While college orientation does not go as Sheldon planned, Mary is mistaken for a university student and invited to a party.

Sheldon's first day of college is derailed by his new philosophy teacher. Also, Mary and Brenda live vicariously through Missy's first day of middle school.

Meemaw takes matters into her own hands when Sheldon's philosophy teacher, Professor Ericson, sends him into a tailspin.

Sheldon and his dad dine with President Hagemeyer and a university benefactor. Also, Dale and his ex-wife invite Meemaw to their son's wedding.

Dr. Linkletter pushes Sheldon to make friends with his fellow students, and Georgie gets a pager.

Sheldon, Dr. Linkletter and Meemaw team up on a science experiment. Also, Mary is jealous that Pastor Jeff and Brenda are spending so much time together.

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.

An online troll rips Leonard and Sheldon's published physics paper, so the guys rally to defend the two and expose the bully, while a girls night out leads to Penny, Amy and Bernadette dishing about embarrassing past events.

Amid the excitement of Stuart reopening his comic-book store, Howard gets some unsettling news; and after teaching Sheldon how to "let it go," Penny doesn't practice what she preaches when she learns something maddening about Amy.

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."

There's trouble in paradise when Amy discovers Sheldon signed up for a one-way mission to colonize Mars, and the two get into a dogfight at a pet store. Meanwhile, Leonard makes a very "adult" purchase for Penny.

An electrical short thaws the last meal that was cooked by Mrs. Wolowitz, and the gang ponders what to do with it, while Sheldon and Leonard's work is featured in a magazine, but only one receives credit.

A speaking engagement at UC Berkeley puts Leonard and Sheldon in a galaxy not too far, far away from their idol George Lucas' Skywalker Ranch, and they considrer dropping by.

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

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.

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

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.

In the Season 8 finale, Leonard and Penny are pressured to set a wedding date by Sheldon, whose relationship with Amy has taken an interesting turn.

Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Raj "breaks up" with Howard after realizing his best friend is actually hurting his confidence.

In the Season 11 finale, when Amy's parents and Sheldon's family arrive for the wedding, everybody is focused on making sure all goes according to plan -- everyone except the bride and groom.

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.

An award-winning model and her MMA fighter husband take on the world in tonight's episode. Can they go the distance against a pair of noisy lovers, early retirees and the most fabulous 40-year-olds on the planet?

Sheldon campaigns to become Dr. Linkletter's lab assistant. Meanwhile, Georgie enlists the help of Mr. Lundy, the drama teacher, for a surprising business venture.

Sheldon refuses to ride in a car after getting into an accident with Meemaw. Meanwhile, Meemaw is forced to take the church shuttle while her car is in the shop.

When the IRS accuses Sheldon of making a mistake, he stops at nothing to prove them wrong. Then, when Dale is forced to get a colonoscopy, he tries to convince Meemaw to join him.

Sheldon faces extreme consequences after installing a pirated computer game. Meanwhile, Mary and Meemaw take Brenda out for Girls Night, while George watches Billy.

Sheldon finds himself at odds with Paige once again when she considers enrolling at East Texas Tech. Meanwhile, Mary seeks the advice of June when looking for a change.

The Coopers discuss the possibilities of black holes and alternate universes when Dr. Sturgis comes over for dinner.

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

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.

When Sheldon and Amy build a fort, they come to a crossroad in their relationship. Wolowitz is shocked when a man claiming to be his half-brother shows up. When Penny is invited to be on Wil's podcast, she and Leonard have an argument.

In the event of alien contact, NASA asks Raj to craft a message for the extraterrestrials, and the guys battle over how it should be handled. Meanwhile, Penny must decide between auditioning for a film role or keeping her job in pharmaceutical sales.

Wolowitz questions his abilities when he and Sheldon can't get a drone to fly. A canceled flight nearly prevents Leonard from giving the commencement address. Raj pits his parents against each other when his father cuts him off financially.

Leonard and Sheldon's mothers come to town to celebrate their sons getting an award, but the opinionated women engage in an altercation over religion.

In the Season 8 finale, Leonard and Penny are pressured to set a wedding date by Sheldon, whose relationship with Amy has taken an interesting turn.

Season 9 premiere, Penny has a problem dealing with Leonard's confession about having kissed another woman, while Sheldon is confused about Amy calling a timeout on their relationship.

To ease Penny's mind, Leonard pays a visit to the woman he kissed during his expedition to the North Sea, while Sheldon's breakup with Amy leads him to retaliate by shooting a special episode of "Fun with Flags".

The guys surprise Leonard with a belated bachelor-party weekend in Mexico, but their plans hit a bump in the road when they get a flat tire on the way. Meanwhile, the girls lean on Penny to tell her family that she and Leonard eloped.

Two terminally ill men leave their hospital ward and set out to complete a list of things they want to do before they die.

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.

An award-winning model and her MMA fighter husband take on the world in tonight's episode. Can they go the distance against a pair of noisy lovers, early retirees and the most fabulous 40-year-olds on the planet?

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.

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.

The Grinch is irritated at the thought of the nearby village having a happy time celebrating Christmas. So, disguised as Santa Claus -- with his dog Max made to look like a reindeer -- he raids the village to steal all the Christmas things.

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.

Based on a true story, a group of steroid-abusing bodybuilders engage in a campaign of kidnapping, extortion and murder in Florida.

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.

Injured Joey must get an acting part in order to qualify for health insurance. Rachel finally learns the truth about her marriage to Ross.

Rachel forces Ross to terminate their marriage. Phoebe's first triplet baby-sitting experience proves stressful. Joey pretends to own a sports car.

The guys and the women prepare for big changes in their living arrangements.

Chandler learns how obsessively neat Monica is when he attempts to do her a favor. Joey desperately tries not to flirt with his sexy new roommate.

The guys explore their femininity. Phoebe causes trouble when she kisses someone at Rachel's work.

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.

The Grinch is irritated at the thought of the nearby village having a happy time celebrating Christmas. So, disguised as Santa Claus -- with his dog Max made to look like a reindeer -- he raids the village to steal all the Christmas things.

The Grinch is irritated at the thought of the nearby village having a happy time celebrating Christmas. So, disguised as Santa Claus -- with his dog Max made to look like a reindeer -- he raids the village to steal all the Christmas things.

Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.

After a marital disagreement, Penny takes off for a spa weekend with Amy, and Sheldon steps in to play peacemaker for the squabbling newlyweds. Meanwhile, Howard and Raj do battle with a noisy floor in the baby's room.

Sheldon decides to test an MIT invention that can help read people's emotions. Meanwhile, Leonard has trouble hiding his emotions when Penny announces her brother is going to visit, and Raj gathers former girlfriends to ask for their dating advice.

With Sheldon hindering progress on the guidance-system project, Leonard and Howard figure the only way they can get back on track is to engineer a distraction by getting him tickets to a historic railroad.

Amy is incensed when she discovers Sheldon has shared intimate relationship information with people at the University, and Raj is knocked for a loop when his father stops sending financial support.

Without financial backing from his father, Raj finds himself in a cash crunch and turns to Sheldon to help him get his head above water. Meanwhile, Penny considers crashing the guys' annual Comic-Con getaway.

A 70-year-old widower has discovered that retirement isn't all it's cracked up to be. Seizing an opportunity to get back in the game, he becomes a senior intern at an online fashion site, founded and run by a woman of high power.

Justin Timberlake and Mila Kunis star in this enticing romantic comedy about a couple of friends challenging the clichés of love.

In the fourth season finale, Missy's first heartbreak triggers a series of events that lead the Cooper family to the brink.

In the fifth season premiere episode, Sheldon and Missy both run away from home, while Mary gets some upsetting news about her husband, George.

Sheldon encourages Missy to question the Bible. Also, Meemaw is determined to catch George Sr. in a lie, and Mary helps Pastor Jeff search for a youth pastor.

While Sheldon tries to convince Dr. Sturgis to return to the university, Georgie upsets the family when he makes a life-changing decision.

While Meemaw opens a secret gambling room, Sheldon, Missy and Georgie adapt to new living arrangements.

While Mary's away, George finds himself giving advice on Missy's love life. And Georgie has a solution for Meemaw's business woes.

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.

Elizabeth and Ross decide to hide their relationship from her father and head up to his cabin for the weekend.

Sheldon reverts back to 2003 when he learns that Leonard and Penny are moving in together. Meanwhile Howard and Raj form a band to play at the comic book store.

When Barry Kripke gives the guys fencing lessons, he makes a point of letting Sheldon know he's interested in dating Amy. Stuart has trouble getting female customers at the Comic Book Store, so Penny, Amy and Bernadette stop by to help out.

A helium shortage leads Sheldon and Leonard to do business with a dealer in the black market in order to acquire some of the element for an experiment they need to complete.

Sheldon's interview for a "Star Trek" documentary focusing on Spock turns up a shocking revelation about his breakup with Amy. Meanwhile, the Wolowitzes haggle over the remodeling of his family home.

When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy. Meanwhile, Sheldon recruits Raj and Howard to find a woman for him.

Now just friends, Sheldon and Amy spend Thanksgiving at the aquarium, a reluctant Wolowitz volunteers at a soup kitchen with Bernadette, Raj and Emily, and Penny realizes that Leonard knows a bit more about her than he's let on.

God only knows what song is constantly playing in Sheldon's head, but it reminds him of Amy and leads to a surprising revelation. Meanwhile, she is back in the dating game.

Professor Proton visits Sheldon in a dream and gives him Obi-Wan Kenobi-like advice about whether to go see the new "Star Wars" film or spend the time with newly reunited girlfriend Amy on her birthday.

Penny entices Leonard to meet with a psychiatrist and the results are surprising, Stuart moves out of the Wolowitz house, and Howard and Bernadette find themselves at a loss.

Dealing with an under-the-weather Sheldon is so draining for Penny, Leonard, and the gang, that they decide to treat themselves to a Sheldon-less weekend.

Sheldon's grandmother, aka Meemaw, visits and there's friction between her and Amy, which intensifies after the elderly woman blurts out a secret about Sheldon.

Sheldon and Amy celebrate Valentine's Day with an episode of Fun With Flags, Leonard and Penny feel the pangs of aging, and Howard and Bernadette are surprised by what they find in their hot tub.

Francine dresses up in a man suit so she can spend more time with Stan; Steve forms a boy band with his friends.

Stan invites his mom to come live with him after Stan's stepfather dies. Tensions rise when Roger is forced to share his attic with her. Steve and his friends discover a plane crash and come across a long-lost script of a movie.

After concluding that Snot isn't cool enough to hang out with Steve, Stan concocts a scheme to separate the pair by sticking Snot in the Witness Protection Program; Roger gives Steve money to clean out his attic.

The Smith's babysitter breaks her leg in a soccer match so Stan and Francine are forced to leave Steve with Hayley despite her record of being irresponsible. When Hayley teases Steve, he is determined to prove her wrong and sneaks out.

A Langley Falls talk show outs Francine as a toddler rescued from a well by a fireman. On the anniversary of her rescue, she falls down the well again and makes a discovery. Stan and Roger think of the world's next business opportunity.

Francine asks her family to give up their vices for Lent or risk losing a finger.

Francine asks her family to give up their vices for Lent or risk losing a finger.

Francine tries to teach Roger the value of hard work after he fakes a masters degree and buys an Oscar. Steve interviews Stan for a personal history assignment at school.

A secret is revealed about the Smith family's past when Francine invites Stan's incarcerated dad to Stan's birthday party. Roger plays a maid, who nurses Bullock and Hayley's love child.

An award-winning model and her MMA fighter husband take on the world in tonight's episode. Can they go the distance against a pair of noisy lovers, early retirees and the most fabulous 40-year-olds on the planet?

Missy asks some uncomfortable questions about sex in church.

Sheldon takes his first engineering class with Professor Boucher. Also, Meemaw and Dale help take care of his ex-wife, June.

While Sheldon battles the mysterious Grand Chancellor of the university over science requirements, Mary discovers that Georgie is working at Meemaw's illegal gambling room.

While George Sr. plays handyman at Brenda Sparks' house, Sheldon gets the science yips and has to learn how not to think.

Sheldon gets a dorm room all to himself, which soon becomes the campus hotspot. Meanwhile, Meemaw gets an unwanted business partner.

Sheldon acts as Mary's spy when he's forced to spend the night at church for a youth lock-in. Meanwhile, Georgie finds himself attracted to an older woman.

Phoebe helps Chandler pick out an engagement ring for Monica.

Chandler plans to propose to Monica.

Monica asks Chandler to be her husband.

Monica excitedly reveals her good news to everyone but Rachel and Ross upstage her. Chandler has trouble making love.

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.

The gang learns Bernadette is pregnant and celebrates by singing karaoke. Meanwhile, Wolowitz freaks out over the pregnancy announcement and becomes convinced he must make more money to provide for the baby.

Sheldon and the gang celebrate his birthday and he's surprised by a special guest.

Howard reconsiders entering into a legal partnership with Leonard and Sheldon regarding the patent for the infinite persistence gyroscope. Also, the women offer Raj dating advice after Emily reaches out to him following their breakup.

Sheldon shocks Amy with a startling revelation after she buys him a new laptop. Meanwhile, Raj throws Leonard and Howard under the bus after they lie to their wives and sneak off to an early screening of a movie.

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Raj goes all out with pregnancy gifts.

During a group get-together, a minor argument between Sheldon and Leonard turns into a heated debate, leaving the rest of the gang to choose sides.

Sheldon attends his first comic book convention, and Mary tries selling make-up.

Sheldon makes friends with his dorm neighbors. Meanwhile, George Sr. learns his job is in jeopardy.

When a new scientist joins the lab, Sheldon is the odd man out. Meanwhile, Mary is given a lotto ticket.

Sheldon joins Dr. Linkletter and Dr. Sturgis on a science road trip, which lands them in the middle of nowhere. Meanwhile, Georgie continues to lie about his age.

When Meemaw's gambling room is a success, she finds herself with a suitcase of illegal cash. Meanwhile, Missy starts a business and Sheldon dips his toe in the stock market.

In the 100th episode, Sheldon gets an odd request from an old friend, while George and Mary are caught in the middle of Meemaw and Dale's breakup, and Georgie comes clean to Mandy.

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.

Joey's character on a daytime drama becomes more prominent to the chagrin of the show's diva star. Phoebe and Rachel argue over who should return a sexy man's misplaced cell phone to him.

Chandler finds out who Monica really wanted to have sex with on the night they became lovers. Ross is furious after Rachel teaches Ben practical jokes.

Monica battles another shopper for the perfect wedding dress. Ross and Joey compete for the same woman.

Joey overreacts at a daytime drama awards show.

Monica's gorgeous cousin unwittingly wreaks havoc on Chandler and Ross. Rachel and Phoebe hastily plan a surprise bridal party for Monica.

Rachel reveals a titillating secret about her and a former sorority sister. Ross and Chandler compete for wedding tuxedos.

As Monica and Chandler prepare their wedding vows, they and their friends reminisce.

Sheldon stays behind to spend quality time with the pregnant Bernadette when the rest of the gang toddles off to a wine-tasting event where they run into Penny's former boyfriend, and Raj introduces his new girlfriend.

When Sheldon decides he'd rather go to a movie screening than hang out with Amy, he hires Stuart to spend the day with her. Meanwhile Leonard's mother visits, and Penny just can't seem to connect with her.

In the Season 9 finale, Leonard's recently divorced parents roll into town, as does Sheldon's holy-roller mother, and all hell breaks loose.

In the Season 10 premiere, the gang deals with the awkward aftermath of an overnight liaison between Sheldon's mother and Leonard's father. Meanwhile, Penny's dysfunctional family is in town for the wedding.

The guys heads are in a spin when an Air Force bigwig approaches them about their revolutionary gyroscope invention, and Bernadette is upset with Penny after she accidentally leaks a secret to the mom-to-be's coworkers about her being pregnant.

Howard and Leonard are putting in late nights at work and Sheldon is having trouble keeping up, Raj and a pregnant Bernadette spend a day together, and Penny and Amy take in a faculty party.

Sheldon and Amy decide to move in together when her apartment floods. Meanwhile, Howard and Bernadette become upset when Raj learns the gender of their baby before they do.

Amy and Sheldon's live-in relationship may be in the toilet after he accuses her of not following the bathroom schedule. Meanwhile, Howard and Bernadette's secret staycation is interrupted by interfering interlopers who are sneaking into their hot tub.

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

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

Despite the whole family trying to keep it a secret, Sheldon and Missy learn about Georgie's pregnancy.

With the Coopers facing judgement from the congregation in the wake of Georgie's pregnancy, Sheldon is distracted by the family drama, while Missy stands up for her brother.

Sheldon struggles with the first signs of puberty while his parents both hunt for new jobs, and Georgie and Meemaw take a business trip across the border.

George Sr. bails Meemaw and Georgie out of jail. Also, Sheldon and Missy meet Mandy, and Mary feels unwelcome at church.

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.

Feeling his fetal offspring kick sends Howard on a baby-items buying binge with Raj, Sheldon and Amy host a brunch in their new digs, and Penny, by virtue of her virtuoso performance in "Serial Apist," is invited to a sci-fi convention.

In order to remain Sheldon's roomie, Amy fibs about repairs being made to her apartment. Later, they present a episode of "Fun with Flags" in Penny's apartment.

A successful gene experiment leaves Sheldon excited to procreate with Amy, and he pulls out all stops to get her on board. Meanwhile, Raj is reluctant to reveal what the new woman in his life does for a living.

A geologist coworker's MacArthur Genius fellowship award leaves Sheldon stone cold jealous. Meanwhile, Howard stumbles upon a remote-control Stephen Hawking action figure that he invented. Hawking appears as himself.

A great divide develops between Sheldon and Leonard when it comes time to divvy up their shared belongings. Meanwhile, with Bernadette heading into her pregnancy homestretch, Raj and Stuart battle to be the one providing her the most help.

The Wolowitz baby arrives, while Sheldon and Amy celebrate Amy's birthday.

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

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.

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

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.

On Christmas Eve, Amy plans a traditional Victorian dinner, while Raj, Leonard and Howard scramble to remove a pigeon that flew into the clean room at the university.

Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.

The Grinch is irritated at the thought of the nearby village having a happy time celebrating Christmas. So, disguised as Santa Claus -- with his dog Max made to look like a reindeer -- he raids the village to steal all the Christmas things.

The Grinch is irritated at the thought of the nearby village having a happy time celebrating Christmas. So, disguised as Santa Claus -- with his dog Max made to look like a reindeer -- he raids the village to steal all the Christmas things.

Lego Batman discovers there are big changes brewing in Gotham. If he wants to save the city from the Joker's hostile takeover, Batman may have to drop the lone vigilante thing, try to work with others and maybe learn to lighten up.

Sheldon and Missy try to help the family's finances. Also, Mary struggles to find her footing without the church.

Sheldon must choose sides in an ethical dilemma. Mary tries her hand at writing. Mandy needs a new place to live.

Sheldon makes a terrifying mathematical discovery while tutoring Billy. Also, Mary is jealous of Missy's relationship with Mandy and MeeMaw.

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.

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

Ross' new girlfriend orders Christmas cards with a photo of them on the cover.

Rachel joins Joey for a night out in order to prepare him for a big date.

Monica blabs her suspicions when she mistakenly believes Joey is infatuated with Phoebe.

Joey realizes his intense feelings for Rachel are excluding Ross from the joys of impending fatherhood.

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.

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

Raj moves in with Leonard and Penny and a period of adjustment begins for the three, while usually self-centered Sheldon shows surprising interest in Amy's work.

Sheldon is working overtime and pushing himself when he collaborates on projects with Leonard and Howard, and another one with Amy, all on the same day. Bernadette's maternity leave is running out and she must face going back to work.

Leaving baby Halley in day care proves to be tough for Bernadette after she starts back to work, and geologist Bert digs up a girlfriend, but some of his colleagues think she's a gold digger.

Penny's job offer from a former boyfriend doesn't sit well with Leonard.

On the Season 10 finale, Sheldon's former admirer, Dr. Ramona Nowitzki, turns up while Amy is visiting Princeton, and the gang is extremely concerned.

Season 11 begins with Amy giving Sheldon an answer to his marriage proposal. Meanwhile, Howard and Bernadette struggle with some unexpected news.

Leonard angers the university and the entire physics community when he gives an embarrassing radio interview. Meanwhile, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.

Financial fraudster Will Ferrell hires Kevin Hart to 'coach' him on prison life as his sentence approaches in this comedy.

Based on a true story, a group of steroid-abusing bodybuilders engage in a campaign of kidnapping, extortion and murder in Florida.

Based on a true story, a group of steroid-abusing bodybuilders engage in a campaign of kidnapping, extortion and murder in Florida.

An award-winning model and her MMA fighter husband take on the world in tonight's episode. Can they go the distance against a pair of noisy lovers, early retirees and the most fabulous 40-year-olds on the planet?

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.

After the death of his father, T'Challa, the King of Wakanda, returns home to the isolated, technologically advanced African nation to succeed to the throne and take his rightful place as king.

Two salesmen, Wheeler and Danny, trash a company truck on an energy drink-fueled bender. Upon their arrest, the court gives them a choice: do hard time or spend 150 service hours with a mentorship program.

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.

Roger feels unappreciated during Christmas so Snot introduces him to Judaism. After a run-in with Santa, Roger really gets into the Hanukkah spirit.

After Stan's plan for the perfect Christmas goes terribly, tragically wrong, he's given a magical opportunity to make things right.

When Roger has his famous Christmas sex party stolen from him the results are... monstrous. Stan creates a magazine for men.

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

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.

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.

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

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

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.

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

Ross' new girlfriend orders Christmas cards with a photo of them on the cover.

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

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

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.

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

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.

On Christmas Eve, Amy plans a traditional Victorian dinner, while Raj, Leonard and Howard scramble to remove a pigeon that flew into the clean room at the university.

Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.

Our bravest competitors are still fighting for $25,000. Nurses, a paramedic and some marines try to prove that not all heroes wear capes, but they all die.

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.

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.

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.

Monica fears Chandler has a sexual fetish involving sharks.

Famished Phoebe waits for tardy friends to arrive at her birthday dinner.

Ross ridicules Rachel's choice of a male nanny.

Chandler and Joey find a videotape while checking out Richard's apartment. Ross sings Emma an off-color lullaby.

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.

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

Leonard, Sheldon and Wolowitz celebrate the successful completion of their top-secret military project, until an unpleasant surprise leaves their heads spinning. Amy considers an offer of a summer position as a visiting researcher.

Season 11 begins with Amy giving Sheldon an answer to his marriage proposal. Meanwhile, Howard and Bernadette struggle with some unexpected news.

Leonard angers the university and the entire physics community when he gives an embarrassing radio interview. Meanwhile, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.

Amy records Sheldon talking in his sleep and tries to convince him that he has a more laid-back side. Meanwhile, Raj and Stuart compete to win the heart of Bernadette's new co-worker.

Wolowitz and Sheldon bond over their relationships with their disappointing fathers when they drive to the desert to shoot off a model rocket. Leonard's mom finds a new best friend in Penny, much to Leonard's dismay.

Sheldon and Raj confide in Bernadette when they can't handle Amy and Howard working together. Penny and Leonard learn new tactics on how to deal with Sheldon and they come from an unlikely source.

Sheldon goes head-to-head with Wil Wheaton for the role of the new Professor Proton. Penny steps in and takes care of Halley when Bernadette and Howard both wind up on bed rest.

Sheldon and Bert collaborate on a research project, despite Sheldon's embarrassment. Penny and Bernadette coach Koothrappali on how to navigate his relationship with Ruchi.

Leonard and Howard are furious after they learn Sheldon went to work with the military behind their backs. Bernadette is on bed rest, and she asks Raj to do some digging when she suspects Ruchi is trying to steal her job.

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

Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Raj "breaks up" with Howard after realizing his best friend is actually hurting his confidence.

Sheldon and Howard plan birthday celebrations for Amy and Halley, respectively. Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.

Stan goes to the past to keep Jane Fonda from ruining Christmas, but he winds up creating an alternate future where the United States has been taken over by the Soviet Union.

After Stan comes home from another dangerous mission, he finds that his family has decked the halls with boughs of holly and donned themselves with gay apparel, but just not to his satisfaction.

The Rapture happens on Christmas Eve, and Stan is left behind.

Stan gives Steve a gun for Christmas, even though Francine warns him that Steve is too young. As usual, Stan ignores her, and when Steve accidentally shoots Santa, he sends the North Pole into a tizzy and jeopardizes Christmas.

Father Donovan holds a Christmas play at the mall and casts Stan as Santa Claus and Roger as Jesus. After they get in a fight and cause a scene, Stan is kicked out of the church. Hayley and Jeff adopt a child who turns out to be possessed.

When Steve starts acting like a spoiled brat during the holidays, Stan takes him to see his Grandpa Jack, who tells him the story of how he caught a legendary demon who punishes naughty children on Christmas.

When Stan wishes he could have Principal Lewis' carefree, single life, his wish comes true! Meanwhile, in his wish world, Principal Lewis has Stan's family.

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.

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.

Roger feels unappreciated during Christmas so Snot introduces him to Judaism. After a run-in with Santa, Roger really gets into the Hanukkah spirit.

After Stan's plan for the perfect Christmas goes terribly, tragically wrong, he's given a magical opportunity to make things right.

When Roger has his famous Christmas sex party stolen from him the results are... monstrous. Stan creates a magazine for men.

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

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

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.

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.

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

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

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.

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

Ross' new girlfriend orders Christmas cards with a photo of them on the cover.

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

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

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.

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

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.

On Christmas Eve, Amy plans a traditional Victorian dinner, while Raj, Leonard and Howard scramble to remove a pigeon that flew into the clean room at the university.

Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

Ralphie Parker spends most of his time dodging a bully and dreaming of his ideal Christmas gift, a Red Ryder BB gun. Frequently at odds with his dad but comforted by his mom, Ralphie struggles to make it to Christmas Day with his glasses and hopes intact.

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.

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.

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.

To discover who would be most qualified to be best man and maid of honor at their wedding, Sheldon and Amy subject their friends to a series of secret experiments. Also, Penny reveals her true feelings about Amy.

When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Bert replaces Howard in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.

Raj 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.

When Bernadette won't go in labor, all her friends try different tactics to get things started. Howard confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.

Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy. Bernadette and Howard have a hard time deciding who should stay 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 her pharmaceutical company. Leonard, Raj and Howard do everything in their power to meet him, while Sheldon thinks he is the victim of an April Fools' prank.

When Leonard learns Sheldon is the president of the tenants association, he decides to run against him. Bernadette encourages Howard and Raj to find the owner of a drone after they find it in the backyard.

Reclusive scientist, Doctor Wolcott, invites Sheldon to his cabin in the middle of nowhere, and Leonard, Raj and Howard go along. Penny and Bernadette improvise after Amy doesn't like the tame bachelorette party they planned for her.

Sheldon's comic book store experience changes when writer Neil Gaiman puts Stuart's store on the map. Raj takes credit for Penny's astronomical discovery, and friendships are threatened.

Sheldon goes to Vegas to win money for science. Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.

When Sheldon learns that his mother won't attend his wedding unless he invites his brother, George, he and Leonard travel to Texas to end a family feud. The Wolowitz kids inadvertently infest Amy, Bernadette, Howard and Raj with pinkeye.

In the Season 11 finale, when Amy's parents and Sheldon's family arrive for the wedding, everybody is focused on making sure all goes according to plan -- everyone except the bride and groom.

Sheldon and Amy's honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy's parents, Mr. and Mrs. Fowler. Raj insults physicist Neil deGrasse Tyson and starts a twitter war.

A romantically challenged morning show producer is in for a rude awakening when her bosses team her with a hardcore TV personality who promises to spill the ugly truth on what makes men and women tick.

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.

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.

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.

Sheldon and Amy drive themselves crazy trying to figure out what "perfect gift" Leonard and Penny gave them for their wedding. Raj decides he wants to settle down and asks his father to arrange a marriage for him.

Howard's life gets complicated when Stuart starts bringing his new girlfriend home. Penny and Leonard talk about starting a family while Raj explores an arranged marriage.

Amy doesn't have time to work on a project, so Sheldon goes to great lengths to ensure she can work with him even if it means sabotaging her career in the process. Raj doesn't want Howard to join him in hosting a show at the planetarium.

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.

Leonard is caught between a rock and a hard place when he's responsible for distributing extra grant money. Bernadette turns the backyard playhouse into a hideaway from her husband and kids.

Sheldon tries to bond with Amy's father, but when Howard lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Raj and Anu try to get physical for the first time.

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.

An expedition to a mythical island finds the place crawling with prehistoric dangers, led by the giant ape, King Kong.

An expedition to a mythical island finds the place crawling with prehistoric dangers, led by the giant ape, King Kong.

Our bravest competitors are still fighting for $25,000. Nurses, a paramedic and some marines try to prove that not all heroes wear capes, but they all die.

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

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

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

The six friends say goodbye and embark on the next chapters of their lives.

The six friends say goodbye and embark on the next chapters of their lives.

Three embittered former high-school buddies get a chance to relive the past when a magical hot tub at a ski resort sends them back to 1986.

After a disastrous blind date, single parents Lauren and Jim agree on only one thing: they never want to see each other again. When they sign up separately for a family vacation, they're stuck sharing a suite at an African safari resort.

Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend, so Leonard takes matters into his own hands. Bernadette and Penny take out Raj's fiance, Anu, for dinner to get the skinny on her.

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-fianc?e, 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."

After a disastrous blind date, single parents Lauren and Jim agree on only one thing: they never want to see each other again. When they sign up separately for a family vacation, they're stuck sharing a suite at an African safari resort.

After Rachel leaves her fiance at the altar, she moves in with Monica and finds that independence is not so easy, particularly without Daddy's credit cards.

Ross is stunned to learn his ex-wife is pregnant with their child. Monica's dinner for her overly critical parents is a disaster.

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.

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.

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.

It's raining singles. Everyone for themselves! We've got the Fastest Person on the Course, a Business Bro who's afraid of coins and Jimmy the Polyglot who knows how to say "$25,000 Dollars" in 12 different languages.

Two LAPD lawmen take on Chinese gangsters running a slave labor ring.

Sheldon refuses to eat solid food after a choking scare.

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.

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.

Phoebe's twin sister causes confusion and conflict. Ross attends childbirth classes with his ex-wife and her girlfriend.

Rachel and Monica squabble over two handsome doctors. Ross ponders his impending fatherhood with his own father.

The women lose money in a poker game with the men. After getting advice from a champion card player, they demand a rematch.

Rachel accidentally lets Ross' pet monkey escape, and the friends form a search party. Rachel learns that her former best friend is engaged to marry Rachel's former fianc?.

Rachel reunites with her duplicitous ex-fiance. Chandler agonizes about a woman who doesn't call him after the first date.

Monica meets a woman who helps her live out her fantasies. Ross' pet monkey becomes sexually mature and makes everyone crazy.

Monica finds out more than she wants to know about her latest love. Chandler's friends at work treat him differently since his promotion. Ross' ex-wife begins giving birth.

When Carol gives birth, Ross and Susan almost miss the event. Joey befriends an unmarried pregnant woman.

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.

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.

Roger announces Max Jets, a character of Roger's who enjoys showering the Smith family with money, is getting out of prison. A wrench is thrown in the system when Max falls in love with Gina, a gold-digging waitress.

Roger pretends to be Jeff's imaginary friend so he can roam naked around the house with no disguise. When Jeff figures out Roger is an alien, Stan issues an ultimatum, either Roger or Jeff must be killed immediately.

Stan's honeymoon with his wife, Sexpun Tocome, is interrupted when Black Villain shoots Sexpun. Determined to get revenge, Stan teams up with his nemesis to track down Black Villain and stop his evil plan to melt the arctic glaciers.

Francine pressures Steve to win the National Spelling Bee so he can get into a top college. Stan and Roger try to slam Hayley through the five stages of grief so she will get over Jeff faster.

Francine discovers she has a spanking fetish; Hayley goes out on a date with Snot.

When Stan loses his memory, Francine attempts to transform him into the perfect husband; Roger joins Steve's newspaper route.

Stan learns that the CIA wants to wipe out Bullock's memory after he exhibits signs of dementia; Roger hires Stelio Kontos to deal with a student who's bullying Steve at school.

In order to return to Earth, the space-bound Jeff must convince an emperor that he is in love with Hayley.

Klaus swaps bodies with Stan after discovering that his original human body is on ice at the CIA; after converting the attic into a gym, Roger attempts to convince Stan to sign up for a lifetime membership.

Our bravest competitors are still fighting for $25,000. Nurses, a paramedic and some marines try to prove that not all heroes wear capes, but they all die.

It's raining singles. Everyone for themselves! We've got the Fastest Person on the Course, a Business Bro who's afraid of coins and Jimmy the Polyglot who knows how to say "$25,000 Dollars" in 12 different languages.

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.

After the death of his father, T'Challa, the King of Wakanda, returns home to the isolated, technologically advanced African nation to succeed to the throne and take his rightful place as king.

As the Avengers and their allies continue to protect the world from threats too large for any one hero, a new danger emerges: Thanos, who threatens the fate of Earth and life itself.

The grave course of events set in motion by Thanos that wiped out half the universe and fractured the Avengers ranks compels the remaining Avengers to take one final stand.

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.

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.

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.

Ross spends some quality time with Marcel, his former pet monkey. Chandler gets a big surprise from a sexy former classmate.

Monica's old home video shows Ross' true feelings for Rachel. Joey gives a gaudy gift to Chandler.

Ross and Rachel encounter obstacles to romance. Monica becomes enamored with a handsome, older doctor.

Monica's parents find out about her middle-aged boyfriend. Chandler and Joey argue and it could mean the end of their living arrangement.

Joey wants to move back in with Chandler, but there's a new problem. Phoebe tapes a rock video. Ross upsets Monica.

As the Avengers and their allies continue to protect the world from threats too large for any one hero, a new danger emerges: Thanos, who threatens the fate of Earth and life itself.

The grave course of events set in motion by Thanos that wiped out half the universe and fractured the Avengers ranks compels the remaining Avengers to take one final stand.

After a terrible accident, Dr. Stephen Strange loses his ability to operate but finds new purpose when a mystical being known as the Ancient One reveals that Dr. Strange is the newly designated Sorcerer Supreme.