Will, a gay lawyer, and interior designer Grace have been best friends since college. Living in the same apartment complex, they're constantly in each other's business. Stirring the pot of melodrama is Grace's `employee', Karen, and Will's flamboyant friend, Jack.
Season four begins as Jack gets acquainted with his newfound son, and Will and Grace's friendship causes rifts with Nathan. (S4, ep 1)
Will's childhood nemesis joins the firm and resumes his old reign of terror. Meanwhile, Nathan's birthday sparks rivalry between Grace and Karen. (S4, ep 2)
Jack enlists Grace's help for his son's junior high dance. Plus, Karen learns a lesson about the boy who cried wolf. (S4, ep 3)
Grace moves into Karen's apartment and becomes hooked on the extravagant lifestyle. Meanwhile, Will attends an acting class with Jack. (S4, ep 4)
Jack plays devious matchmaker when he sets his female supervisor up with Will who, incidentally, is desperate to model for her catalogue. (S4, ep 5)
Nathan pops the question but it's hardly the fairy tale Grace envisioned. Elsewhere, Will attempts to educate his more morally challenged friends. (S4, ep 6)
Grace is in a bedridden pit of despair after losing Nathan. Will her friends' well-meaning remedies help things or just make them a whole lot worse? (S4, ep 7)
There's a political palaver when Will and Grace end up backing opposing candidates simply because they're gay and Jewish respectively. (S4, ep 8)
Moveable Feast - Part 1: Will, Grace, Jack and Karen team up for a whirlwind Thanksgiving tour, taking a pit stop at each other's respective family homes. (S4, ep 9)
Moveable Feast - Part 2: Will, Grace, Jack and Karen's Thanksgiving tour continues as the gang pay visits to the remaining family homes. (S4, ep 10)
Grace foolishly asks Karen for financial advice, while Jack tries to cement a new catchphrase and Will spots a familiar face... (S4, ep 11)
Will meets a ballet dancer but is too embarrassed to introduce him to the gang, and Jack is let loose decorating a Barney's store window. (S4, ep 12)
Grace's plot to dispense of Will's father's awful mistress falls at the last hurdle, while Jack and Karen's horse-breeding scheme is doomed from the start. (S4, ep 13)
Grace rekindles an old flame during a visit to Stan's prison, and, for a bet, Karen and Jack attempt to spend three days solely in each other's company. (S4, ep 14)
Dying is Easy, Comedy is Hard: Grace puts her foot in it at her ex-fiance's rehearsal dinner, and Jack lands himself in serious bother when he allows Elliot to dye his hair. (S4, ep 15)
There's romantic plots aplenty as Karen tries to pass Will off as her partner, and Jack uses Grace as date-bait to gain a place in the Manhattan Gay Men's Chorus. (S4, ep 16)
Someone Old, Someplace New - Part 1: Will and Grace embark on some underhand dealings to fund their dream flat. Jack uncovers a big secret. (S4, ep 17)
Something Borrowed, Someone's Due - Part 2: Will and Grace pine for the comforts of their old flat, while Jack attempts to reconcile Karen and her wayward mother. (S4, ep 18)
Will buys his newly reconciled parents an exotic cruise to celebrate their anniversary, but is unaware that both are harbouring a secret... (S4, ep 19)
Will salvages a gnome from his parents' house as a relic from his youth, but it soon comes to an unsavoury end. Plus, Jack has an acting dilemma. (S4, ep 20)
Jack enlists Will's help when he has to work during a father/son basketball game, while Grace makes for a less than perfect teacher. (S4, ep 21)
Grace helps Will plan his friend's wedding but gets a little too caught up in the excitement, and Will and Karen bond over a raunchy book. (S4, ep 22)
Grace faces more stress at the hands of her neighbour, and when Will's laptop is stolen he meets a police detective with a special interest in his case. (S4, ep 23)
Will sends Grace to pose for a notoriously eccentric photographer but doesn't get the result he expected, and Jack regrets asking Karen to be his assistant. (S4, ep 24)
A Buncha White Chicks Sittin' Around: Will asks Grace to be the biological mother of his child, Jack auditions for a Broadway musical and Karen faces up to a conjugal visit. (S4, ep 25)
A.I. Artificial Insemination - Part 1: Will and Grace's attempts to have a baby prove increasingly fruitless, while Jack is having doubts about his career - until he meets Cher. (S4, ep 26)
A.I. Artificial Insemination - Part 2: Season finale. Will and Grace's baby dilemma leads to a misunderstanding, and Karen becomes romantically tempted by a wealthy suitor. (S4, ep 27)