The gang, minus Phoebe and Rachel, travels to London to prepare for Ross' wedding. While in London, Chandler gets annoyed with Joey's overexcited antics, and Monica tries to give advice to Emily. Arriving in London, Joey and Chandler go sightseeing but Joey’s overly enthusiastic behavior compels Chandler to go off on his own. Back in New York, Rachel realizes her feelings for Ross are stronger than ever and rushes off to the airport as wedding time nears.

Phoebe is tired of being pregnant and experiencing major mood swings. Ross chooses Joey as his best man, so Joey begins planning a bachelor party (complete with strippers) while the girls decide to throw Phoebe a baby shower.

Ross and Emily discuss who to invite to their wedding. He wants to invite Rachel while Emily thinks it's odd. Ross sends her an invitation anyway. The gang receives their invitations, all except for Chandler, as they reminisce about Ross and Rachel's up-and-down relationship. However, a very pregnant Phoebe can't go. Rachel wrestles with the idea of going to the wedding and after deciding against it, breaks down and cries on Monica's shoulder.

A snoring Joey is keeping Chandler awake, forcing Chandler to take him to a sleep clinic. Ross asks Monica to pick up Emily's wedding dress for him, and Monica decides to try it on for a bit.

Monica and Rachel are tired of their new apartment. Ross wants Emily to stay as she prepares to leave again. Phoebe is wearing "Santa" pants. Monica and Rachel try to bribe Joey and Chandler into giving up their apartment for Knicks tickets.

A very pregnant Phoebe is asked to name one of the triplets. Emily offers to show Susan around London. Rachel tries to prepare the perfect evening for herself and Joshua.

Chandler and Joey find an unscrambled porn channel on their TV and refuse to turn it off for fear of losing it. Meanwhile, Phoebe receives some surprising news and Monica helps Ross come to a decision regarding Emily.

With two days left until Emily's departure back to England, Rachel throws a fake party for her, just so that she can see Joshua outside of work. And a pregnant (vegetarian) Phoebe craves meat.

Ross takes on a rugby challenge from some old friends of Emily's from England in order to impress Emily. Meanwhile, Chandler runs into Janice and tries to avoid restarting his relationship with her.

After a three-day fishing trip with his dad, Joey is in a jam when he doesn't have time to take a shower before going to the set of Charlton Heston's new movie. Rachel, continuing to fawn over clothing shopper Joshua, sets Ross up with her boss's niece when she is unable to take her to the opera. Ross ends up spending a weekend in Vermont with the niece, Emily. And while Chandler is despondent after his breakup with Kathy, the girls take him to a strip club.

Chandler can't deal with the fact that Kathy simulates sex, half-naked, in a play, with a very handsome man. After Rachel is demoted to personal shopper, she is in a hard place after she discovers that she likes a customer, but he won't ask her out. And Monica wants to play hostess again after telling Joey that since he now has the bigger apartment, he must constantly have company over.

Joey and Chandler guess all the items that Monica and Rachel had in a bag after coming home from the market. This starts a competition between the boys and the girls, a question-answer game created by Ross. The team that knows the most about the other one wins. Meanwhile, Phoebe goes to the doctor to get the embryos implanted in her uterus.

Phoebe considers her options when her brother visits with his new wife and asks her to carry their child. Joey works as a tour guide at Ross's museum and tries to tear down the walls between tour guides and scientists. And Chandler seeks advice from Monica and Rachel after he fears that he will not live up to Kathy's sexual expectations--especially since the last guy she slept with before him was Joey.

Ross must decide whether to continue dating a girl he must travel two-and-a-half hours to see. Chandler sets Rachel up with a coworker who misunderstands her intentions. Monica is being treated poorly by her new coworkers so she hires Joey just so she can fire him and show who's the boss. And Phoebe tries to write the perfect holiday song.

Chandler and Ross's college friend Gandalf is planning to come to town. Gandalf is "the party wizard." Ross and Chandler are very excited until Gandalf cancels. However, they decide to make their own party with Joey's help. Joanna squashes Rachel's chance at a promotion. And when Monica fills in for a friend as food critic for a small newspaper, she must decide between a steady job as head chef of a restaurant she panned or keeping her catering business with her friend Phoebe.

Chandler agrees to spend Thanksgiving in a shipping crate as penance for kissing Kathy. The gang decides to give each other Secret Santa gifts. After Monica gets ice in her eye, she ends up visiting Richard's son, who is as attracted to Monica as his father was.

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

Ross's new girlfriend seems nearly perfect until he visits her house and discovers that her apartment is incredibly dirty. Chandler helps Joey pick out a thoughtful present for Kathy's birthday. Rachel attempts to finish a crossword puzzle by herself. And Phoebe helps Monica cater a funeral.

Chandler hits on a woman at Central Perk, not realizing she is Joey's new girlfriend. He soon realizes he is very attracted to, possibly in love, with her. Ross and Rachel play the jealousy game in their relationships. And Phoebe desperately tries to catch a cold after discovering that her voice is sexier and her singing better when she has phlegm in her throat.

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.

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

Phoebe believes that 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, who was cool in high-school, but a failure now. And when Joey and Chandler decide to sell the entertainment center, Joey takes stupidity to a new level.

Ross chooses between Rachel and his bald-headed girlfriend Bonnie. Phoebe struggles to deal with the revelation that her mother's friend is actually her mother. Monica gets stung by a jellyfish, forcing Chandler and Joey to step up to the plate in order to relieve her pain.