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

Ross's lesbian ex-wife, Carol, is pregnant with his child, and he doesn't like her choice of last name for the baby. Rachel finds out that her ex-fiancé went on what would have been their honeymoon with her maid of honor.

Monica and Ross mourn the death of their grandmother with a little help from the gang, and Monica and her mom come to an unspoken understanding about the relationship between mothers and daughters. Meanwhile, Chandler is irritated by office speculation that he is gay.

Joey falls for Phoebe's twin sister, Ursula, making Phoebe feel neglected. Ross has doubts about parenthood when he attends Lamaze classes with Carol and Susan. Meanwhile, Chandler finds himself between a rock and a hard place, when he is told to fire an employee he is attracted to.

When Rachel sprains her ankle and has no insurance, she cajoles Monica into trading identities so she can use Monica's coverage. When Phoebe's twin sister, Ursula, breaks Joey's heart, Phoebe tries to fix it.

As Monica's biological clock ticks away like a time bomb, Carol goes into labor. Ross, Susan and Phoebe end up getting locked in a closet just as Carol's about to give birth to the baby. And Rachel flirts with an OB/GYN.

Ross enlists Joey and Chandler to help with his decision to choose Julie or Rachel by making a list of the pros and cons of each. Big mistake. Meanwhile, Monica gets a job making food with a synthetic chocolate substitute called Mockolate.

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

Ross tries to prevent Rachel from learning his disturbing secret. She finds out anyway and they go back to her apartment to have a fight. The other four friends are trapped in Monica's bedroom, forced to listen in.

Phoebe is rushed to the hospital for the birth of her brother's triplets. While there, Joey winds up with severe sympathy pains that turn out to be kidney stones. Meanwhile, Rachel tries to set Monica up on a date with a male nurse.

Barry and Mindy's impending divorce prompts the gang to fantasize about what their lives might be like if they'd all taken different courses. Ross is still married to Carol, and Rachel is married to Barry, but fawning over famous soap star Joey Tribbiani. Monica is still fat and dating a doctor. Chandler is an aspiring writer and Phoebe is a Wall Street shark for Merrill Lynch. The gang continue to fantasize about how different their lives could have been. Carol and Ross decide to have a threesome to spice up their marriage. Rachel goes to Joey's but is incredibly nervous about cheating and gets drunk. Meanwhile, Monica's dinner date falls through and Chandler tries to cheer her up but things take an unexpected turn.

The gang celebrate Monica and Chandler's engagement. Phoebe wants to be the musician at the wedding and comes up with a new song, while Joey tries to dress and act like a 19-year-old for an audition. Ross and Rachel briefly reunite and after Monica catches them kissing, she's convinced that Rachel is trying to steal her thunder.

So close to the wedding, Chandler suddenly realizes the overwhelming meaning of getting married and takes off without warning anyone. Meanwhile, Joey acts opposite a famous actor in a movie, but can't bring himself to tell him that he spits when he says his lines. Phoebe and Ross try to find Chandler before the wedding starts, while Rachel tries to hinder Monica, so that she doesn't find out the shocking news. On the day of the wedding Joey encounters a scheduling problem, while Phoebe and Rachel come across a surprising discovery.

The excitement of Monica and Chandler's wedding is diminished by the news that someone may be pregnant. Chandler's hopes of not embarrassing Monica on the dance floor are ruined by his slippery new shoes, and Ross' attempts to flirt with an attractive wedding guest.

Ross and Rachel go to the hospital to have their baby, but it's a long labor. They get stuck in a semi-private room, and many other couples come and go before Rachel is ready to deliver - the last couple being Janice and her new husband. Meanwhile, Chandler and Monica decide to start trying to have a baby, but can't find an empty hospital room where they wouldn't be disturbed. Also, Phoebe meets a handsome stranger and "recruits" Dr. Drake Ramoray to gather some personal information about him.

After Rachel gives birth to her little baby girl, she must confront relationship issues around her. So does Ross, who gets an engagement ring from his mother, while she urges him to propose to Rachel. The things, however, take an interesting turn.

Ross and Rachel hire a nanny for Emma named Sandy and things seem to be going great. However, Ross is uncomfortable having a male nanny. Meanwhile, Chandler becomes upset when Monica says that somebody from her new job is the funniest guy she's ever met. Also, after Phoebe and Mike decide to take their relationship to a new level and exchange apartment keys, Phoebe gets a surprise visit from her ex-boyfriend David.

The gang heads down to Barbados for the paleontology conference. While Ross and Charlie are excited about attending multiple seminars, the rest of the gang just want to enjoy their time on the beach but the rainy weather prevents them from doing so. Things, however, are far from boring - Phoebe discovers that she still has feelings for Mike even though she enjoys spending time with David, Rachel feels lonely and struggles to keep her feelings about Joey to herself, and Chandler is amused by Monica's hair.

Joey is a celebrity contestant on "The $100,000 Pyramid," with its actual host, Donny Osmond. Meanwhile, Phoebe's bachelorette party features a rather unexpected surprise when the stripper shows up. Also, Chandler and Ross attend a college reunion and flash back to 1987 to reflect on a pact they made when they were in college.

After Rachel makes a startling announcement about her possibly accepting a new job offer in Paris, Ross secretly schemes to get her former job back at Ralph Lauren. Joey is so flustered by all of the upheaval in his friends' lives that Phoebe prevents him from learning about the sudden death of his agent Estelle. Meanwhile, Monica and Chandler check out the house for sale next door to their new suburban home and make a stunning discovery.

Erica goes into labor and the new parents, Monica and Chandler, get a bit more than they bargained for. Meanwhile, Joey gets them a housewarming gift - Chick Jr. and Duck Jr., who unfortunately get trapped inside the foosball table. Also, after their night together, Ross realizes that he's still in love with Rachel and doesn't want her to leave. Other friends convince him to go after her and Phoebe races Ross to the airport in a bid to stop Rachel from leaving for Paris.

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