives a Christmas letter from his brother.

Sheldon and Amy subject their friends to a series of secret experiments to discover which two would be most qualified to be the best man and the maid of honor at their wedding; Penny reveals her true feelings about Amy.

Dan is finally ready to share his feelings with Louise; Darlene realizes how badly she wants a baby; Ben gets caught up playing handyman and babysitter for Becky, which causes him to miss an important meeting.

Dan and Louise take their relationship to the next level and come to appreciate the complexities of aging; Darlene spends the night in jail and leaves parenting duties to Ben; Mark and a friend's class experiment leaves them both with hickeys.

Dog River prepares for its annual talent show; Brent's cousin Carl, whom everyone seems to love, except Brent, comes for a visit.

Davis tries to keep up with Brent; Lacey tries to prove she has community spirit by trying to save one of the town's historic landmarks.

Brent develops a grudge for an out-of-town comedian who performs at a comedy night in Dog River; Hank is star-struck by the guy and arranges to be the M.C. for the night.

Brent puts a sign with slogans in front of the gas station and coffee shop; Brent and Emma worry about Oscar's memory.

The Dog River hockey team finds itself at a crossroads; Brent is a great goalie and is being taken for granted by his teammates; when an offer from a rival team comes his way, he has a decision to make.

On the way to the Grey Cup, Brent considers his real feelings for Lacey.

Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard; Howard is picked on.

Amy feels threatened by Sheldon's new assistant; Wolowitz starts to feel the pressures of being in space.

Wolowitz's return from space isn't all he expected; game night becomes a gender war.

The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.

A game threatens Sheldon's relationship with Stephen Hawking; Penny secretly signs up for a college class.

Bernadette wants Wolowitz to move out of his mom's house; Sheldon is caught in the middle of Amy and Wil Wheaton's argument.

Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.

Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.

When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.

When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Wolowitz in trouble.

As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.

The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.

Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard; Howard is picked on.

Amy feels threatened by Sheldon's new assistant; Wolowitz starts to feel the pressures of being in space.

Wolowitz's return from space isn't all he expected; game night becomes a gender war.

The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.

A game threatens Sheldon's relationship with Stephen Hawking; Penny secretly signs up for a college class.

Bernadette wants Wolowitz to move out of his mom's house; Sheldon is caught in the middle of Amy and Wil Wheaton's argument.

Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.

Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.

When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.

When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Wolowitz in trouble.

As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.

The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.

Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard; Howard is picked on.

Amy feels threatened by Sheldon's new assistant; Wolowitz starts to feel the pressures of being in space.

Wolowitz's return from space isn't all he expected; game night becomes a gender war.

The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.

A game threatens Sheldon's relationship with Stephen Hawking; Penny secretly signs up for a college class.

Bernadette wants Wolowitz to move out of his mom's house; Sheldon is caught in the middle of Amy and Wil Wheaton's argument.

Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.

Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.

When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.

When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Wolowitz in trouble.

As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.

The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.

Brent and Lacey try to figure out their relationship; Emma's on the warpath.

Brent finds out his parents never married; Lacey's mission to help Oscar.

Davis regains sense of smell; Brent realizes how little he knows about his friends.

Oscar asks for Karen's help in getting culinary revenge against Emma.

Karen drives everyone crazy with her new hacky-sack; Oscar finds a pair of pants.

Brent buys a big-screen television; Lacey buys jewelry from Wanda.

Phoebe reunites with her former singing partner (E.G. Daily); Chandler dates a woman (Sherilyn Fenn) who has a prosthetic limb.

Phoebe has trouble communicating with her new boyfriend; Ross seeks solace at a party after a bitter fight with Rachel.

Ross tries to prevent Rachel from learning his disturbing secret; Monica, Phoebe, Chandler and Joey spend a night eavesdropping.

Excluded from Rachel's ski trip with her pals, lonely Ross visits his ex-wife (Jane Sibbett); Phoebe's cab runs out of gas and the stranded gang turns to Ross for help.

Desperate, Monica agrees to a date with one of her restaurant customers; Phoebe's younger brother visits.

Rachel goes on her first date after splitting with Ross; Joey's new flame doesn't seem interested in him.

Rachel regrets making a date for Chandler and her boss, Joanna (Alison LaPlaca); Joey's interest in Kate (Dina Meyer) intensifies.

Monica considers accepting a dream job in Pete's (Jon Favreau) new restaurant but fears there is more to the deal.

The gang goes to the opening night of Joey's plays; Rachel brings a date (Ben Stiller) to make Ross jealous; Joey's play gets terrible reviews, but his co-star provides some comfort.

Afflicted with a mysterious skin condition, Ross seeks advice from Guru Saj; Monica can't decide about Pete.

To her horror, Monica's boyfriend plans to fight; the friends are intrigued by a conversation between two strangers.

The gang spends a weekend at a beach house; in search of her father, Phoebe meets a family friend (Teri Garr) with links to her family's past.

Ross is dating Rachel again but hates what he had to do to get her back; Phoebe and her birth mother (Teri Garr) reconnect; Monica is stung by a jellyfish and has to resort to drastic measures to relieve the pain.

Phoebe finds meaning in the appearance of a stray cat; Joey and Chandler agree to sell some furniture.

Phoebe reunites with her former singing partner (E.G. Daily); Chandler dates a woman (Sherilyn Fenn) who has a prosthetic limb.

Phoebe has trouble communicating with her new boyfriend; Ross seeks solace at a party after a bitter fight with Rachel.

Ross tries to prevent Rachel from learning his disturbing secret; Monica, Phoebe, Chandler and Joey spend a night eavesdropping.

Excluded from Rachel's ski trip with her pals, lonely Ross visits his ex-wife (Jane Sibbett); Phoebe's cab runs out of gas and the stranded gang turns to Ross for help.

Desperate, Monica agrees to a date with one of her restaurant customers; Phoebe's younger brother visits.

Rachel goes on her first date after splitting with Ross; Joey's new flame doesn't seem interested in him.

Rachel regrets making a date for Chandler and her boss, Joanna (Alison LaPlaca); Joey's interest in Kate (Dina Meyer) intensifies.

Monica considers accepting a dream job in Pete's (Jon Favreau) new restaurant but fears there is more to the deal.

The gang goes to the opening night of Joey's plays; Rachel brings a date (Ben Stiller) to make Ross jealous; Joey's play gets terrible reviews, but his co-star provides some comfort.

Afflicted with a mysterious skin condition, Ross seeks advice from Guru Saj; Monica can't decide about Pete.

To her horror, Monica's boyfriend plans to fight; the friends are intrigued by a conversation between two strangers.

The gang spends a weekend at a beach house; in search of her father, Phoebe meets a family friend (Teri Garr) with links to her family's past.

Ross is dating Rachel again but hates what he had to do to get her back; Phoebe and her birth mother (Teri Garr) reconnect; Monica is stung by a jellyfish and has to resort to drastic measures to relieve the pain.

Phoebe finds meaning in the appearance of a stray cat; Joey and Chandler agree to sell some furniture.

Phoebe reunites with her former singing partner (E.G. Daily); Chandler dates a woman (Sherilyn Fenn) who has a prosthetic limb.

Phoebe has trouble communicating with her new boyfriend; Ross seeks solace at a party after a bitter fight with Rachel.

Ross tries to prevent Rachel from learning his disturbing secret; Monica, Phoebe, Chandler and Joey spend a night eavesdropping.

Excluded from Rachel's ski trip with her pals, lonely Ross visits his ex-wife (Jane Sibbett); Phoebe's cab runs out of gas and the stranded gang turns to Ross for help.

Desperate, Monica agrees to a date with one of her restaurant customers; Phoebe's younger brother visits.

Rachel goes on her first date after splitting with Ross; Joey's new flame doesn't seem interested in him.

Rachel regrets making a date for Chandler and her boss, Joanna (Alison LaPlaca); Joey's interest in Kate (Dina Meyer) intensifies.

Monica considers accepting a dream job in Pete's (Jon Favreau) new restaurant but fears there is more to the deal.

The gang goes to the opening night of Joey's plays; Rachel brings a date (Ben Stiller) to make Ross jealous; Joey's play gets terrible reviews, but his co-star provides some comfort.

Afflicted with a mysterious skin condition, Ross seeks advice from Guru Saj; Monica can't decide about Pete.

To her horror, Monica's boyfriend plans to fight; the friends are intrigued by a conversation between two strangers.

The gang spends a weekend at a beach house; in search of her father, Phoebe meets a family friend (Teri Garr) with links to her family's past.

Ross is dating Rachel again but hates what he had to do to get her back; Phoebe and her birth mother (Teri Garr) reconnect; Monica is stung by a jellyfish and has to resort to drastic measures to relieve the pain.

Phoebe finds meaning in the appearance of a stray cat; Joey and Chandler agree to sell some furniture.

Wanda's excited about getting a tattoo; police crack down on jaywalkers.

Brent installs a security camera at Corner Gas; Davis gets a stun gun.

Wanda goes power mad; Davis and Karen make a dangerous bet; Oscar recalls "the incident" that made him give up the game for good; Brent and Hank are lost in the woods.

Wanda creates her dream video game; Lacey and Karen offer to help Davis release his pent-up stress; Oscar and Emma break out the crokinole board.

Four young guys get into the Cash Cab and announce their collective brain will win the game; after cruising through the Red Light Challenge with flying colours, things take a turn for the worst and they must ask for help from a beautiful woman.

When four guys hail a cab after dinner at a trendy Eglinton pub, the last thing they expect is to end up on a quiz show; once they're in the cash cab, the last thing this bunch expects is to be kicked out.

Wanda's excited about getting a tattoo; police crack down on jaywalkers.

Brent installs a security camera at Corner Gas; Davis gets a stun gun.

Wanda goes power mad; Davis and Karen make a dangerous bet; Oscar recalls "the incident" that made him give up the game for good; Brent and Hank are lost in the woods.

Wanda creates her dream video game; Lacey and Karen offer to help Davis release his pent-up stress; Oscar and Emma break out the crokinole board.

Four young guys get into the Cash Cab and announce their collective brain will win the game; after cruising through the Red Light Challenge with flying colours, things take a turn for the worst and they must ask for help from a beautiful woman.

When four guys hail a cab after dinner at a trendy Eglinton pub, the last thing they expect is to end up on a quiz show; once they're in the cash cab, the last thing this bunch expects is to be kicked out.

Wanda's excited about getting a tattoo; police crack down on jaywalkers.

Brent installs a security camera at Corner Gas; Davis gets a stun gun.

Wanda goes power mad; Davis and Karen make a dangerous bet; Oscar recalls "the incident" that made him give up the game for good; Brent and Hank are lost in the woods.

Wanda creates her dream video game; Lacey and Karen offer to help Davis release his pent-up stress; Oscar and Emma break out the crokinole board.

Darlene and Ben go apartment hunting; Jackie and Becky take Beverly Rose on a road trip to Mexico to meet her father for the first time; Dan reluctantly shares his financial troubles with Louise.

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.

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.

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.

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.

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.

Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

Darlene and Ben go apartment hunting; Jackie and Becky take Beverly Rose on a road trip to Mexico to meet her father for the first time; Dan reluctantly shares his financial troubles with Louise.

The Conners share their differing takes on why they all think everyone should vote; Louise gets an opportunity that might send her away from Lanford, prompting the family to interfere in Dan's complicated relationship.

Meemaw's gambling room becomes a success; Sheldon dips his toe in the stock market; Missy starts a business.

Sheldon gets an odd request from an old friend, Paige; George Sr. and Mary are caught in the middle of Meemaw and Dale's breakup; Georgie comes clean to Mandy.

Sheldon copes with the death of a hero; Missy wants to babysit; Georgie struggles with his big secret.

George and Mary insist on meeting the new woman in Georgie's life; Sheldon and Missy have suspicions about what's going on with their family.

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.

Sheldon kicks Amy out to work solo; Amy and Leonard bond during a series of science experiments; Bert replaces Wolowitz in the band; Sheldon finds Penny a surprising source of scientific inspiration.

Shoresy starts putting out fires with a players-only meeting.

Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

The Conners share their differing takes on why they all think everyone should vote; Louise gets an opportunity that might send her away from Lanford, prompting the family to interfere in Dan's complicated relationship.

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.

Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

Shoresy starts putting out fires with a players-only meeting.

Meemaw's gambling room becomes a success; Sheldon dips his toe in the stock market; Missy starts a business.

Sheldon gets an odd request from an old friend, Paige; George Sr. and Mary are caught in the middle of Meemaw and Dale's breakup; Georgie comes clean to Mandy.

Sheldon copes with the death of a hero; Missy wants to babysit; Georgie struggles with his big secret.

George and Mary insist on meeting the new woman in Georgie's life; Sheldon and Missy have suspicions about what's going on with their family.

Sheldon kicks Amy out to work solo; Amy and Leonard bond during a series of science experiments; Bert replaces Wolowitz in the band; Sheldon finds Penny a surprising source of scientific inspiration.

Shoresy starts putting out fires with a players-only meeting.

Darlene and Ben go apartment hunting; Jackie and Becky take Beverly Rose on a road trip to Mexico to meet her father for the first time; Dan reluctantly shares his financial troubles with Louise.

The Conners share their differing takes on why they all think everyone should vote; Louise gets an opportunity that might send her away from Lanford, prompting the family to interfere in Dan's complicated relationship.

At bingo night, Wanda steps in after the regular bingo caller takes a tumble; she's a hit with everyone except Emma who takes drastic steps to restore her winning streak.

Hank is unaffected by the mosquitoes; Lacey contributes to the time capsule; Oscar goes back to work at Corner Gas.

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.

Two dudes snap their way to their destination; with only one strike, they decide to go for the video bonus question, but will a question based on Mars prove too challenging?

A group has trouble understanding they're in the cash cab; despite a frosty start, things get tense and exciting on what turns out to be a very challenging ride.

At bingo night, Wanda steps in after the regular bingo caller takes a tumble; she's a hit with everyone except Emma who takes drastic steps to restore her winning streak.

Hank is unaffected by the mosquitoes; Lacey contributes to the time capsule; Oscar goes back to work at Corner Gas.

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.

Two dudes snap their way to their destination; with only one strike, they decide to go for the video bonus question, but will a question based on Mars prove too challenging?

A group has trouble understanding they're in the cash cab; despite a frosty start, things get tense and exciting on what turns out to be a very challenging ride.

At bingo night, Wanda steps in after the regular bingo caller takes a tumble; she's a hit with everyone except Emma who takes drastic steps to restore her winning streak.

Hank is unaffected by the mosquitoes; Lacey contributes to the time capsule; Oscar goes back to work at Corner Gas.

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.

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

A big air show is on nearby and the people of Dog River are excited; Lacey's breach of air show protocol has many in town upset.

Hank is being outwitted by a dog; Brent and Lacy create travel mugs for souvenirs.

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

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

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

A big air show is on nearby and the people of Dog River are excited; Lacey's breach of air show protocol has many in town upset.

Hank is being outwitted by a dog; Brent and Lacy create travel mugs for souvenirs.

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

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

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

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

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.

Lacey's friend Connie comes to Dog River; Davis thinks Karen would make a bad undercover cop.

Shoresy tries to prevent his team from folding.

Shoresy and his new recruits attend a team mixer at Nat's.

The Bulldogs face off against the Timmins Timber Kings and the infamous Apeldoorn brothers.

Shoresy attends his family reunion, and the Bulldogs play the North Bay Norsemen.

The Bulldogs face the powerhouse Soo Cyclones.

The Soo Cyclones return for the Bulldogs' final game of the season.

Shoresy tries to prevent his team from folding.

Shoresy and his new recruits attend a team mixer at Nat's.

The Bulldogs face off against the Timmins Timber Kings and the infamous Apeldoorn brothers.

Shoresy attends his family reunion, and the Bulldogs play the North Bay Norsemen.

The Bulldogs face the powerhouse Soo Cyclones.

The Soo Cyclones return for the Bulldogs' final game of the season.

Shoresy tries to prevent his team from folding.

Shoresy and his new recruits attend a team mixer at Nat's.

The Bulldogs face off against the Timmins Timber Kings and the infamous Apeldoorn brothers.

Shoresy attends his family reunion, and the Bulldogs play the North Bay Norsemen.

The Soo Cyclones return for the Bulldogs' final game of the season.

Brent brings his arsenal of pitches to a slo-pitch game; Davis and Karen can't ignore an act of vandalism.

Hank and Brent are made goodwill ambassadors; a new ATM machine draws a loyal following; Karen tries to learn French.

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.

Asma and her buddies get in the cab on their way to some cocktails downtown when their taxi driver asks whether she needs to go; but this isn't the only surprise question she'll be getting from Adam Growe.

Omar is a funny guy who knows all about the Cash Cab! He even thinks it may be the Cash Cab; as he gets into the cab, he wishes it was the Cash Cab.

Brent brings his arsenal of pitches to a slo-pitch game; Davis and Karen can't ignore an act of vandalism.

Hank and Brent are made goodwill ambassadors; a new ATM machine draws a loyal following; Karen tries to learn French.

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.

Asma and her buddies get in the cab on their way to some cocktails downtown when their taxi driver asks whether she needs to go; but this isn't the only surprise question she'll be getting from Adam Growe.

Omar is a funny guy who knows all about the Cash Cab! He even thinks it may be the Cash Cab; as he gets into the cab, he wishes it was the Cash Cab.

Brent brings his arsenal of pitches to a slo-pitch game; Davis and Karen can't ignore an act of vandalism.

Hank and Brent are made goodwill ambassadors; a new ATM machine draws a loyal following; Karen tries to learn French.

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 isolates herself from her co-workers at Wellman Plastics, leaving them with the impression she is an elitist snob; Louise decides to teach Harris an expensive life lesson; Jackie is determined to keep the restaurant running.

Rachel's boss, Joanna, leaves Chandler in an awkward situation that will require Rachel's help; Monica's catering fiasco.

Joey intervenes when the superintendent, Mr. Treeger, moves to evict Rachel and Monica; Chandler tries to quit a health club.

Chandler falls for a woman who is already involved with Joey; Rachel and Ross play the jealousy game.

Ross starts dating a beautiful but messy co-worker from the museum; Monica and Phoebe cater a sad event.

The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.

Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

Darlene isolates herself from her co-workers at Wellman Plastics, leaving them with the impression she is an elitist snob; Louise decides to teach Harris an expensive life lesson; Jackie is determined to keep the restaurant running.

It's Beverly Rose's first birthday - but it's not all cake and candles - when Becky and Emilio disagree on what kind of party they should have; Jackie is introduced to someone who wants to be more than friends.

Chandler faces a tough choice after his passionate kiss with Joey's girlfriend; Rachel has to learn about dining alone.

To atone for kissing Joey's girlfriend, Chandler agrees to stay inside a shipping crate during the Thanksgiving holiday.

Rachel's career is obstructed by her boss, Joanna; Monica faces a big decision; Chandler, Ross and Joey party.

Ross struggles to maintain a long-distance relationship; Chandler's well-intended attempts to get Rachel a date seem to miss the mark; Monica's plan to assert some authority at her new restaurant goes awry.

The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.

Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room for a quiet place to work.

Sheldon petitions Wil Wheaton to appear on the new "Professor Proton" show, but Wil offers a role to Amy instead; Penny gets angry when she thinks the female protagonist in Leonard's novel is based on her.

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

It's Beverly Rose's first birthday - but it's not all cake and candles - when Becky and Emilio disagree on what kind of party they should have; Jackie is introduced to someone who wants to be more than friends.

The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.

Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room for a quiet place to work.

Chandler faces a tough choice after his passionate kiss with Joey's girlfriend; Rachel has to learn about dining alone.

To atone for kissing Joey's girlfriend, Chandler agrees to stay inside a shipping crate during the Thanksgiving holiday.

Rachel's career is obstructed by her boss, Joanna; Monica faces a big decision; Chandler, Ross and Joey party.

Ross struggles to maintain a long-distance relationship; Chandler's well-intended attempts to get Rachel a date seem to miss the mark; Monica's plan to assert some authority at her new restaurant goes awry.

Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room for a quiet place to work.

Sheldon petitions Wil Wheaton to appear on the new "Professor Proton" show, but Wil offers a role to Amy instead; Penny gets angry when she thinks the female protagonist in Leonard's novel is based on her.

Darlene isolates herself from her co-workers at Wellman Plastics, leaving them with the impression she is an elitist snob; Louise decides to teach Harris an expensive life lesson; Jackie is determined to keep the restaurant running.

It's Beverly Rose's first birthday - but it's not all cake and candles - when Becky and Emilio disagree on what kind of party they should have; Jackie is introduced to someone who wants to be more than friends.

Lacey brings wine to dinner at the Leroy home; Hank's life is turned upside down when he wins the lottery.

Brent is stuck with a phony one hundred dollar bill; Lacey gets the job of landing a new doctor.

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 this couple gets in the cab, it seems as though Michelle knows what's going on; but it quickly becomes clear that this girl is just a joker without a clue.

Two nice guys are caught off guard when they find out their trip to downtown is actually a game; they've heard of the show and so it doesn't take them long to collect themselves; will they collect some cash?

Lacey brings wine to dinner at the Leroy home; Hank's life is turned upside down when he wins the lottery.

Brent is stuck with a phony one hundred dollar bill; Lacey gets the job of landing a new doctor.

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 this couple gets in the cab, it seems as though Michelle knows what's going on; but it quickly becomes clear that this girl is just a joker without a clue.

Two nice guys are caught off guard when they find out their trip to downtown is actually a game; they've heard of the show and so it doesn't take them long to collect themselves; will they collect some cash?

Lacey brings wine to dinner at the Leroy home; Hank's life is turned upside down when he wins the lottery.

Brent is stuck with a phony one hundred dollar bill; Lacey gets the job of landing a new doctor.

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.

Darlene's friendship with a manager at Wellman Plastics lands her in an awkward situation; Louise's brother tries to win over Jackie by making a thoughtful gesture, creating uncomfortable tension.

Chandler faces a tough choice after his passionate kiss with Joey's girlfriend; Rachel has to learn about dining alone.

To atone for kissing Joey's girlfriend, Chandler agrees to stay inside a shipping crate during the Thanksgiving holiday.

Rachel's career is obstructed by her boss, Joanna; Monica faces a big decision; Chandler, Ross and Joey party.

Ross struggles to maintain a long-distance relationship; Chandler's well-intended attempts to get Rachel a date seem to miss the mark; Monica's plan to assert some authority at her new restaurant goes awry.

Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.

Sheldon and Penny share secrets while Leonard is away; Wolowitz helps Raj get over his ex.

Darlene's friendship with a manager at Wellman Plastics lands her in an awkward situation; Louise's brother tries to win over Jackie by making a thoughtful gesture, creating uncomfortable tension.

Harris' job is in jeopardy after joining a protest she strongly believes in, leading to tense discussions within the family; Jackie makes a visit to Wellman Plastics only to realize the company is instituting supervised drug testing.

Future versions of Ted and Barney try to talk Ted into seeing Robots Versus Wrestlers; Marshall wants to have a dance-off with Robin.

Lily worries Marshall will resent her if she accepts The Captain's offer to move to Rome for a year; Ted and Barney obsess over an attractive girl in a puffy coat.

The gang tries to plan a legendary bachelor party for Barney.

Robin desperately searches for something she once buried in Central Park; Barney and Robin Sr. (Ray Wise) bond.

Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.

Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy; Bernadette and Wolowitz have a hard time deciding who should stay at home with the kids and who should go back to work.

Penny gets the opportunity to host Bill Gates at work when his company wants to partner with hers; Leonard, Koothrappali and Wolowitz do everything in their power to meet him; Sheldon thinks he is the victim of a prank.

Sheldon and Penny share secrets while Leonard is away; Wolowitz helps Raj get over his ex.

Harris' job is in jeopardy after joining a protest she strongly believes in, leading to tense discussions within the family; Jackie makes a visit to Wellman Plastics only to realize the company is instituting supervised drug testing.

Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.

Sheldon and Penny share secrets while Leonard is away; Wolowitz helps Raj get over his ex.

Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy; Bernadette and Wolowitz have a hard time deciding who should stay at home with the kids and who should go back to work.

Future versions of Ted and Barney try to talk Ted into seeing Robots Versus Wrestlers; Marshall wants to have a dance-off with Robin.

Lily worries Marshall will resent her if she accepts The Captain's offer to move to Rome for a year; Ted and Barney obsess over an attractive girl in a puffy coat.

The gang tries to plan a legendary bachelor party for Barney.

Robin desperately searches for something she once buried in Central Park; Barney and Robin Sr. (Ray Wise) bond.

Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy; Bernadette and Wolowitz have a hard time deciding who should stay at home with the kids and who should go back to work.

Penny gets the opportunity to host Bill Gates at work when his company wants to partner with hers; Leonard, Koothrappali and Wolowitz do everything in their power to meet him; Sheldon thinks he is the victim of a prank.

Darlene's friendship with a manager at Wellman Plastics lands her in an awkward situation; Louise's brother tries to win over Jackie by making a thoughtful gesture, creating uncomfortable tension.

Harris' job is in jeopardy after joining a protest she strongly believes in, leading to tense discussions within the family; Jackie makes a visit to Wellman Plastics only to realize the company is instituting supervised drug testing.

Lacey discovers the dark secret behind the town's name; Brent's old band reunites.

A big air show is on nearby and the people of Dog River are excited; Lacey's breach of air show protocol has many in town upset.

Brent and Oscar form competing rinks in a cross-generational curling grudge match and Lacey is stuck in the middle.

Lacey's not invited to the Harvest Dance; Emma's dreaded jelly salad; Hank falls for highway worker.

Luc, Dave and Amanda are just a happy-go-lucky team that quickly clue into the fact that this show is on the Discovery Channel.

The couple is not sure of where they're going, and it sounds as though Adam doesn't either; everything is forgotten until Paul doesn't agree with one of Adam's judgments.

Lacey discovers the dark secret behind the town's name; Brent's old band reunites.

A big air show is on nearby and the people of Dog River are excited; Lacey's breach of air show protocol has many in town upset.

Brent and Oscar form competing rinks in a cross-generational curling grudge match and Lacey is stuck in the middle.

Lacey's not invited to the Harvest Dance; Emma's dreaded jelly salad; Hank falls for highway worker.

Luc, Dave and Amanda are just a happy-go-lucky team that quickly clue into the fact that this show is on the Discovery Channel.

The couple is not sure of where they're going, and it sounds as though Adam doesn't either; everything is forgotten until Paul doesn't agree with one of Adam's judgments.

Lacey discovers the dark secret behind the town's name; Brent's old band reunites.

A big air show is on nearby and the people of Dog River are excited; Lacey's breach of air show protocol has many in town upset.

Brent and Oscar form competing rinks in a cross-generational curling grudge match and Lacey is stuck in the middle.

Lacey's not invited to the Harvest Dance; Emma's dreaded jelly salad; Hank falls for highway worker.

Ben's mom arrives after an unexpected death and unveils shocking information from the past; Becky and Emilio spend more time together.

Future versions of Ted and Barney try to talk Ted into seeing Robots Versus Wrestlers; Marshall wants to have a dance-off with Robin.

Lily worries Marshall will resent her if she accepts The Captain's offer to move to Rome for a year; Ted and Barney obsess over an attractive girl in a puffy coat.

The gang tries to plan a legendary bachelor party for Barney.

Robin desperately searches for something she once buried in Central Park; Barney and Robin Sr. (Ray Wise) bond.

Leonard and Sheldon's friendship is tested; Wolowitz's relationship with his mom causes a threat to his masculinity.

Raj designs a scavenger hunt that brings out the best - and the worst - in the whole gang.

Sheldon wants revenge after Amy ruins one of his favorite films; Leonard finds a way to get Penny to do anything; Stuart and Raj make online dating profiles.

Ben's mom arrives after an unexpected death and unveils shocking information from the past; Becky and Emilio spend more time together.

Harris brings home her new friend, Josh, leaving the family questioning his intentions; Becky and Ben's attempt to build a closet stirs up family drama.

As the gang gets ready for Robin and Barney's wedding, Ted invites Lily to see the house he has finished fixing up; an obnoxious couple ruins Barney and Robin's night of relaxation; Marshall takes the baby to Minnesota for a family visit.

Robin and Barney make a startling discovery; something on the Internet alters Marshall's journey; Lily talks to Ted about Robin.

Robin wonders how Barney will react when James reveals that he is getting divorced; Marshall tries to get to New York in time for the wedding.

Lily becomes frustrated that she is the only one who knows about Ted's plans; Barney and Robin try to spend time together before their relatives arrive for the wedding.

Leonard and Sheldon's friendship is tested; Wolowitz's relationship with his mom causes a threat to his masculinity.

Raj designs a scavenger hunt that brings out the best - and the worst - in the whole gang.

Leonard decides to run against Sheldon for president of the tenants association; Bernadette encourages Wolowitz and Koothrappali to find the owner of a drone after they find it in the backyard.

A brilliant but reclusive scientist, Doctor Wolcott, invites Sheldon to his cabin in the middle of nowhere; Penny and Bernadette improvise after Amy doesn't like the tame bachelorette party they planned for her.

Conan O'Brien travels to Ghana with actor Sam Richardson whose family hails from the African nation.

Leonard and Sheldon's friendship is tested; Wolowitz's relationship with his mom causes a threat to his masculinity.

Raj designs a scavenger hunt that brings out the best - and the worst - in the whole gang.

Sheldon wants revenge after Amy ruins one of his favorite films; Leonard finds a way to get Penny to do anything; Stuart and Raj make online dating profiles.

Leonard decides to run against Sheldon for president of the tenants association; Bernadette encourages Wolowitz and Koothrappali to find the owner of a drone after they find it in the backyard.

As the gang gets ready for Robin and Barney's wedding, Ted invites Lily to see the house he has finished fixing up; an obnoxious couple ruins Barney and Robin's night of relaxation; Marshall takes the baby to Minnesota for a family visit.

Robin and Barney make a startling discovery; something on the Internet alters Marshall's journey; Lily talks to Ted about Robin.

Robin wonders how Barney will react when James reveals that he is getting divorced; Marshall tries to get to New York in time for the wedding.

Lily becomes frustrated that she is the only one who knows about Ted's plans; Barney and Robin try to spend time together before their relatives arrive for the wedding.

Leonard decides to run against Sheldon for president of the tenants association; Bernadette encourages Wolowitz and Koothrappali to find the owner of a drone after they find it in the backyard.

A brilliant but reclusive scientist, Doctor Wolcott, invites Sheldon to his cabin in the middle of nowhere; Penny and Bernadette improvise after Amy doesn't like the tame bachelorette party they planned for her.

Ben's mom arrives after an unexpected death and unveils shocking information from the past; Becky and Emilio spend more time together.

Harris brings home her new friend, Josh, leaving the family questioning his intentions; Becky and Ben's attempt to build a closet stirs up family drama.

Brent behaves differently when Wanda wears a skirt to work; feeling empowered, she tests the limits of her feminine charm, but Brent's new attitude toward her may not be motivating.

Hank's premonitions freak Wanda out; Lacey fixes the pothole.

When Emma gives Brent flack over his coffee drinking, he vows to quit cold turkey if she quits knitting; as Brent struggles in a caffeine free world, Emma takes up a new pastime.

Karen buys a new breathalyzer machine; Lacey puts up a new bulletin board.

Hank is being outwitted by a dog; Brent and Lacy create travel mugs for souvenirs.

Brent's annual trip to exotic locales stirs jealousy; Oscar experiments with e-mail.

Sheldon and Amy's relationship is tested when she takes a job at his university; a fight with Bernadette leaves Howard sleeping on Raj's couch.

Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.

When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.

When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests; Leonard and Penny deal with an error from her past.

Amy and Leonard try to help Sheldon deal with his shame; Raj stays with Bernadette and Howard for a week.

As Leonard tries to help Penny with a disappointment, Penny asks him a bold question about their relationship; Sheldon wants to learn how to be funny.

Sheldon must learn how to relax when he is forced to take a vacation; Leonard tries to support Penny when she quits her job; Bernadette needs to replace one of Stuart's comic books.

Unable to get Comic-Con tickets, Sheldon tries to hold his own convention and ends up spending a wild evening with James Earl Jones; the ladies try to act maturely.

Sheldon and Amy go on a trip to wine country with Howard and Bernadette; Penny and Leonard rush Raj's dog to the vet.

When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life; Bernadette is torn when Wolowitz gets the chance to go back to space.

Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.

Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.

Raj struggles with guilt when he dates two women at once; Penny has a chance to play a part in a cheesy movie; Sheldon is torn between two gaming systems.

Sheldon and Amy's relationship is tested when she takes a job at his university; a fight with Bernadette leaves Howard sleeping on Raj's couch.

Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.

When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.

When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests; Leonard and Penny deal with an error from her past.

Amy and Leonard try to help Sheldon deal with his shame; Raj stays with Bernadette and Howard for a week.

As Leonard tries to help Penny with a disappointment, Penny asks him a bold question about their relationship; Sheldon wants to learn how to be funny.

Sheldon must learn how to relax when he is forced to take a vacation; Leonard tries to support Penny when she quits her job; Bernadette needs to replace one of Stuart's comic books.

Unable to get Comic-Con tickets, Sheldon tries to hold his own convention and ends up spending a wild evening with James Earl Jones; the ladies try to act maturely.

Sheldon and Amy go on a trip to wine country with Howard and Bernadette; Penny and Leonard rush Raj's dog to the vet.

When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life; Bernadette is torn when Wolowitz gets the chance to go back to space.

Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.

Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.

Raj struggles with guilt when he dates two women at once; Penny has a chance to play a part in a cheesy movie; Sheldon is torn between two gaming systems.

Sheldon and Amy's relationship is tested when she takes a job at his university; a fight with Bernadette leaves Howard sleeping on Raj's couch.

Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.

When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.

When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests; Leonard and Penny deal with an error from her past.

Amy and Leonard try to help Sheldon deal with his shame; Raj stays with Bernadette and Howard for a week.

As Leonard tries to help Penny with a disappointment, Penny asks him a bold question about their relationship; Sheldon wants to learn how to be funny.

Sheldon must learn how to relax when he is forced to take a vacation; Leonard tries to support Penny when she quits her job; Bernadette needs to replace one of Stuart's comic books.

Unable to get Comic-Con tickets, Sheldon tries to hold his own convention and ends up spending a wild evening with James Earl Jones; the ladies try to act maturely.

Sheldon and Amy go on a trip to wine country with Howard and Bernadette; Penny and Leonard rush Raj's dog to the vet.

When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life; Bernadette is torn when Wolowitz gets the chance to go back to space.

Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.

Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.

Raj struggles with guilt when he dates two women at once; Penny has a chance to play a part in a cheesy movie; Sheldon is torn between two gaming systems.

Lacey wants to start a running club; Hank's new crossing guard job.

Brent and Hank battle to take back their childhood tree house; Oscar's in denial.

Brent purchases a new digital camera; trivia showdown; Oscar is haunted by a ceramic gnome.

Oscar tries to fix a roof; Brent and Karen write a kid's book on bike safety.

Brent fears he is losing his hair; Wanda gets a new lamp and has to fight to keep it.

Lacey starts a coffee shop newsletter; Oscar's childhood dream.

Phoebe's brother (Giovanni Ribisi) asks her to carry a baby for him and his wife; Chandler gets lessons in love; Joey finds himself in a class struggle.

Phoebe undergoes an embryo implant procedure to become a surrogate mother for her brother (Giovanni Ribisi) and his wife (Debra Jo Rupp); Monica and Rachel wager their apartment in a trivia game against Chandler and Joey.

Rachel's setback at work leads to a new romantic interest; Chandler is jealous of Kathy's onstage co-star.

A visit to a strip joint fails to cheer up Chandler; Rachel gets Ross to go to an opera; Charlton Heston finds Joey in a compromising position during a movie shoot.

Ross takes up rugby to impress Emily (Helen Baxendale); Chandler sets up a ruse to avoid his former girlfriend Janice (Maggie Wheeler).

Rachel throws a surprise party for Emily so she can invite Joshua; Phoebe develops a craving for meat.

Ross tells Emily (Helen Baxendale) how he feels about her; Chandler and Joey suddenly receive a free adult TV channel in their apartment; Phoebe gets some surprising news about her pregnancy.

Ross has concerns about Emily's interests; Rachel's plans for Joshua are upset by a late change of venue.

Ross tries to keep Emily from returning to London; Monica and Rachel attempt to win back their apartment.

Monica and Phoebe find life in wedding attire has its charm; Rachel asks Joshua for more spontaneity.

Rachel and Ross reminisce separately about when they dated each other; the friends get invitations to Ross's wedding, but not all of them are going.

Chandler and Joey compete to be best man at Ross' wedding; Joey loses Ross' treasured wedding ring; Phoebe suffers extreme mood swings because of her pregnancy.

Rachel, Monica, Joey, Chandler and Ross go to London for the wedding where Joey meets Sarah Ferguson, the Duchess of York.

Rachel frantically tries to get to London to tell Ross that she loves him before he marries Emily; Ross' parents argue with Emily's parents, Steven and Andrea Waltham.

Phoebe's brother (Giovanni Ribisi) asks her to carry a baby for him and his wife; Chandler gets lessons in love; Joey finds himself in a class struggle.

Phoebe undergoes an embryo implant procedure to become a surrogate mother for her brother (Giovanni Ribisi) and his wife (Debra Jo Rupp); Monica and Rachel wager their apartment in a trivia game against Chandler and Joey.

Rachel's setback at work leads to a new romantic interest; Chandler is jealous of Kathy's onstage co-star.

A visit to a strip joint fails to cheer up Chandler; Rachel gets Ross to go to an opera; Charlton Heston finds Joey in a compromising position during a movie shoot.

Ross takes up rugby to impress Emily (Helen Baxendale); Chandler sets up a ruse to avoid his former girlfriend Janice (Maggie Wheeler).

Rachel throws a surprise party for Emily so she can invite Joshua; Phoebe develops a craving for meat.

Ross tells Emily (Helen Baxendale) how he feels about her; Chandler and Joey suddenly receive a free adult TV channel in their apartment; Phoebe gets some surprising news about her pregnancy.

Ross has concerns about Emily's interests; Rachel's plans for Joshua are upset by a late change of venue.