David agrees to sub in for the annual baseball game, and Moira runs a rehearsal that pushes Stevie over the edge.

After being upstaged by Second Wife at Transcience Fest, things go from bad to worse: a shock eviction leaves the band without a rehearsal space. But a chance lifeline leads them down an unexpected path.

Ted and John’s plan to exact revenge on the school bully inadvertently puts them in a parental role. Matty agrees to get a colonoscopy… on one condition.

Still pretending to be the poverty-stricken "Sam Wilson", Walden spends Christmas with Kate. Meanwhile, Walden & Billy close a deal to sell their electronic suitcase for $1.2 billion. Elsewhere, Alan's Christmas goes south when all his loved ones have other commitments.

Walden wants to invest in his girlfriend Kate's fashion career, without her discovering that he is billionaire Walden Schmidt rather than broke "Sam Wilson", as he's led her to believe. What is more, the stress of the deception is beginning to affect Walden's health.

Christy pretends she's fine, although her family's homeless.

Christy and Bonnie rent a house with a colorful past.

Bonnie goes job-hunting while Christy figures out Violet.

Business booms for Max and Caroline's new cupcake walk-up window when word spreads about a shocking incident involving a rock star.

Caroline tries to raise money for an expensive pair of new pants through an online fundraising site. Meanwhile, Max's obsession with her new Smartphone starts to come between her and Caroline.

When Max becomes smitten with an old stray cat that's been hanging around the apartment, Caroline persuades her they need to find it a better home. After a long search, they are convinced they've found the desired ''good home'', but then the cat's fate takes a turn.

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.

Penny's home business turns into a complete nightmare when Sheldon takes over.

Penny squares off with a new beautiful female neighbor who may become the building's 'new Penny'.

At the beach, Phoebe meets a family friend with links to her past; Ross discovers Rachel still loves him; strip poker leaves Joey naked; Chandler wonders why Monica doesn't think he's serious when he asks her out.

Ross chooses between Rachel and his girlfriend Bonnie. Phoebe struggles with the revelation of her mother's friend being her real mother. Monica gets stung by a jellyfish, forcing Chandler and Joey to relieve her pain.

Phoebe believes her adoptive mother's spirit resides in a cat that jumped into her guitar case in Central Perk. Monica goes on a date with Rachel's hunky high-school boyfriend and Joey takes stupidity to a new level.

Monica caters a party for her mother who still doesn't know how to talk to her daughter. Chandler's encounter with Rachel's boss leads to an embarrassing situation and an encyclopaedia salesman takes advantage of Joey.

Christy pretends she's fine, although her family's homeless.

Christy and Bonnie rent a house with a colorful past.

Bonnie goes job-hunting while Christy figures out Violet.

Business booms for Max and Caroline's new cupcake walk-up window when word spreads about a shocking incident involving a rock star.

Caroline tries to raise money for an expensive pair of new pants through an online fundraising site. Meanwhile, Max's obsession with her new Smartphone starts to come between her and Caroline.

When Max becomes smitten with an old stray cat that's been hanging around the apartment, Caroline persuades her they need to find it a better home. After a long search, they are convinced they've found the desired ''good home'', but then the cat's fate takes a turn.

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.

Penny's home business turns into a complete nightmare when Sheldon takes over.

Penny squares off with a new beautiful female neighbor who may become the building's 'new Penny'.

Ross chooses between Rachel and his girlfriend Bonnie. Phoebe struggles with the revelation of her mother's friend being her real mother. Monica gets stung by a jellyfish, forcing Chandler and Joey to relieve her pain.

Phoebe believes her adoptive mother's spirit resides in a cat that jumped into her guitar case in Central Perk. Monica goes on a date with Rachel's hunky high-school boyfriend and Joey takes stupidity to a new level.

Monica caters a party for her mother who still doesn't know how to talk to her daughter. Chandler's encounter with Rachel's boss leads to an embarrassing situation and an encyclopaedia salesman takes advantage of Joey.

Christy has mixed feelings about Baxter's new relationship.

Christy & Bonnie are lavished in luxury while helping Jill.

Christy attempts to right the wrongs of her past.

Max and Caroline can't figure out how to use the new cappuccino maker they have bought for their cupcake business, so they decide to take temporary side jobs at a local coffee house in order to learn the ways of the mystifying machine.

A ''Cronut'' is a half donut/half croissant hybrid, and they are proving very popular, so popular in fact that they are causing Max and Caroline to rapidly lose business. They decide it's time to come up with their own new trend, and that's when ''cake fries'' are born.

Caroline is feeling guilty, so buys a new bedding set for Max. Not realising Max's old pillowcase holds sentimental value for her, Caroline donates it to charity, forcing the pair of them on a mission to recover the cherished piece of bedding.

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

Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas. Sheldon becomes locked out of his apartment so must stay with Penny.

Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.

Joey attempts ballroom dancing in order to help Monica and Rachel keep their illegal sublet. Phoebe is attracted to one of her massage clients and Chandler has trouble attempting to quit a gym.

Chandler hits on a woman at Central Perk, not realising she's Joey's new girlfriend. Ross and Rachel play the jealousy game in their relationships & Phoebe tries to catch a cold to make her voice and singing more sexy.

Ross's new girlfriend seems nearly perfect, until he discovers her apartment is incredibly dirty. Chandler helps Joey pick out a thoughtful present for Kathy's birthday whilst Phoebe helps Monica cater a funeral.

Chandler must decide between the girl of his dreams and his best friend when he and Kathy share a kiss. Needless to say Joey is not happy to find out and nobody wants to tell Ross how awful his keyboard playing is.

Rachel returns to the church, where arranged marriage is making a comeback.

David teaches Rachel to drive - which goes about as well as you'd expect.

Fed up with his double-life and feeling that Kate might be the one, Walden decides he should throw away his "Sam Wilson" alias and confess to who he really is. Kate's in New York at a fashion show, so Walden, accompanied by Alan, set off to tell her the truth in person.

Lyndsey's miffed that she doesn't have a key to the beach house. Meanwhile, Walden, Alan, Billy and Herb share stories about women.

Johnny and Moira's afternoon plans are interrupted when they accidentally hit a cat. David runs into an old colleague at the flea market whose new business bears a striking resemblance to Rose Apothecary.