Sheldon becomes a dorm RA. Meemaw and Dale make a sketchy business deal. Mary and George Sr. rekindle their romance.

Sheldon's search for a comic book leads him to a breakthrough. Also, Georgie and Mandy have an uncomfortable first encounter with her parents, Jim and Audrey.

Sheldon's database invention puts him at odds with the university. Also, the church takes issue with Meemaw's video store.

Sheldon considers dropping out of college to focus on building his database. Also, George Sr. is frustrated when someone else gets credit for his football wins.

Mary struggles to make new friends while Mandy pushes Georgie to date another woman.

Rachel schemes to get a handsome client to ask her on a date. Chandler's jealousy causes problems with his girlfriend.

Charlton Heston finds Joey in a compromising position during a movie shoot. Rachel regrets asking Ross for a favor.

Chandler's annoying former girlfriend reappears. Ross plays rugby to impress Emily with painful results.

Trying to become better acquainted with her sexy client, Rachel inadvertently thwarts Ross' plans for a romantic evening with his girlfriend.

Monica helps Ross tell his girlfriend that he loves her. Phoebe gets some surprising news about her pregnancy.

Ross and his ex-wife become jealous when their lovers go to England together. Rachel's plans to seduce her boyfriend go awry.

Drastic changes occur in Ross' relationship with Emily. Monica and Rachel will do anything to get their old apartment back from the guys.

Rachel reacts drastically to Ross' engagement. Chandler becomes exasperated by Joey's snoring.

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

Joey loses Ross' treasured wedding ring. Phoebe has extreme mood variations from her pregnancy.

Rachel stays home while the others go to England for Ross' wedding.

Rachel frantically tries to get to London before Ross marries Emily. Ross' father clashes with Emily's.

Will Emily forgive Ross before their honeymoon? Monica and Chandler agree to end their new relationship.

Sheldon and Amy are devastated learning from a Russian paper that Super Asymmetry has been discovered and disproven. Ultra-competitive Bernadette asks Stuart's girlfriend, Denise, to teach her how to beat Howard in a popular videogame.

Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon's past inspires him not to give up. Bernadette turns into a pageant mom when she tries to help Howard ace his Magic Castle audition.

Penny and Leonard organize a paintball game that results in mayhem when Sheldon is jealous of Amy. Raj catches Anu with her ex-boyfriend, and Stuart doesn't want to move in with Denise.

Penny's ex-boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard to help. Raj attempts to mend things with his ex-fiancée, Anu.

Sheldon and Amy's super asymmetry theory is proven by two physicists, Dr. Pemberton and Dr. Campbell from Chicago, who then try to kick Amy off the Nobel nomination. Bernadette has a big success at work, and Penny's going to be a part of it.

Sheldon is thrilled to help Bernadette and Howard navigate bureaucratic paperwork, until he discovers they are breaking the law. Leonard is disappointed when his friends exclude him from a scientific project.

Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa. Howard, Bernadette, Anu and Raj turn Raj's canceled bachelor party into a couple's trip aboard the "vomit comet."

Our Wipeout teams are THIRSTY. They include a team of PDA-loving first responders and another team begging Jackie Chan to adopt them. Only by completing the toughest Wipeout course in history can their thirst for $25,000 be quenched.

Rick and Fred are best friends who have each been married for many years. When they show signs of restlessness, their wives take a bold approach to revitalizing their marriages by granting them one week of freedom to do whatever they want.

Dim-witted friends Lloyd and Harry go on a road trip to return a briefcase to Mary Swanson, whom Lloyd has fallen for. Unaware that the briefcase is full of ransom money, the two friends head for Aspen, oblivious to the cops and crooks in hot pursuit.

Ross tells Rachel that he cannot be around her once Emily comes to New York. Chandler and Monica try to have a romantic weekend.

Will Ross obey Emily and move away from his friends? Monica and Rachel meet a monster.

Joey and Chandler regret letting Ross move in with them. Rachel schemes to get her new neighbor to ask her on a date.

The friends find out about Monica's worst Thanksgiving ever.

Joey becomes exasperated from hiding Chandler and Monica's secret. Ross gets in trouble when he expresses his rage.

The Jokers are breaking and entering a home for a commercial where they showcase their wackiest and most over the top performances. To top it off, one loser will be troll-ing his way through the Liberty Science Center's Touch Tunnel!

Sandra Bullock is a straight-laced FBI agent who is forced to partner with foul-mouthed Boston cop Melissa McCarthy in this raucous comedy.

Three long-suffering office professionals concoct a hairbrained plot to murder their maniacal bosses in this raucous comedy.

The Horrible Boss avengers become bosses themselves -- of their own entrepreneurial effort -- in this raucous sequel to the hit comedy.

The gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game involving William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith. Deception and betrayal are the path to make it to the one open seat.

Penny and Bernadette go to San Diego for a pharmaceutical sales convention, leaving Howard in charge of the kids. Sheldon finds a book on experimenting on kids, and the guys plus Amy make a day of it.

Pemberton and Campbell charm America on a publicity tour, so Sheldon and Amy bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side. Halley's fear of the dark leads to conflict for Howard, Bernadette and Stuart.

Amy has a meltdown due to the pressure associated with winning a Nobel Prize. Raj and Howard try to relive the good old days after Howard buys a scooter that looks like the one he had years ago.

Raj is worried people won't take him seriously in his own field after publishing a paper that suggests he may have discovered alien life. Leonard wants to be the principal investigator on a plasma physics study.

Kripke has proof that Dr. Pemberton plagiarized his thesis, and Sheldon and Amy aren't sure whether they should turn him in or not. Howard is surprised to learn that Bernie wasn't the only waitress at the Cheesecake Factory who had a crush on him.

Three long-suffering office professionals concoct a hairbrained plot to murder their maniacal bosses in this raucous comedy.

The Horrible Boss avengers become bosses themselves -- of their own entrepreneurial effort -- in this raucous sequel to the hit comedy.

Sandra Bullock is a straight-laced FBI agent who is forced to partner with foul-mouthed Boston cop Melissa McCarthy in this raucous comedy.

Sheldon learns the university is building a database without him. Also, Mary takes care of a bedridden Mandy and Meemaw.

Mary butts heads with Mandy's mother, and Sheldon attempts male bonding.

Paige drags Sheldon to a college party, and Missy gets caught in a lie.

The Coopers can't be found as Mandy goes into labor. Also, Sheldon is excited about the launch of his database.

Sheldon confronts the failure of his database. Georgie and Mandy struggle as new parents. Missy feels forgotten.

Missy steals her dad's truck and hits the road with her friend Paige.

Chandler thinks Monica wants more from their relationship. Ross fails to impress his new neighbors.

Joey wonders if he is in love with Monica. Phoebe impersonates a police officer.

Rachel interviews for a great job but she may get it for the wrong reason. Monica competes to have a better relationship than Phoebe's.

Rachel submits to peer pressure at work. Joey and Ross' son audition for the same commercial but only one can get the part.

Ross' flirting technique fails to impress a cute pizza-delivery woman. A surprise awaits Joey when he tells everyone about his big television appearance.

The guys enjoy riding along with a police officer until a gunshot is heard. Rachel overhears a telephone message for Ross from his second ex-wife.

Phoebe's boyfriend wants her to move in with him. Ross and Joey involve Chandler and Monica in an obsessive game.

Joey's first major film role leads to an unexpected experience in Las Vegas. Phoebe can't remember why she hates Ross.

The gang travels to Las Vegas, Nevada, where more than one surprise awaits. After Ross misinterprets Rachel's actions, a war of public humiliation results.

Monica and Chandler get lucky in Las Vegas, Nevada. Rachel makes Ross regret playing a prank on her. Joey schemes for fame and fortune.

Two of the friends leave Las Vegas married. Joey and Phoebe have a cross-country adventure.

Monica is bewildered by Rachel's reaction to a change in their living arrangement. Phoebe tries to make Ross confront his feelings for Rachel.

Despite Phoebe's admonitions, Ross makes a drastic decision about Rachel. Chandler and Monica bicker over their living arrangements.

Kripke has proof that Dr. Pemberton plagiarized his thesis, and Sheldon and Amy aren't sure whether they should turn him in or not. Howard is surprised to learn that Bernie wasn't the only waitress at the Cheesecake Factory who had a crush on him.

Leonard is pleasantly surprised when Beverly comes to visit and she's genuinely kind to him, until he finds out the real reason she's there. Denise and Stuart overstay their welcome at the Wolowitz house.

Amy and Sheldon wait for the news. Howard and Bernadette leave their kids. Leonard and Penny keep a secret.

Bernadette and Howard leave their kids for the first time, Penny and Leonard try to keep a secret, Sheldon and Amy stick together, and Raj makes a new friend as the gang travels together into an uncharted future.

Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.

Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.

Stan gets Francine baseball tickets for her birthday but is upset when they have a horrible kiss on the kiss cam. Steve and Roger head to Nevada to help clean polluted water.

When Stan is given the task of putting together the CIA calendar, Hayley attempts to destroy it. Meanwhile, Roger gets a Discover card and fakes his death to get out of paying the enormous balance.

Roger becomes a teacher at Steve's school and gets involved with a class of underprivileged kids. Meanwhile, Stan and Francine visit a retirement home and Stan decides to stay.

Stan, tattooed and haunted, travels a barren Langley Falls alone. Meanwhile, a mysterious element known as The Two Hundred has reigned terror on the town and separated Stan from his family

Steve and Snot alter their futures when they throw a party for the uncool kids. Meanwhile, Roger is disgruntled when a waitress doesn't compliment his order and Stan and Francine go on vacation in Bosnia.

Roger loses his identity after becoming fascinated by a local dentist's wife. Meanwhile, Klaus throws a party when Stan and the kids are unable to move from being sore after working out.

When Stan is on a mission, Francine pretends she's a widow. Steve and his friends play wrestling and get beat up by Principal Lewis.

Francine joins in on Steve and his pals' live-action role-playing game. Stan opens a knock-off Seaworld in the house.

Stan loses his faith in religion after Steve questions everything in the Bible. He takes the family to Korea to investigate the rumors of a reinvented "Noah's Ark."

Stan and Francine lose their memories and resort to primitive living on an island, Hayley and Jeff are rescued by the Navy and Jeff decides to enlist, and Roger and Steve try to survive on a lifeboat in the middle of the ocean.

Georgie goes on a birthday date, and Mary confronts Brenda about her relationship with George. Also, Sheldon takes an interest in Missy's favorite TV show.

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

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

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

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

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

On Thanksgiving, Chandler tries to gain favor with Monica's parents but an old secret involving Ross causes problems. Undomestic Rachel's dessert proves intriguing.

Joey plots the perfect opportunity to kiss Janine. Ross and Monica resurrect their dorky high school dance routine for a television special.

Joey finally dates Janine but she doesn't like his friends. Rachel worries Phoebe won't appreciate the way she furnishes their apartment.

Ross and Chandler bicker over which of them created a raunchy joke. Phoebe antagonizes Monica and Rachel with her candor. Joey reluctantly takes a waiter job at Central Perk.

Rachel tries to help her pampered younger sister, Jill, find independence but Jill flirting with Ross is not part of the plan. Monica won't admit that she is sick.

Rachel's sister Jill wants Ross but not for the reasons he thinks. Chandler astounds the others with his inability to express emotions. Is Phoebe starring in pornography?

The friends fantasize Rachel and Ross are in respective loveless marriages. Monica is an overweight virgin. Poor Chandler works for television star Joey, and Phoebe is an overstressed stockbroker.

In the speculative fantasy, Ross initiates romantic advances with his wife Carol. Chandler and Monica help each other overcome loneliness, Rachel learns the truth about her husband and Phoebe sneaks out of the hospital.

Chandler gets into trouble with his homemade gift for Monica. Ross tries to teach martial arts to Rachel and Phoebe. Joey hires a look-alike.

When a fire damages their apartment, Rachel and Phoebe must choose between living temporarily with Joey or Monica. Ross gets into trouble where he teaches.

Ross worries when his student/girlfriend goes on vacation with her wild friends. Meanwhile, Joey's refrigerator breaks down.

Primarily composed of clips from earlier shows, Joey auditions for a major television role but Chandler almost ruins everything.

Ross is nervous about meeting Paul, Elizabeth's dad, and invites the gang to the coffeehouse for moral support.

Leonard asks a work colleague out after he finds out Penny is seeing someone.

Sheldon's getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine.

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills.

When Wolowitz goes AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team.

Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon.

When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.

Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent. However, Sheldon's lie becomes a bit too complicated for its own good.

With his friends knowing how sour he acts when sick and avoiding him as a result, Sheldon is nursed by Penny, who hasn't a clue what she's in for.

With Sheldon rattled and impossible to be around after meeting Dennis, a 15-year-old physicist who's smarter than he, the rest of the guys search for a way to eliminate the threat.

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team hoping to prove he's superior.

When the delivery of a full-size prop of 1960's "The Time Machine" causes Penny to miss work, she scolds Leonard about his sci-fi collectibles. He decides it's time to give up such childish pursuits.

The rest of the gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll be the one to decide who can date her.

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

Penny's breakup spurs Leonard to summon the courage to ask her out, and they both go to Sheldon for advice on their upcoming date.

Monica is outraged to find out what her parents did with her wedding fund. Joey discovers Rachel's late-night reading material.

Monica desperately tries to figure out a secret cookie recipe. Chandler fails to impress Monica's father.

Rachel is in a quandary when a sexy but unqualified man applies to be her assistant. Chandler, Monica and Ross tell embarrassing secrets about one another.

Joey tries to teach Chandler how to smile for the camera. Phoebe and Ross bicker over their divorcing friends.

Rachel and Phoebe compete to be Monica's maid of honor but Monica doesn't want to make the decision. Chandler tries to apologize to a girlfriend from his youth.

Chandler's former girlfriend manipulates Chandler and Monica. Rachel and Phoebe meddle in Joey's relationship.

Chandler's irrational fear causes problems when Phoebe brings home a cute dog. Rachel's assistant gives her a Thanksgiving surprise.

Rachel gets in trouble for dating her assistant. Monica tries to become friendlier with her neighbors. Phoebe needs lessons in riding a bike.

Ross teaches Ben about Chanukah. Phoebe worries that Rachel prefers living with Joey.

Phoebe's former boyfriend returns for one night only but Joey could ruin their plans. Monica plots revenge on her cousin's wedding day.

Monica falls asleep during sex. Rachel argues with Tag. Ross and Joey get stranded on the roof.

Phoebe becomes involved with a suicidal office worker. Rachel breaks Joey's favorite chair. Monica's beloved childhood belongings are destroyed.

Rachel's 30th birthday prompts the friends to reminisce about their own 30th birthdays.

Penny opens up to a reluctant Sheldon after a less-than-stellar first date with Leonard, placing him in the uncomfortable position of having to keep a secret.

Seeing Penny with another guy sends Leonard back to Leslie Winkle, much to Sheldon's dismay.

Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistently pesters Sheldon for advice.

Full of confidence following being named one of People's 30 to Watch Under 30, Raj hits on Penny and becomes impossibly arrogant.

An intervention is used to try to force Sheldon to overcome his fear of driving.

Sheldon and his friends are mystified when a younger undergraduate student is attracted to him.

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate. Howard and Raj search for the America's Next Top Model house.

Chandler confronts his estranged cross-dressing father. Rachel gets into trouble driving Monica's Porsche.

On the eve of the wedding, Ross searches for missing Chandler, who has doubts, while the girls distract unsuspecting Monica.

Monica remains blissfully unaware of the potential disasters on her wedding day.

The reception following Monica and Chandler's wedding is almost upstaged by the news that a member of the group might be pregnant.

Rachel debates whether she should break the news to her baby's father.

The real father of Rachel's baby is revealed. Monica and Chandler struggle to make their honeymoon flight.

Ross reveals that he videotaped a sexual encounter between Rachel and him.

Ross is horrified when Rachel goes on a date with a soap-opera star. Phoebe is attracted to a clumsy chef whom Monica wants to fire.

At Monica's Halloween party, Phoebe meets her twin sister's fiance and finds that she is attracted to him.

Rachel wants to find her own apartment. Phoebe is ecstatic when Eric dumps Ursula to date her.

Rachel tells her belligerent father that she is pregnant with Ross' child.

Monica encounters a high-school friend and invites him to Thanksgiving Day dinner.

Chandler is angry when Monica buys expensive boots. Phoebe tries to get tickets to a Sting concert.

Sheldon wants to use an alternate version of rock-paper-scissors to help resolve conflicts. A girl Wolowitz has a major crush on falls for Leonard.

Sheldon is over-exuberant that Leonard finally has a girlfriend matching his high standards.

Leonard seeks Penny's counsel when his relationship with Stephanie takes off faster than he'd like. Sheldon's hypochondriac tendencies get the better of him.

Sheldon irks the gangs with his obsession with proper Christmas gift protocol. Leonard's crushed when Penny dates a colleague of his.

Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of the guys are depending on him for.

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

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

A visit from Leonard's mother ends up bringing him and Penny closer.

Paintball leads to a squabble between Sheldon and Penny as well as romance between Howard and Leslie.

The gang is thrilled when they see Terminator: The Sarah Connor Chronicles' Summer Glau is also aboard their train to San Francisco for a scientific symposium. Sheldon frets over having forgotten a paper he wants to present to George Smoot.

Penny's business selling hair accessories out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge.

Penny feels threatened when another sexy woman moves into the apartment building and angered when she senses the guys are being taken advantage of.

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

Leonard and Raj take Wolowitz to Las Vegas to help him get over his break-up with Leslie. Sheldon, home alone and looking forward to it, locks himself out and has only one other place to stay: Penny's.

Leonard is torn between being honest or self-serving when Stuart asks his advice for an upcoming second date with Penny. Wolowitz realizes there's a crucial error in a toilet he designed for the International Space Station.

Will Smith stars as a technology-averse cop in a not-so-distant future who becomes convinced that a robot is responsible for a prominent scientist's murder.

Murr, Q and Sal will be sitting alongside a stranger to participate in a documentary-style interview. Then, they'll be trying to upcharge guests again as hotel concierge. At the end, one of them will be working up a sweat as Peloton's biggest nightmare.

Meet 9-year-old Sheldon and his family on the series premiere! Sheldon learns that his high intelligence isn't always helpful growing up in East Texas, where church and football are king.

Sheldon goes on a quest to make his first friend.

Sheldon's faith is shaken when his dad goes to the hospital.

Sheldon refuses to eat solid food after a choking scare.

Monica prepares a memorable St. Valentine's Day for Chandler with sexy lingerie and X-rated entertainment.

Joey tells Rachel that he is in love with her.

Rachel devises a lie about her unborn child that she hopes will break the silence between her and Joey. Phoebe reads tea leaves and predicts she will soon encounter the man of her dreams.

Phoebe brings her annoyingly upbeat boyfriend to the 35th anniversary of Monica and Ross' parents, who urge Ross and pregnant Rachel to pretend to be married.

When Soap Opera Digest requests an interview, Joey enlists his friends to make sure he does not say anything that could cost him his role.

During her baby shower, Rachel realizes she is unprepared to be a mother and accepts her mother's offer to move in to help with the child.

A food critic blasts Monica's cooking in a newspaper review. A cute saleswoman riles Rachel when she flirts with Ross, and Phoebe coaches Chandler for a job interview.

Overdue Rachel tries everything to rush the delivery of her baby.

The friends cause havoc in the maternity ward as Rachel begins childbirth.

The friends cause havoc in the maternity ward as Rachel begins childbirth.

Joey finds himself engaged to Rachel soon after she delivers her baby girl, while Phoebe assumes Ross is the one who proposed.

Joey seeks forgiveness from Ross, while Rachel tries to quell Emma's incessant crying.

Emma's pediatrician drops her as a patient because of Rachel's constant calls.

The guys receive a prestigious offer to work over the summer at the North Pole, and Penny's resultant behavior leaves Leonard unsure if he should go.

Discovering Leonard, Raj and Howard fudged the results of his Arctic research expedition, a disgraced Sheldon heads home to Texas.

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

Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behavior modification experiment on Penny.

Facing a return to India, Raj needs a job desperately enough to consider working for Sheldon. Meanwhile, Howard becomes a third wheel to Leonard and Penny.

Sheldon looks forward to squaring off against an actor from the Star Trek universe he holds enmity towards in a fantasy card game tournament. Wolowitz cashes in on an old pact with Leonard to get Penny to set him up with a friend of hers.

Leonard, hoping to fit in with Penny's football-loving friends, gets tutored in the sport by Sheldon. Raj is infuriated when Wolowitz's skirt-chasing leads to the loss of his prized patang.

Will Smith stars as a technology-averse cop in a not-so-distant future who becomes convinced that a robot is responsible for a prominent scientist's murder.

Murr and Q are going on a trip down memory lane and watching extended never-been-seen-before clips from the last few years.

Rachel has a bone to pick with her self-centered sister on Thanksgiving.

Rachel impulsively gives her telephone number to a handsome guy but worries he will call when Ross is there.

Monica fears the worst when she learns Chandler will be spending Christmas in Tulsa working on a deadline with a beautiful co-worker.

Rachel crosses swords with her temporary replacement at the shop. Phoebe wreaks havoc on the set of Joey's soap opera.

Monica invites Rachel's workplace rival to her birthday party. Joey flirts with Emma's new nanny, and Phoebe and Mike take care of a litter of rats.

Leonard and Penny's first big fight sees Sheldon playing mediator due to childhood trauma that's left him with an inability to be around loud verbal conflicts.

With the rest of the gang off on a desert camping trip to view the Leonid meteor shower, Sheldon must play hero after Penny slips in the tub and dislocates her shoulder.

Barry Kripke pranks Sheldon during his spot on NPR, leaving him with a taste for vengeance. Wolowitz, pressured by Bernadette to define their relationship, gets advice from a fantasy version of Katee Sackhoff.

Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment.

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.

Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university party.

A spoiled, wealthy yacht owner is thrown overboard and becomes the target of revenge from his mistreated employee.

Sheldon helps his father coach the football team.

Sheldon is determined to prove a NASA rep wrong.

Meemaw refuses to give George Sr. her brisket recipe.

George takes his sons to see a space shuttle launch.

Sheldon tutors his brother when his grades threaten football.

A trip to Sunday school inspires Sheldon to study religions.

Monica exults in the applause she receives on karaoke night, unaware that the cheering audience can see through her blouse.

Joey and Phoebe conspire to send Rachel and Ross on disastrous blind dates.

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

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

Ross and Chandler trade barbed insults on their alma mater's Web site.

The gang buys scads of lottery tickets for the multimillion-dollar jackpot.

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 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 he wants to date.

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

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

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David prepares to propose to Phoebe, but ex-boyfriend Mike 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, and Phoebe and Mike rekindle their romance.

A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.

Stuck on the solution to a physics problem, Sheldon seeks a number of alternative approaches to change his thinking and free the mental block -- including working with Penny at The Cheesecake Factory.

When Leonard is offered a trip to Switzerland on Valentine's Day to see a particle accelerator, he must choose between taking Penny or Sheldon.

An appearance in traffic court comes at the worst possible time for Sheldon, the same day Stan Lee is appearing at the comic book store.

The guys go to a garage sale and find a ring from the Lord of the Rings films, and the rare find threatens their friendship.

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him get ready for the big night.

Sheldon gets to square off at the bowling alley against nemesis Wil Wheaton. Meanwhile, Leonard's miffed when Penny doesn't respond the way he hoped after saying "I love you."

Subsequent to Leonard and Penny's break-up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido.

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting for her the story of how he met and moved in with Sheldon.

Howard and Raj try to find the perfect match for Sheldon by setting him up on an Internet dating site. Seeing her new boyfriend interact with the gang makes it clear to Penny that she can't go back to dating dumb jocks after dating Leonard.

Howard uses a robotic arm for his own pleasure. Sheldon goes on a date with Amy Farrah Fowler, his first date ever, and Penny finds herself accompanying them.

Sheldon calculates that he'll be dead before technology exists to download his consciousness into a robot, so he goes on a binge of healthy living and ultra-safety.

Sheldon breaks up with Amy Farrah Fowler, and the guys worry when he starts replacing her with cats.

Wolowitz is embarrassed when a secret of his is revealed, and Sheldon and Raj battle at work.

After hosting the scariest haunted house in the neighborhood for years, Stan is threatened by a competitive neighbor.

Stan battles an evil hot tub bent on killing his family.

Steve and Roger discover that the house is haunted. The ghost appears as an apparition of a younger Francine. The ghost grows more powerful until it attacks Hayley's boyfriend and pulls him into the netherworld.

Steve and his friends take up witchcraft to gain power and popularity at school. Stan and Klaus become obsessed with remembering 90s bands.

When Roger breaks his ankle, Francine convinces Stan to let him play in his basketball league. Meanwhile, Steve sings a song that parodies R. Kelley's "Trapped in the Closet."

When Stan discovers a salt mine in the backyard, the Morton Salt Company wants to buy it. It turns out Steve is the rightful owner of the land and he faces pressure from the family to sell.

When Bullock is upset that somebody did not bring a gift to the CIA Secret Santa party, Stan goes on a mission to find out who it was. Meanwhile, Steve poses as the good guy boyfriend of several female classmates.

Stan and Steve start bowling together to have more quality time and Steve gets discovered for his bowling talent. Klaus holds a contest to test whether Roger or Hayley have the worse attention span.

In order to avoid being sent on a suicide mission, Stan learns how to become a DJ to beat Bullock in a DJ Battle. Jeff takes up drinking psychedelic teas and Roger helps him build an imaginary musical instrument.

The Smith family forgets to celebrate Father's Day, and so to make it up to Stan, they plan out the perfect day. Stan uses a CIA device to erase their memories and have them continually plan perfect days for him.

Sheldon interviews with a school for gifted children.

Mary and the twins move in with Meemaw after a fight.

Sheldon's germophobia lands him in detention.

Sheldon and Missy are left home alone for the first time.

Sheldon and Tam make a new friend.

Sheldon faces an unlikely bully.

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

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

An X-rated cake is delivered to Emma's first birthday party.

Rachel convinces her sister to baby-sit over Ross' protests, and Joey writes a letter to an adoption agency on Monica and Chandler's behalf.

When Ross interviews with Charlie's ex-boyfriend for a prized grant, the doctor makes a shocking stipulation.

Monica and Chandler fuss over their apartment as they expect a visit from the adoption worker. 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 labors under a misconception about Monica and Chandler's respective occupations.

Rachel and Phoebe spot Chandler getting into a vehicle with a mysterious blond woman.

Joey appears as a celebrity contestant on $100,000 Pyramid. Monica and Rachel hire an ungainly stripper 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.

Monica and Chandler show Erica the sights but also 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.

Sheldon meets Amy Farrah Fowler's mother and comes to the realization he no longer wants to see Amy, and Leonard realizes everyone is in a relationship except for him.

When Raj's sister has a one-day layover, he forbids the others from hooking up with her, unaware she and Leonard already did long ago.

The rest of the gang is interviewed by the FBI for Wolowitz's security clearance with Sheldon accidentally letting slip some damaging information.

The guys camp out in line to see a print of Raiders of the Lost Ark with 21 extra seconds and are outraged to see Wil Wheaton and his friends being allowed to skip the line. Penny and Bernadette invite Amy to their girls night.

Penny asks Leonard to lie to her visiting father, while Howard, Raj and Bernadette spend all night looking through a telescope.

Amy crushes on one of Penny's dim ex-boyfriends, Zack. Raj and Wolowitz argue over who'd be the better superhero.

The guys get Zack and Penny to join their Justice League costume for a New Year's Eve bash at the comic book store.

Their friendship becomes strained when Sheldon tries to take over Leonard's creation of a smartphone application that solves differential equations.

Howard is jealous when Bernadette runs into her old boyfriend at a science event they're attending.

Sheldon wants acting lessons from Penny, hoping they will make him a better teacher.

After meeting at a fundraising gala, an aged but wealthy Caltech donor makes Leonard ponder if he's willing to have sex with her to secure another donation.

Howard contemplates a serious decision in his relationship with Bernadette, and Leonard and Raj's sister start seeing each other again.

Sheldon is in a crisis when he realizes he's not the epicenter of the group, so he decides to find new friends.

Leonard has a tough choice to make when Priya asks him to stop spending time with Penny, forcing him to choose between the two women, and Howard keeps pestering Sheldon with a magic trick.

The guys become sleuths to find out who hacked Sheldon's online-game account.

Jason Alexander guest stars as Sheldon's drama teacher.

Sheldon declares his independence from Mary.

Wallace Shawn guest stars as Sheldon's college professor.

Sheldon faces his fear of a neighbor's dog.

Sheldon obsesses over Meemaw and Dr. Sturgis.

Sheldon interferes in Meemaw's romantic relationships.

The group loves Monica's new boyfriend. Chandler resumes smoking, and Phoebe receives a large sum of money unexpectedly.

While the men attend a hockey game and end up at a hospital, the women spy on President Clinton's top aide, George Stephanopoulos, who lives across the street. Rachel receives her first paycheck.

While Phoebe and Chandler end their respective romantic relationships, Rachel and Ross do laundry together on their first date.

Joey gets a film role as a stand-in for Al Pacino's butt. Ross tries to be less conservative. Chandler has an affair with a married woman.

A citywide power outage leaves Chandler stranded in the vestibule for an automatic banking machine with gorgeous model Jill Connick. Ross tries to ask Rachel out on a date. Joey learns Monica used to be infatuated with him.

When Ross and Monica's grandmother dies, the whole gang attends the funeral service. Chandler questions his sexual persona when a co-worker wants to arrange a date for him with another guy.

Monica intends to host a cozy Thanksgiving feast in her apartment with her friends but her plans go awry, and the feast becomes a fiasco.

The friends promise to celebrate New Year's Eve without dates but soon all their plans change. Ross gets a pet monkey.

Chandler's flamboyant mother comes to New York for a visit. Phoebe and Monica cause a traffic accident.

Rachel's Italian boyfriend tries to seduce Phoebe. Rachel accidentally reveals a secret to Ross. Monica's aunt refuses to take the lasagnas she ordered from Monica.

Chandler sees Rachel nude. Joey learns his father is having an affair.

On Valentine's Day, Ross meets his ex-wife while on his first date in nine years. The girls rebel by burning mementos of past relationships.

A restaurant owner interviews Monica for a chef's position. Ross asks Joey how to talk dirty to women.

Sheldon and Amy decide to start rumors about themselves as a social test. Meanwhile, Howard takes his relationship with Bernadette to an even higher level.

Priya uses her legal expertise to rip apart Sheldon's roommate agreement, and the women take the flustered Sheldon out dancing.

Raj makes an attempt to cure his phobia of talking to women, and Penny spies on Leonard and Priya with the help of Bernadette.

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya warming up to one another.

Raj moves in with Sheldon when Leonard and Priya's Star Trek bedroom fantasy is too much for him, and the guys tease Howard when Bernadette gets her PhD, making Howard the only one without a doctorate.

On the fifth season premiere, Penny worries that she's screwed things up permanently with her friends after her night with Raj, while Sheldon takes command of the paintball team.

Sheldon tries to spook his friends on Halloween.

Sal, Q and Murr kick off another season of antics by getting themselves stuck in a vent system and confusing customers at a bagel shop. Then, our losing Joker will face humiliation in a punishment that's tough to swallow.

The Jokers are locked in a supply closet and must decide who's endured the worst punishments to escape. As they argue over physical, embarrassing, and personal punishments, old clips resurface, and tensions rise.

Sheldon dismantles the refrigerator to stop an annoying hum and then must get a paper route to pay for the repairs.

When Dr. Sturgis bonds with Paige, another 10-year-old genius, Sheldon's jealousy leads Meemaw to intervene. Meanwhile, Mary invites Paige's family over for a play date.

When Mary's faith is shaken by a tragedy in the community, Sheldon becomes an unlikely ally.

When George Sr. asks Sheldon to keep a secret from Mary, the stress of not being honest drives Sheldon to hide out at Tam's for his first sleepover.

Dr. Sturgis recommends Sheldon and Missy for a university research study on twins, and Mary is unhappy when the test results go to Sheldon's head.

Mary clashes with Sheldon's drama teacher Mr. Lundy over plans for a Halloween haunted house fundraiser for the church. Also, Georgie falls for a rebellious teenage girl that Sheldon is tutoring.

Rachel finds out about Ross' secret love for her but another surprise awaits her.

Rachel gets an unpleasant surprise when Ross returns home. Phoebe has varied success cutting the friends' hair.

Phoebe unwittingly disgusts everybody. Joey competes with a fellow salesman.

The downstairs neighbor dies and bequeaths his strange possessions to Monica and Rachel.

Everyone is surprised when Phoebe's husband shows up.

The friends want to give Ross a birthday party but disagree about money. Monica gets promoted and learns a tough lesson.

Joey and Chandler try to attract women with baby Ben. Phoebe gets terminated from her singing job and replaced by a professional, Stephanie.

Dramatic developments occur in Ross and Rachel's relationship. Chandler regrets asking Monica to help him lose weight.

Rachel makes a painful discovery concerning Ross. Monica's new boss gives her an impossible task.

Phoebe learns the surprising truth about her father. Ross makes Monica's Christmas party guests miserable.

Joey gets a great acting opportunity. Rachel dates a guy who is amazingly similar to Ross.

Carol and Susan prepare for their wedding with some help from an uncomfortable Ross.

Ross searches for his former pet monkey. Joey dates an obsessed fan.

A battle of wills between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya (Aarti Mann).

Attending a co-worker's wedding, Leonard and Amy (Mayim Bialik) get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz!

When Raj is upset he's the only one of the four guys who's not in a relationship, Penny sets out to find the perfect date, introducing him to Emily, a girl he can actually talk to!

Sheldon and Leonard get invited to a housewarming party at Wil Wheaton's house. Howard gets an out-of-this-world opportunity!

Sheldon craves attention from his visiting mother.

Bernadette and Penny shop for wedding dresses without Amy.

Sheldon must overcome his fear of birds.

Sheldon becomes jealous when Stuart asks Amy for a date.

Leonard comes face-to-face with his high school bully.

Sheldon gets in trouble with Amy, and it's up to Penny to teach him how to be a better boyfriend. Howard, meanwhile, must come to grips with Bernadette's dislike of children.

Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two on the 100th episode of the series.

Leonard and Penny "beta test" their relationship.

Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Howard tries to pick his astronaut nickname. NASA astronaut Mike Massimino guest stars.

Storm-chasing scientists head into the heart of the most lethal tornadoes to track nature's fury in this action-packed blockbuster with Helen Hunt and Bill Paxton.

Storm-chasing scientists head into the heart of the most lethal tornadoes to track nature's fury in this action-packed blockbuster with Helen Hunt and Bill Paxton.

Sheldon gets into trouble with fellow child genius Paige at the Science Museum, while George Sr. is forced to play therapist to Paige's bickering parents, Barry and Linda. Meanwhile, Mary, Georgie and Missy help Meemaw with a garage sale.

When Meemaw gives Sheldon his first video game, it takes over their lives. Meanwhile, George Sr. gets jealous when Georgie bonds with Herschel at the auto shop.

Sheldon studies his family for a psychology project when their Thanksgiving dinner turns into a family fight after George Sr. is offered a job in Oklahoma.

Bazinga is born! When Sheldon learns that people with stunted childhoods can turn into social outcasts, he tries to act like a kid. Also, Meemaw and Dr. Sturgis's relationship is tested when she teaches him how to drive.

While Missy unknowingly becomes Sheldon's test subject, Georgie joins Mary's Bible study to spend more time with his crush, Veronica.

When Sheldon gets sick and has to spend a few days in the hospital, he turns into the world's worst patient and his behavior takes a toll on everyone. Also, Missy gets a taste of what life would be like without her twin.

Chandler wants his annoying new roommate to move out. Joey's exorbitant bills come due. The women learn from a book about personal empowerment.

Monica's boyfriend impresses Chandler and Joey. Phoebe finds out what she missed as a child.

Two bullies eject Chandler and Ross from Central Perk. Phoebe meets a brother she never knew she had.

Rachel gets a surprise at her birthday party when her parents show up.

When Phoebe catches chickenpox, her chances for romance with a former lover are almost ruined. Monica worries that she is too strange for Richard.

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills.

Sheldon tries to spook his friends on Halloween.

The gang celebrates Halloween at Stuart's comic book store. Meanwhile, Leonard and Penny discover a new spark in their relationship when he seduces her with science.

Leonard's car is stolen when the guys take a road trip to a comic book convention in Bakersfield, dressed as Star Trek characters.

While Sheldon and Howard continue their bonding, Sheldon's visit to see his mommy forces him to start addressing a new reality. The gang are subjected to a murder mystery party that leads them to speculate where they might be in 20 years.

Leonard reinstates Anything Can Happen Thursday, and it leads the regimented Sheldon to attempt something spontaneous, which creates friction among Penny, Amy and Bernadette. Raj requests help from Howard in prepping for a date with Emily.

An experiment designed to make participants fall in love piques Penny and Leonard's interest, so they decide to put it to the test. Meanwhile, Leonard, Amy, Raj and Emily have an encounter with a "zombie."

When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween Party. Leonard is shocked that Penny doesn't remember their first kiss.

Bruce Nolan is a local Eyewitness News TV reporter in Buffalo, New York, best known for doing human interest stories. Bruce is disconnected with everything in his life and rarely misses an opportunity to complain about it.

Murr and Q are going on a trip down memory lane and watching extended never-been-seen-before clips from the last few years.

Sal, Q and Murr kick off another season of antics by getting themselves stuck in a vent system and confusing customers at a bagel shop. Then, our losing Joker will face humiliation in a punishment that's tough to swallow.

The Jokers are back working as dry cleaners and TV producers, but one of them can't keep it together and must endure concertgoers who have escaped their enclosures.

The Jokers are locked in a supply closet and must decide who's endured the worst punishments to escape. As they argue over physical, embarrassing, and personal punishments, old clips resurface, and tensions rise.

The Jokers face off by recording voiceover for a fake video game and playing the concerned parent writing to their kid's school. But one Joker burns out with a punishment that's gotta sting.

Joey Fatone interviews the Jokers for a fake documentary, then the guys react to an overly emotional phone call for an underwhelming reason. One Joker checks out and is forced into being the world's worst grocery store employee in his punishment.

The Jokers hit the grocery store aisles dressed in absurd disguises, then train someone in using aggressive phone tactics for charity donations. The losing Joker must subject themselves to scientific probing into their hidden emotions.

The Jokers can't contain the laughs as they answer survey questions for a new snack food and present the world's worst pharmaceutical ads. Then, tonight's loser will work up a sweat in a punishment that's all pain, no gain.

Rachel is a bridesmaid at her ex-fianc?'s wedding. Monica and Richard's relationship is jeopardized when the subject of children is discussed.

Ross' secret fantasy doesn't stay secret for long after he confides in Rachel. Chandler resumes an old relationship.

Ross becomes frantic trying to get everyone ready to leave to hear his speech at the museum.

Monica wants to have a baby. A man is stalking Phoebe.

Chandler wants to commit to a relationship with Janice. Phoebe poses as Joey's agent.

Phoebe tries to be more friendly with her half-brother. Ross meets Isabella Rossellini.

The friends recall secrets from their pasts.

Joey sees Janice kissing her husband, whom she is divorcing while she dates Chandler. Rachel's father clashes with Ross.

Chandler and Janice make a difficult decision about their relationship. Monica accidentally injures Ben and tries to hide it from Ross.

On Thanksgiving, a good-natured football game between the friends reveals some serious rivalries.

Bruce Nolan is a local Eyewitness News TV reporter in Buffalo, New York, best known for doing human interest stories. Bruce is disconnected with everything in his life and rarely misses an opportunity to complain about it.

James Wan directs this underwater adventure in which Arthur Curry (Jason Momoa) must face his tyrannical half-brother Orm and reclaim his place as king of Atlantis to prevent an imminent war between the worlds of ocean and land.

Attention shoppers! The Jokers make mischief by taking unflattering pictures of grocery store patrons, then posing as horrible employees at the Yeti store. But tonight's loser must "meat" his fate in a jaw-dropping punishment.

Attention shoppers! The Jokers make mischief by taking unflattering pictures of grocery store patrons, then posing as horrible employees at the Yeti store. But tonight's loser must "meat" his fate in a jaw-dropping punishment.

And ACTION! The Jokers play unprofessional actors in a fake commercial, then make wild assumptions about other mallgoers. But one Joker breaks and is tasked with becoming the strictest security guard imaginable in his punishment.

The Jokers pretend to be med students in training with standardized patient actors, then play the hero and break up a public fight hoping to earn applause. Later, one Joker has to put his hips where his mouth is and settle a bet of his own making.

The Jokers are back working as dry cleaners and TV producers, but one of them can't keep it together and must endure concertgoers who have escaped their enclosures.

The Jokers face off by recording voiceover for a fake video game and playing the concerned parent writing to their kid's school. But one Joker burns out with a punishment that's gotta sting.

Joey Fatone interviews the Jokers for a fake documentary, then the guys react to an overly emotional phone call for an underwhelming reason. One Joker checks out and is forced into being the world's worst grocery store employee in his punishment.

The Jokers hit the grocery store aisles dressed in absurd disguises, then train someone in using aggressive phone tactics for charity donations. The losing Joker must subject themselves to scientific probing into their hidden emotions.

The Jokers are locked in a supply closet and must decide who's endured the worst punishments to escape. As they argue over physical, embarrassing, and personal punishments, old clips resurface, and tensions rise.

Murr and Q are going on a trip down memory lane and watching extended never-been-seen-before clips from the last few years.

Sal, Q and Murr are crashing (and burning) into product displays and hiding in tight spaces, but one of them must face the music with our celebrity guest Bret Michaels.

Rachel wonders if she'll ever get another job after she quits Central Perk. Joey's new job selling Christmas trees upsets Phoebe. Ross breaks a little girl's leg.

Rachel meets a handsome stranger, who might help her career. Chandler gets into trouble with Joey's sisters.

Ross overreacts when Rachel starts working with a handsome guy. Monica becomes enamored with a sexy busboy.

James Wan directs this underwater adventure in which Arthur Curry (Jason Momoa) must face his tyrannical half-brother Orm and reclaim his place as king of Atlantis to prevent an imminent war between the worlds of ocean and land.

When Sheldon is forced to take a vacation by the university, he goes to work with Amy in her neurobiology lab.

When a corner office at the University opens up, Sheldon must compete for it with his office nemesis, Barry Kripke. Meanwhile, Penny receives an unusual gift from Amy.

A change in Sheldon's routine forces him to re-evaluate his entire life, when his barber is sick. Meanwhile, Howard rethinks his decision to go into space after astronaut training.

Sheldon chooses to participate in a guys-only weekend Star Wars gaming marathon rather than go with Amy to her aunt's birthday party -- and gets a lesson from Penny and Amy.

It's a dream come true for Sheldon when he has a close encounter with his hero, Mr. Spock -- legendary sci-fi icon Leonard Nimoy.

Sheldon has a chance to meet his hero, Stephen Hawking.

Howard's wedding plans are in jeopardy after the guys (and Wil Wheaton) throw him a bachelor party and details of his sexual history are leaked online.

Newscaster Evan Baxter wins a seat in Congress. Moving his wife (Lauren Graham) and family to northern Virginia, he seems to have it made, then God (Morgan Freeman) throws a crisis of biblical proportions at his feet.

While Sheldon attempts to build a nuclear reactor to power the neighborhood, Georgie is heartbroken when he learns that Veronica has a boyfriend. Also, a university party gets heated when Dr. Linkletter flirts with Meemaw.

Sheldon uses his new friendship with the school bully to boss Georgie around. Also, Missy steals Meemaw's makeup for Picture Day.

Sheldon and Dr. Sturgis have their first fight when Dr. Sturgis marks a question wrong on Sheldon's test. Mary takes over for Pastor Jeff when he's out sick.

Things spiral out of control when Sheldon boycotts his favorite bread company and ends up on the local news. Meanwhile, Georgie offers Veronica a shoulder to cry on when she's dumped by her boyfriend.

Inspired by his hero, Albert Einstein, Sheldon tries his hand at the violin. Also, Mary and Meemaw secretly buy a pregnancy test when Mary thinks she's pregnant.

Sheldon moves in with Dr. Sturgis for the weekend to see what his life would be like in college. Also, a lonely Mary tries to bond with the other Coopers during Sheldon's absence.

When Monica and Richard accidentally meet, they decide to become friends with dire consequences.

Phoebe's ex-singing partner wants to make Phoebe's signature song, Smelly Cat, a commercial success. Chandler dates a woman with a handicap.

Phoebe becomes involved with a foreign diplomat. Ross becomes involved with another woman after a fight with Rachel.

Ross wakes up with Chloe but an oblivious Rachel wants to resume their relationship.

Ross and Rachel remain apart while their friends feel forced to choose between them.

Phoebe is distraught when her brother wants to marry a woman twice his age. While working as a waitress, Monica gets a tip from an admirer worth a small fortune. A hypnosis tape makes Chandler act like a woman.

Ross is upset when Rachel returns his personal belongings and dates Mark. Monica dates a millionaire.

Joey thinks he's found his true love. Rachel's boss dates Chandler, creating big trouble for Rachel. Monica inherits a dollhouse.

When Pete buys a restaurant, Monica must make a difficult decision. Ross makes a sacrifice for Rachel. Joey buys Chandler an unusual pet.

Ross tries to convince Rachel that her date is psychotic. Joey's play gets terrible reviews.

Ross finds a strange growth on his buttocks. Phoebe can't choose between two guys. Monica's boyfriend surprises her.

Monica's boyfriend cannot stop fighting. Chandler's boss is overly friendly.

The friends stay at a beach house. Phoebe meets someone who knows details about her family. Rachel expresses her jealousy of Ross' uninhibited girlfriend.

When NASA reschedules Howard's mission and puts his wedding plans in jeopardy, he's forced to face his fears and Bernadette's dad (Casey Sander).

When Howard and Bernadette decide they want to be married before his NASA space launch, the gang rushes to put on a wedding, on the fifth season finale.

On the sixth season premiere, Howard discovers that he can't escape his mother -- even in space! Back on earth, meanwhile, Raj turns his existence as a third wheel into an art form.

When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, Howard is being picked on in space by the other astronauts.

Amy's nervous when Sheldon hires Alex, a female assistant.

Howard returns from space -- without the welcome he wanted.

The gang celebrates Halloween at Stuart's comic book store. Meanwhile, Leonard and Penny discover a new spark in their relationship when he seduces her with science.

Sheldon's friendship with renowned scientist Stephen Hawking is threatened by a game of "Words with Friends," while Penny secretly enrolls in a class at the local college.

Bernadette pressures Howard to move out of his mother's house, while Sheldon finds himself caught in the middle of a fight between Amy and Wil Wheaton.

Howard and Raj try to solve a mystery about Sheldon.

Sheldon and Howard battle over an assigned parking spot.

Howard bonds with his father-n-law on a fishing trip.

Sheldon unwillingly revisits some Christmas memories during a lively game of Dungeons and Dragons, while Raj joins the girls for ladies night out.

Sheldon is accused of sexual harassment at the University and winds up dragging Leonard, Raj and Howard into the fray.

Leonard's car is stolen when the guys take a road trip to a comic book convention in Bakersfield, dressed as Star Trek characters.

Stan goes over-the-top to produce a reenactment of Charles Lindbergh's solo flight for Steve's school project after he gets an F. Klaus buys a pair of shoes online and Hayley helps him harass the neighbor they believe has stolen them.

Hayley takes Roger with her to a meditation center and he quickly takes over, becoming one of the world's leading authorities on meditation. Stan and Steve become apprentices as they are taught the art of making sushi.

Stan is embarrassed when a painting of Francine's genitals, done by a famous artist, is unveiled at the museum. Steve turns to helping people after masturbation is ruined by his mom's portrait.

Stan is upset at the idea of becoming a grandfather after Hayley and Jeff announce they're trying to have a baby. Steve and Klaus join a drug gang after Steve decides to take being an uncle extra seriously.

Hayley experiences what pregnancy would be like after Roger agrees to give birth to Jeff so he can be human again. Snot's feelings are hurt when Steve secretly signs him up for a makeover.

The Smith family must rescue Steve after he is kidnapped and taken to the North Pole. There, Santa Claus is using children to mine for precious stones that he needs to perform an ancient ritual.

Francine becomes less attracted to Stan when he gets involved with slot car racing. Roger becomes a stewardess to perform comedy routines on the plane but is upset when another stewardess is funnier than him.

Steve and his friends take up witchcraft to gain power and popularity at school. Stan and Klaus become obsessed with remembering 90s bands.

Klaus gets transferred into the navigation system of Stan's car after Stan refuses to pay for a life-saving surgery. Steve and his friends prank Roger's Frank character and he terrorizes them for revenge.

Francine steals from the CIA and pretends to be a sexy supervillain to incite Stan to be more seductive. Roger tricks Hayley and Steve into trapping Jay Leno so he can take revenge on him.

Unhappy that school funds are going toward football rather than academics, Sheldon decides to run for class president.

Georgie is thrilled when Veronica stays at the Coopers' for a few days. Meanwhile, Meemaw and Dr. Sturgis celebrate their one-year anniversary.

The Coopers help a brokenhearted Pastor Jeff through a rough patch in his marriage. Meanwhile, Sheldon pressures church members for donations when Mary takes him to work for a day.

Sheldon invites the entire school to a party for the Nobel Prize announcements. Meanwhile, Meemaw learns more about Dr. Sturgis's past, and Georgie's desire for cable TV leads to a standoff between him and his dad.

Mary worries about Sheldon's mental health.

Sheldon takes his education into his own hands.

Ross loves dating Rachel again but hates what he did to accomplish the reconciliation. Phoebe gets to know her mother.

Phoebe thinks her adoptive mother's spirit inhabits a stray cat. Joey's attempt to sell his entertainment center proves hazardous.

Monica tries to prove her mother wrong. Chandler gets into an embarrassing situation while dating Rachel's boss.

Joey makes an odd deal with the building superintendent to prevent him from evicting Rachel and Monica. Phoebe wants to date her sexy massage client.

Joey thinks Chandler hates Joey's new girlfriend -- but the truth could be even more upsetting. Ross and Rachel try to make each other jealous.

Ross' beautiful new girlfriend has a disgusting secret. Chandler becomes more familiar with Joey's girlfriend.

Chandler is guilt-ridden after kissing Joey's girlfriend. Ross' musical talents are not as amazing as he and Phoebe think.

On Thanksgiving, Joey wants to punish Chandler for kissing Kathy. Monica gets a surprise when she visits an eye doctor.

The guys try to be spontaneous and wild. After Monica gives a bad restaurant review, she receives a new career opportunity. Rachel's boss offers her a promotion.

Ross struggles to maintain a long-distance relationship. Chandler tries to get a date for Rachel. Monica schemes to establish authority at her new restaurant job.

Phoebe's half-brother makes an astounding announcement and a thought-provoking request. Joey finds himself in a class struggle.

Phoebe finds out whether she is pregnant or not. A simple challenge escalates into a full-blown contest between the guys and the women.

Rachel schemes to get a handsome client to ask her on a date. Chandler's jealousy causes problems with his girlfriend.

Outraged that he's being forced to work with his university nemesis, Barry Kripke (John Ross Bowie), Sheldon faces a crisis of conscience.

When Sheldon and Leonard fight, it affects Penny and Amy's living arrangements. Meanwhile, Raj takes care of Mrs. Wolowitz while Howard is away.

Sheldon struggles to find a Valentine's gift for Amy.

Raj vows never to leave his apartment after a horrible date.

Leonard, Sheldon and Howard try to advance the cause of women in science by speaking with junior high girls about their future careers, while Raj plans his date with Lucy.

To open or not to open? When Howard finds a letter from his father, he's forced to confront his past. And Leonard and Penny throw a grown-up cocktail party at the apartment.

Leonard, Sheldon and Raj fight for tenure at the University.

After one of his favorite TV shows gets canceled too soon, Sheldon feels lost, so Amy tries to help him get over his compulsive need for closure by retraining his brain.

Leonard and Sheldon hire Professor Proton (Bob Newhart), the host of their favorite childhood TV show to perform. Raj leaves his dog with Howard and Bernadette.

$25,000 is up for grabs for our individual competitors tonight! Who will triumph with no one to rely on but themselves? Will it be Sergeant Stripper, the Swallower, the Cruise Director or Dances with Whales?

Sheldon leaves town after a fight with Meemaw and his parents.

On a science break, Sheldon discovers The Lord of the Rings.

Dr. Sturgis returns from the mental hospital.

Missy tries out for the baseball team.

Sheldon starts the first internet flame war.

The university tries to recruit Sheldon, through George.

Charlton Heston finds Joey in a compromising position during a movie shoot. Rachel regrets asking Ross for a favor.

Chandler's annoying former girlfriend reappears. Ross plays rugby to impress Emily with painful results.

Trying to become better acquainted with her sexy client, Rachel inadvertently thwarts Ross' plans for a romantic evening with his girlfriend.

Monica helps Ross tell his girlfriend that he loves her. Phoebe gets some surprising news about her pregnancy.

Ross and his ex-wife become jealous when their lovers go to England together. Rachel's plans to seduce her boyfriend go awry.

Drastic changes occur in Ross' relationship with Emily. Monica and Rachel will do anything to get their old apartment back from the guys.

Rachel reacts drastically to Ross' engagement. Chandler becomes exasperated by Joey's snoring.

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

Joey loses Ross' treasured wedding ring. Phoebe has extreme mood variations from her pregnancy.

Rachel stays home while the others go to England for Ross' wedding.

Rachel frantically tries to get to London before Ross marries Emily. Ross' father clashes with Emily's.

Will Emily forgive Ross before their honeymoon? Monica and Chandler agree to end their new relationship.

Ross' new wife won't speak to him. Rachel appoints Monica her advisor in romance. Phoebe feels neglected.

When the girls' trip to Vegas falls through, the guys invite them to a Dungeons & Dragons date night that causes Sheldon and Amy's relationship to take an unexpected turn.

On the sixth season finale, Sheldon and Penny are thrown for a loop when Leonard is offered an exciting new job opportunity overseas.

Leonard is away at sea, so Sheldon and Penny spend time together and spill some revealing secrets. Meanwhile, Howard comes to Raj's aid after his breakup with his girlfriend.

Leonard returns from the North Sea expedition and finds things chilly between him and Sheldon, while Howard's relationship with his mother opens the door to questions about his masculinity.

Raj puts together a scavenger hunt that turns into serious, cutthroat competition among the gang.

Sheldon is fit to be tied when Amy ruins one of his favorite adventure films, while Leonard finds the key to getting Penny to do his bidding, and Raj and Stuart get creative with their online-dating profiles.

Amy takes a job at Sheldon's university, putting their relationship to the test.

$25,000 is up for grabs for our individual competitors tonight! Who will triumph with no one to rely on but themselves? Will it be Sergeant Stripper, the Swallower, the Cruise Director or Dances with Whales?

In this week's episode, the Jokers are giving unsolicited etiquette advice and live taping strange product reviews shortly after. Then, one lucky Joker will be taking all the blame for our celebrity guest, Post Malone!

From working remotely to pitching unconventional business ideas with Steve Byrne, one Joker has a shot at winning a pair of highly sought-after sneakers thanks to NBA star, Anthony Davis!

Sheldon faces his fear of the swimming pool.

Mary plans Pastor Jeff's wedding.

Sheldon catches Paige shoplifting.

George and Georgie go camping with Meemaw's boyfriends.

Sheldon and Georgie bond over a money-making opportunity.

While Phoebe delivers triplets, Joey experiences his own pain. Monica plans a date with a male nurse to spite Chandler.

Joey challenges Phoebe to perform a completely selfless act. Monica gets upset when Chandler gloats about sex. Ross might finally reconcile with Emily but he must make a tough decision.

Ross tells Rachel that he cannot be around her once Emily comes to New York. Chandler and Monica try to have a romantic weekend.

Will Ross obey Emily and move away from his friends? Monica and Rachel meet a monster.

Joey and Chandler regret letting Ross move in with them. Rachel schemes to get her new neighbor to ask her on a date.

The friends find out about Monica's worst Thanksgiving ever.

Joey becomes exasperated from hiding Chandler and Monica's secret. Ross gets in trouble when he expresses his rage.

A bored Ross creates havoc in Joey and Chandler's lives. Rachel is disturbed by her date's inappropriate relationship with his sister.

On New Year's Eve, the friends make resolutions for the coming year but keeping them proves difficult.

Chandler's behavior toward his boss annoys Monica. Ross' latest romance astounds everyone.

Phoebe meets another long-lost relative. Joey wears a shoulder bag.

Chandler and Monica's relationship becomes less of a secret. Ross must prove to his boss that he's sane in order to return to work.

Chandler thinks Monica wants more from their relationship. Ross fails to impress his new neighbors.

Sheldon makes a major scientific breakthrough, but he feels it may haunt him for the rest of his career. Meanwhile, Howard makes a grand romantic gesture to Bernadette, which causes Penny to put more effort into her relationship with Leonard.

When Sheldon's childhood hero, Professor Proton, seeks Leonard's help with an experiment, the slighted Sheldon goes nuclear and decides to get revenge by befriending another TV science guy.

Leonard fails to stop Sheldon from overreacting after a past slight comes to light, and as punishment Leonard must walk a mile in Sheldon's shoes. Meanwhile, Penny has a run-in with Raj's former girlfriend Lucy.

Howard's mother has a say when he and Bernadette host Thanksgiving dinner for the gang.

When Sheldon's accidental scientific discovery is disproved, Amy and Leonard try to help him deal with the shame and the disappointment. Meanwhile, Howard and Bernadette open their home to Raj for a week.

With Sheldon in Texas, the gang gathers to decorate for Christmas, and they each contemplate if they would have had a wonderful life had they never met him.

Penny turns to Leonard for comfort after her guest appearance on NCIS does not turn out well. She ends up putting Leonard on the spot regarding their relationship. Sheldon works on his sense of humor, and Raj practices talking to girls.

There's impactful news on the work front as Penny makes a big step toward pursuing a full-time acting career, and Sheldon is forced to take a vacation.

Unable to score tickets for Comic-Con, Sheldon decides to stage his own comic-book convention, while the ladies attempt to act like grown ups.

Amy has amour on her mind when she talks Sheldon into a romantic Valentine's Day getaway to Napa Valley wine country. Back at home, Leonard and Penny make an emergency visit to the vet with Raj's dog.

Leonard's purchase of a dining-room table for the apartment doesn't sit well with Sheldon, so much so that it forces him to reevaluate his life. Meanwhile, Bernadette isn't quite over the moon about Howard taking another trip to space.

Things turn rocky between Sheldon and Wolowitz after a barrage of insults, and Bernadette steps in to mediate a peace. Meanwhile, Penny is offered a movie role that may prove embarrassing.

While Sheldon and Howard continue their bonding, Sheldon's visit to see his mommy forces him to start addressing a new reality. The gang are subjected to a murder mystery party that leads them to speculate where they might be in 20 years.

$25,000 is up for grabs for our individual competitors tonight! Who will triumph with no one to rely on but themselves? Will it be Sergeant Stripper, the Swallower, the Cruise Director or Dances with Whales?