The Roses search for their missing son, David, while Alexis takes her relationship with Mutt to the next level despite technically being engaged to Ted.

Abby enlists Dan on a quest to find a girl's letter to Santa, Gurgs' gift for Dan isn't what she expected, and a witness believes herself to be the Ghost of Christmas Present.

Jim, a recently divorced dad, has a mishap with his daughter’s beloved pet goldfish and must begrudgingly seek the help of his ex-wife and her new boyfriend.

Charlie ends up having to go to one of Evelyn's firm get togethers but the event ends up giving the two a friendship. However, Evelyn is one step ahead of Charlie when he becomes interested in one of her clients.

Alan convinces Charlie that he needs to date more respectable women and sets him up with a judge called Linda. The two double date but things don't go too well.

Bonnie is furious when Christy's poor financial decisions threaten the family's living situation.

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

Christy and Bonnie rent a house with a colorful past.

Carl's bro-mance with Mike is in jeopardy.

Mike's mom dashes his plans for romance.

Mike comes on to strong after a weekend with Molly.

When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.

Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.

Although the Thanksgiving meal is great, Chandler is still moody and Ross is depressed. To cheer them up the group reminisce about their worst Thanksgivings and Monica's worst memory is revealed.

Joey starts to get uneasy protecting Monica and Chandler's secret. Ross becomes enraged at work when someone swipes his turkey sandwich. Rachel attends one of Phoebe's literature classes but doesn't take it seriously.

Rachel has second thoughts about Danny when she observes his uncomfortably close relationship with his sister. Chandler and Ross have a fight over Joey writing his own play and Phoebe gets a job as a donation collector.

As 1999 approaches, the group all make resolutions most of which will require a lot of willpower. Rachel vows to stop gossiping, a resolution put to the test when she learns about Monica and Chandler's relationship.

Bonnie is furious when Christy's poor financial decisions threaten the family's living situation.

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

Christy and Bonnie rent a house with a colorful past.

Carl's bro-mance with Mike is in jeopardy.

Mike's mom dashes his plans for romance.

When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.

Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.

Although the Thanksgiving meal is great, Chandler is still moody and Ross is depressed. To cheer them up the group reminisce about their worst Thanksgivings and Monica's worst memory is revealed.

Joey starts to get uneasy protecting Monica and Chandler's secret. Ross becomes enraged at work when someone swipes his turkey sandwich. Rachel attends one of Phoebe's literature classes but doesn't take it seriously.

Rachel has second thoughts about Danny when she observes his uncomfortably close relationship with his sister. Chandler and Ross have a fight over Joey writing his own play and Phoebe gets a job as a donation collector.

As 1999 approaches, the group all make resolutions most of which will require a lot of willpower. Rachel vows to stop gossiping, a resolution put to the test when she learns about Monica and Chandler's relationship.

Bonnie goes job-hunting while Christy figures out Violet.

Christy has mixed feelings about Baxter's new relationship.

Christy & Bonnie are lavished in luxury while helping Jill.

Molly insists that Mike spend the night at her place.

Molly becomes jealous when another woman flirts with Mike.

Molly is guilted into hosting Thanksgiving by Mike's mom.

Leonard and Amy help Sheldon cope with the shame he’s feeling after his accidental contribution to science is disproved. Meanwhile, Raj must stay with Howard and Bernadette for a week.

While Sheldon is in Texas, the rest of the gang realizes how much he has changed their lives as they decorate the apartment Christmas tree.

When Penny’s big acting break on NCIS is a bust, Leonard struggles to help her, which results in Penny asking Leonard a bold relationship question. Meanwhile, Sheldon tries to learn how to be funny.

Monica hangs out with Chandler and his co-workers and learns Chandler has a second, more annoying personality when he's around his boss. Ross learns Emily is getting remarried and in grief hooks up with an old nemesis.

When Joey decides to change his image in order to land an acting gig, Rachel offers to help by hooking him up with the latest fashions. Meanwhile, Phoebe's grandmother passes away and she plans for the funeral.

When the friends learn Ugly Naked Guy is moving out of his apartment, Ross leaps at the chance to get his own place. Phoebe finds out about Monica and Chandler's relationship and tries to get them to reveal the truth.

Joey starts dating Katie, a little girl who packs a mean punch. When Ross refuses to contribute to the retirement fund of the building's maintenance man he ends up offending everyone in the building.

Deacon and Allison make an enemy of Kethan and commit to a life on the run. As Esme and Alfie both grow suspicious of their behaviour, Allison takes the pregnancy test that will reveal if it's all been for nothing.

Charlie & Linda get closer to consummating their relationship but Charlie has trouble focusing when he begins to see Rose's face everywhere he turns. Charlie ends up flying to London to find out if Rose is still there.

Charlie discovers that he's good with kids while babysitting Linda's four-year-old son Brandon. Meanwhile, the extreme financial hardship at Chez Harper leads Alan to become a guinea pig for medical products.

Abby enlists Dan on a quest to find a girl's letter to Santa, Gurgs' gift for Dan isn't what she expected, and a witness believes herself to be the Ghost of Christmas Present.

Jim, a recently divorced dad, has a mishap with his daughter’s beloved pet goldfish and must begrudgingly seek the help of his ex-wife and her new boyfriend.

Annie, Will, Fran, and Emily spend a weekend at the Oregon coast, and Annie and Fran reminisce about the early days of their friendship.