Grace brings Will for support when she goes home to celebrate her deceased mother's birthday. Jack's faith in love is crushed after breaking up with Drew and uncovering a secret in Karen's marriage.

Jack realizes he lost 13 gold coins he's supposed to give Estefan at their wedding to avoid a curse. Will is concerned that Grace is the only one compromising in her relationship with Noah. Karen shows up at a dinner party with her new date, Nikki.

Will, Grace, Karen, and Jack wish they could have experienced Christmas in old New York City, but realize the past was not quite as romantic or open to diversity as they pictured it.

Will claims living with Grace is like Ricky living with Lucy; when Karen and Jack hear this, they each claim that they are the Lucy of the group; Grace, Karen and Jack each imagine themselves as Lucy, with Will as the Ricky to all of them.

Will and Grace try to convince themselves they are okay with dating the same man; Jack and Karen get an annoying commercial jingle stuck in their heads and must seek medical attention.

Despite her history of transgressions, Grace and her neighbor, James, decide to give their relationship one more shot. But when James invites Grace to his job at the aquarium, she endangers his job and a species. In order to help Will deal with his anxiety about becoming a father, Jack takes him to an unexpected place to blow off steam – church. Karen finds herself in a confessional booth, and a visit from Smitty makes her reconsider their entire relationship.

Will and Jack try to date younger guys but find it challenging. Grace and Karen experience a crisis that reveals Grace's true feelings about Karen.

We pick up with Will, Grace, Jack, and Karen 11 years since we last saw them. Will and Grace both falter when their political beliefs are put to the test. Jack and Karen help Will and Grace hide their secret shame from each other, but the truth finally comes out.

Grace is shocked to find that the emergency contact called by her doctor's office is ex-husband Leo, not Will. Jack takes on a new job he never expected to love. Karen befriends a 12-year-old girl in the Bronx, despite her best efforts.

Grace tries for her biggest job yet: decorating a string of boutique hotels for an obnoxious mogul. Will is surprised at his reaction to making Senior Partner. Beverly Leslie discloses his secret to Karen. Jack owns half of a winning lottery ticket.

Grace is horrified to realize that she's dated three men from the same family. Will and Karen get on each other's nerves at the office until they bond over watching -- and producing -- their own little telenovela.

Grace's father and Will's mother end up making a surprising and upsetting connection. Jack rebounds from his breakup with a new love. Karen must decide between her husband and her lover.

When Will discovers Noah has a child, he promises to keep the secret from Grace; Karen and Jack's relationship is tested when she fires him from the play she's producing and replaces him with Jon Cryer.

Will convinces Grace that her boyfriend, Noah, isn't in the wrong by refusing to let her meet his daughter, Katie. When Grace goes to apologize to Noah, she unintentionally meets Katie. Meanwhile, Will's mom, Marilyn, visits after the death of her beloved dog, and becomes upset when she doesn't get the emotional support she expects from her son. And Jack gets into an argument with his rec center boss, Theo.

Will and Grace's plan to win over Will's new Columbia department head goes awry when he drops dead in their apartment - and they use his phone to text his full recommendation of Will. Karen and Estefan's dislike for each other puts Jack in full damage control mode when he must keep them separate at his birthday dinner.

Malcolm enlists Grace to help him win back Karen's affections. Will's flirtation at work lands him in an ethical dilemma. Jack's passion for performing is reignited by a chance encounter with Zusanna, the sister of his former acting teacher.

Jack's insistence that Will be nicer to his fiancé, Estefan, backfires when Estefan thinks Will is in love with him. In a hurry to buy her boyfriend Noah a Valentine's Day gift, Grace unknowingly knocks over a prominent figure while going after a taxi. And when Karen discovers that Noah not only writes her favorite romance novels but also plans to kill off the main character, she forces him to rewrite the story.

Will and Grace get competitive over whose process of having a baby is more difficult. Jack helps Karen prove to Danley Walker that she'll be a competent owner of her new baseball team. But Karen realizes that an old acquaintance, Amy, may be the help she really needs.

Grace and her neighbor, James give their romance another shot – even after she slept with his son and his father. But an embarrassing incident puts Grace’s relationship, and her dignity, in jeopardy. Will decides it’s time for Jack to grow up, and cuts him off financially. But unlikely wisdom from Jack’s husband, Estefan, makes Will reconsider.

Will and Grace decide to intervene when they discover Grace’s niece is dating a bisexual man. Jack gets permission from his husband, Estefan, to sleep with his celebrity hall pass, Ryan Phillippe. Karen struggles to adapt when her assistant, Friday, books them on an economy flight.

When Will's surrogate, Jenny, tells Will their relationship needs boundaries, Will ropes newly-out Dr. DiLorenzo into going on a fake date so he can spy on Jenny. Unsure if having a boy or girl is more difficult, Grace struggles with popping her gender reveal balloon. During her baseball team's championship game, Karen is torn between celebrating with Friday, and helping Jack build his confidence for a Broadway audition.

Karen celebrates her baseball team's championship. Will and Grace go to an open house, which leads to a conversation about their future living arrangement. Jack has to decide if he wants to stay in the city to pursue his dreams.

Grace's accidental run-in with Noah, a curmudgeonly man she follows on Twitter, hints at a possible new love interest. Jack wants to look younger before meeting Estefan's family on Skype but makes a terrible first impression after overdoing the numbing cream before his facial procedure. Meanwhile, Will helps Karen protect the intellectual property rights of her most prized possession.

When Will discovers Karen's estranged stepdaughter Olivia is a student in his law class, he attempts to solve their issues with a mock trial. Grace and Jack go on a diet together, but giving up their eating habits proves harder than anticipated.

When both of their boyfriends ask to move in, Will and Grace use each other as an excuse to get out of it. A snowstorm traps Karen at the office and Jack in an elevator, where he reunites with old flame Drew and tests his commitment to monogamy.