When Grace receives an unexpected marriage proposal from her boyfriend, Will tries to be supportive of her decision but finally tells her that she's making a mistake, even though he's putting their friendship at risk. The situation is complicated by interference from Grace's socialite assistant, Karen, and Will's outrageous friend, Jack.

Will must decide whether to support Grace's independence by encouraging her to take an apartment across town or selfishly keep her close by inviting her to share his living space. The decision may be made easier, however, by the nagging presence of Will's current roommate, Jack, and his parrot, Guapo. Meanwhile, Karen and Jack meet for the first time and find each other to be fabulous.

When Grace moves in with Will, she complains that the guest bathroom is too small and suggests knocking the common wall down to create one big master bathroom, which results in Will having to confront his own issues on change and his ability to have a successful relationship. Meanwhile, Jack and Karen bear the brunt of Will and Grace's displaced anger.

When Grace decorates Harlin's apartment, she gets carried away with a cowboy theme. Will is both shocked and embarrassed by the cowboy chic and makes an even greater mess of the situation. Meanwhile, Jack decides to embark on a “singing career“ with a little help from Karen.

After Grace defies Will's wishes and brings home a puppy, Will can't resist the pooch and begins to treat him like a newborn baby. Meanwhile, Jack and Karen worry about the dog's effect on Will and Grace and insist that the new parents go out for a night on the town.

A "surprise" birthday party for Jack astounds Will when his estranged older brother Sam turns up at the fete at Grace's invitation. Not only do sparks fly between the brothers, but electricity of a different sort crackles between Grace and Sam. Meanwhile, Karen flashes her platinum card for Jack as the pair shop until they drop at a boutique where the snooty salesmen previously had snubbed Jack.

A wary Grace tells Will of her romance with his brother, Sam, and unleashes an avalanche of resentment. While Will wrestles with sibling rivalry, Karen helps Jack come to grips with turning 30 by hiring him as her personal assistant and leads Grace to sort through her true feelings for the Trumans.

Despite her moving out (to across the hall), Will still feels that Grace clings to him, so she asserts her independence by having a dinner party without him. Meanwhile, to keep the INS at bay, Jack is forced to move in with Rosario.

Grace looks to Will for representation when a hotshot lawyer doesn't pay her for a consulting assignment, but he ends up making Will a job offer. Meanwhile, Jack and Karen turn a training film set into an adult entertainment experience.

Will and Jack appear on Today to protest NBC for cutting a gay kiss out of an eagerly-waited sitcom episode. Will is frustrated with Jack on how much he wanted to see that kiss and kisses him. Elsewhere, Grace confides in Karen about dumping her boyfriend.

To help make peace between Grace and Ben, Will has them both over to dinner, only to have their relationship go beyond friendship. But then Will finds out that Ben is dating someone else. Meanwhile Jack catches Rosario in a clinch with a lover and learns that she wants a divorce.

After three months on the island, Will finally returns only to learn that Jack and Grace have bonded in his absence. Meanwhile Grace still can't decide between Josh and Ben; When Karen tries to smuggle pearls in the States, Rosario ends up taking the rap.

Will is torn over ending his newfound relationship with Matt, a rising TV sportcaster who is extremely reluctant to let the world – especially his macho business associates – know about his sexual preference, so he continues to refer to Will as his ""brother."" Meanwhile, as Grace does her best to help Will decide, Karen is livid when she discovers that he helped draft her husband's will, which will award much of his estate to charity.

An exasperated Grace tries to mediate between a resentful Will and her sloppy, free-spirited boyfriend Nathan when Nathan moves in while Jack is in a royal dither as he plans to finally meet his unseen father face-to-face. However, Grace grows nervous when the two polar-opposite men find some common ground and she ponders how a devoted boyfriend might affect her equally important relationship with her longtime buddy Will. After settling his father issues, Jack later gets the surprise of his life in a most unexpected fashion.

An exasperated Grace tries to mediate between a resentful Will and her sloppy, free-spirited boyfriend Nathan when Nathan moves in while Jack is in a royal dither as he plans to finally meet his unseen father face-to-face. However, Grace grows nervous when the two polar-opposite men find some common ground and she ponders how a devoted boyfriend might affect her equally important relationship with her longtime buddy Will. After settling his father issues, Jack later gets the surprise of his life in a most unexpected fashion.

Will returns from vacation to discover that Grace's romantic relationship with neighbor Nathan is humming along. Nathan feels neglected when Will and Grace resume their chummy friendship, complete with their own private language and code. Meanwhile, Jack proudly takes his new-found son Elliot shopping for school at Barney's while Rosario and Karen each cruise the merchandise looking for the perfect "anniversary gift".

When Will hears his ""biological clock"" ticking, he shocks Grace by asking her to become the mother of his baby but when they meet with a therapist, Grace reveals that she's uneasy about the necessary sacrifices – and makes a startling revelation. Inspired by Will's ""seize-the-day"" quest, Jack and Karen are also moved to pursue their goals: for him, it's auditioning for a legitimate Broadway production; for her, it's visiting her imprisoned husband for a dreaded conjugal visit.

The culmination of eight seasons ends tonight with a one-hour series finale - will Will and Grace raise a child together and find ultimate happiness? Will Jack find anyone that loves him as much as he loves himself? Will Karen find true happiness with the absence of Stan? All these questions and more will be answered as this groundbreaking series concludes eight amazing seasons.

The culmination of eight seasons ends tonight with a one-hour series finale - will Will and Grace raise a child together and find ultimate happiness? Will Jack find anyone that loves him as much as he loves himself? Will Karen find true happiness with the absence of Stan? All these questions and more will be answered as this groundbreaking series concludes eight amazing seasons.