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When Janice asks the gang if any of them have ever slept together, the friends flash back to three years earlier.

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

Adrift in space with no food or water, Tony Stark sends a message to Pepper Potts as his oxygen supply starts to dwindle. Meanwhile, the remaining Avengers -- Thor, Black Widow, Captain America and Bruce Banner -- must figure out a way to bring back their vanquished allies for an epic showdown with Thanos, the evil demigod who decimated the planet and the universe.

Soldiers and civilians travel to the year 2051 to join a global war against a deadly alien species.

Soldiers and civilians travel to the year 2051 to join a global war against a deadly alien species.

The Jokers are back playing lawyers, trying to convince unsuspecting focus group participants to sign off on ridiculous terms and conditions before they go in. Then they put their family businesses to the test by asking strangers if their radio ad is good to stay on the air. Later, one joker will be getting revenge in an elaborate punishment that the other two are really going to feel.

Bilbo Baggins (Martin Freeman) lives a simple life with his fellow hobbits in the shire, until the wizard Gandalf (Ian McKellen) arrives and convinces him to join a group of dwarves on a quest to reclaim the kingdom of Erebor. The journey takes Bilbo on a path through treacherous lands swarming with orcs, goblins and other dangers, not the least of which is an encounter with Gollum (Andy Serkis) a

Chandler is devastated after Joey tells him he saw Janice kissing her ex-husband; Monica accidentally bumps Ben's head into a post when she and Rachel babysit; Phoebe is paranoid if she goes to dentist someone she knows will die.

Emotions become the feast of the day when the gang plays a game of touch football on Thanksgiving; the turkey is left stewing when the losing team calls for a rematch.

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

Ross is suspicious about Rachel's possible job offer from a good-looking stranger (Steven Eckholdt); Chandler can't remember which of Joey's many sisters he kissed at a party.

Ross becomes jealous when he hears Rachel's new co-worker (Steven Eckholdt) whispering sweet nothings to her.

Running into Richard at the video store tests Monica's willpower; Joey agrees to read "Little Women.".

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 can't communicate with her new boyfriend, a UN diplomat who doesn't speak English; Ross seeks solace at a party after a bitter fight with Rachel.

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

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

Phoebe's brother wants to marry a woman twice his age; Monica gets a huge tip from an admirer.

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

Monica's aunt dies and leaves her an antique dollhouse that she doesn't want Phoebe to play with; Rachel regrets making a date for Chandler and her boss, Joanna; Joey's interest in Kate intensifies.

Monica considers accepting a dream job in Pete's new restaurant but fears there is more to the deal; Ross makes a sacrifice for Rachel.

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

The Jokers' mothers visit as overprotective parents meeting a Joker's girlfriend; a Joker must convince a stranger to pose as his girlfriend for a Broadway outing with his mother.

The Jokers are back playing lawyers, trying to convince unsuspecting focus group participants to sign off on ridiculous terms and conditions before they go in. Then they put their family businesses to the test by asking strangers if their radio ad is good to stay on the air. Later, one joker will be getting revenge in an elaborate punishment that the other two are really going to feel.

Two days before his wedding, Doug (Justin Bartha) and three friends (Bradley Cooper, Ed Helms, Zach Galifianakis) drive to Las Vegas for a wild and memorable stag party. In fact, when the three groomsmen wake up the next morning, they can't remember a thing; nor can they find Doug. With little time to spare, the three hazy pals try to re-trace their steps and find Doug so they can get him back to

Two years after the disastrous events in Las Vegas, it is now Stu's (Ed Helms) turn to walk down the aisle. Since his bride is from Thailand, Stu decides to hold the wedding there. Desperately hoping to avoid the mayhem of Doug's (Justin Bartha) bachelor party, Stu chooses what he thinks will be a safe option: an alcohol-free, prewedding brunch. But this being Thailand, and with Phil (Bradley Coop

It's been two years since the gang known as the Wolfpack narrowly escaped disaster in Bangkok. Now, Phil (Bradley Cooper), Stu (Ed Helms) and Doug (Justin Bartha) have happy lives at home -- but Alan (Zach Galifianakis) doesn't. Still lacking contentment and a sense of purpose, Alan has gone off his meds and surrendered to his natural impulses. It's up to the other members of the Wolfpack to get h

Kripke has proof that Dr. Pemberton plagiarized his thesis in college, and Sheldon and Amy aren't sure if they should turn him in or not; Wolowitz learns that Bernadette 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.

Sheldon and Amy await big news.

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

Leonard is happy to meet new neighbor Penny, but his roommate thinks he is chasing an impossible dream.

Leonard volunteers to sign for a package, hoping to make a good impression on Penny.

Unhappy to learn that Penny is seeing someone, Leonard summons the courage to ask another woman on a date.

Two days before his wedding, Doug (Justin Bartha) and three friends (Bradley Cooper, Ed Helms, Zach Galifianakis) drive to Las Vegas for a wild and memorable stag party. In fact, when the three groomsmen wake up the next morning, they can't remember a thing; nor can they find Doug. With little time to spare, the three hazy pals try to re-trace their steps and find Doug so they can get him back to

Two years after the disastrous events in Las Vegas, it is now Stu's (Ed Helms) turn to walk down the aisle. Since his bride is from Thailand, Stu decides to hold the wedding there. Desperately hoping to avoid the mayhem of Doug's (Justin Bartha) bachelor party, Stu chooses what he thinks will be a safe option: an alcohol-free, prewedding brunch. But this being Thailand, and with Phil (Bradley Coop

It's been two years since the gang known as the Wolfpack narrowly escaped disaster in Bangkok. Now, Phil (Bradley Cooper), Stu (Ed Helms) and Doug (Justin Bartha) have happy lives at home -- but Alan (Zach Galifianakis) doesn't. Still lacking contentment and a sense of purpose, Alan has gone off his meds and surrendered to his natural impulses. It's up to the other members of the Wolfpack to get h

Eddie gets himself in trouble when he defends Steve from a bully.

Eddie places image over integrity in his class-president bid.

As the church congregation gossips about Georgie, Missy stands up for her brother; Sheldon is distracted by the family drama.

Sheldon struggles to cope with his first signs of puberty; Mary and George Sr. both hunt for new jobs; Georgie and Meemaw take a business trip across the border.

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

Sheldon and Missy try to help the family's finances; 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; Mary is jealous of Missy's relationship with Mandy and MeeMaw.

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

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

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

Ross dates Rachel again after unwittingly agreeing to take responsibility for their breakup; Phoebe reconciles with her mother; Monica is stung by a jellyfish.

Phoebe becomes convinced that the spirit of her dead mother is inside a cat; Chandler and Joey are robbed; Monica goes on a date with a guy from her high school.

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

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

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

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

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

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

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

Getting fired gives Sheldon the opportunity to explore life beyond physics, but when he spends his time weaving ponchos and acting like a shut-in, Leonard calls Sheldon's mother for assistance.

Leonard, realizing his pursuit of Penny is fruitless, has an unexpected encounter with a fellow scientist (Sara Gilbert).

Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.

Penny sleeps on Leonard and Sheldon's couch when Wolowitz seduces her friend and takes over her apartment; in need of a fourth member, the guys ask Penny to join their "Halo" team.

On a blind date, Koothrappali discovers that he can talk to the opposite sex after a few drinks, but his date takes an interest in Sheldon.

Penny tries to mediate when Sheldon and Leonard disagree on whether to present their joint findings at a physics conference.

Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing, but the elaborate lie Sheldon tells leads to an unexpected result.

Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.

Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.

When Sheldon tries to prove his mental superiority as they train for the Physics Bowl, the guys kick him off the team and bring his nemesis (Sara Gilbert) aboard.

Leonard and the guys buy a time machine prop from a classic movie; Penny tells the guys their obsession with comics and toys is pathetic.

Leonard devises a plan to eliminate his rivals when he, Wolowitz and Koothrappali all fall for Sheldon's twin sister, but his plan backfires when Sheldon decides to choose who his sister dates.