Will hires a cleaning lady to "rescue" his designing roommate Grace from the creative chaos that litters their apartment, and while preparing for an annual decorators' contest, Grace develops a dependency on her maid and can't create without her. Meanwhile, Jack poses as an attorney in Will's office to impress an attractive guy he hopes to date.

Will is stunned to discover that Grace is dating her ex-fiance Danny once again, but he chooses not to interfere after he's accused of being meddlesome. Meanwhile, Jack agrees to take a walk down the aisle with Karen's combative maid, Rosario, who needs a groom to help her smooth out some immigration problems.

When Grace feels that Will is abusing his power as president of the tenant's association, she runs against him. Karen tries to buy back Jack's forgiveness when she lets his beloved bird, Guapo, fly out the window.

Erotic dreams about Grace send Will to a therapist, who seems more interested in Grace. Meanwhile Jack and Karen clash over her treatment of Rosario.

While on a blind date, Will finds out that Karen's husband Stan has had a heart attack and rushes to the hospital to be with the gang. Will, Jack, Grace, and Rosario all speculate on who Karen will turn to for her inevitable emotional breakdown. After all, who will pay the bills if Stan dies?

Terrified after someone breaks into her apartment, Grace stays with Will. Unfortunately, having both her and Jack under one roof is driving Will crazy and he forces them to choose which one will move out; Jack and Karen are still at odds over his divorce from Rosario.

When they are asked to read at the civil union of two friends, Will and Grace verbally spar over her self-serving, get-and-take attitude where Will is responsible for everything -- but what's really bugging him is the overwhelming feeling that Grace is behaving more like a wife than an old friend. Meanwhile, Karen tries to help a caffeine-addicted Jack get over a failed crush but he's so jacked-up on java that only a tough-love approach will work.

Grace is smitten when she meets Sumner, Karen's charming and handsome nephew, but Grace's attempts to arrange a date are constantly thwarted when Karen conjures up a litany of lies to dissuade her. Meanwhile, Will tries to terminate his dead-end relationship with a needy nebbish, but postpones the dramatic moment because he's so infatuated with the guy's lovable doggie, Pepper.

Jack is puffed up with paternal pride as he escorts his long-lost teenaged son Elliot to a junior high school dance but not before he coerces Grace into posing as Elliot's date – which only revives her own tortured memories of rejection from school dances many years before. Elsewhere, Karen has great fun at her lawyer Will's expense when she continues to capriciously summon him for bogus ""emergencies"" – that is, until she really needs him.

Will & Grace try to lure Tina, Will's dad's mistress, away from Will's father by setting her up with another man. Unfortunately the only man available is Will's gay friend, Larry. Also, Karen buys a horse for breeding, but the stud is more interested in stallions.

After Will and Grace move into their expansive new dream apartment, they discover the awful pangs of separation anxiety as they pine for their smaller old digs now happily occupied by their friends who sub-let the place. Elsewhere, Jack tries to reconcile Karen with her estranged grifter of a mom, who wants to recruit her daughter for her next caper.

After Will and Grace decide to have a baby together, obstacles pile up before them, including a missing specimen sample and bungled insemination efforts that have them teetering between artificial and natural means – all leading to mis-conceptions. Meanwhile, when Jack considers giving up his show-business aspirations, until he gets some career advice from a ""divine"" entity – his idol, Cher. Likewise, married Karen is sorely tempted by the romantic tickling of a rich and natty gentleman.

A dazed Grace is rescued by a handsome Jewish doctor who pulls her up on his horse and delivers her just in time for her insemination with an impatient Will. But their new relationship as expectant parents puts a strain on Will and Grace's relationship when they agree not to date until their baby is born. Meanwhile, a restless Karen can't make up her mind about cheating on her imprisoned husband with the genteel but ardent suitor Lionel.

On Christmas Eve, Grace is torn when she has only two tickets to ""The Nutcracker"" and can't take both her best friend Will and new husband Leo, but her back-and-forth indecision leaves Will spinning like a Hanukkah dreidel between a dithering Grace and his previous holiday plans with Jack and Karen.

In the middle of her divorce proceedings, Karen learns that ex-husband Stan has suddenly passed away, and the funeral becomes a contest of wills between Karen and her British rival, and a free-for-all when the will is read for everyone who ever felt deserving, such as Will. Meanwhile, Grace is shocked when recently returned husband Leo is called back into service by Doctors Without Borders and asks her to make the trip with him to Guatemala.

Will and Jack awake in a precarious position - sharing a bed in the nude - while at sea. Unable to remember every detail from the night before, the two alleged bedfellows deny the possibility that anything happened, but each grow concerned as to how to dump the other. Meanwhile, Grace's discovery of a love letter in Leo's bag from a female colleague prompts her to doubt his fidelity and Karen survives a night fighting for her life while afloat in the forbidding night sea and a freighter full of russian sailors, and must honor a pact with savior Rosario.

Dynamic enterprisers Will and Grace begin a new business venture as they buy old apartments to refurbish and re-sell for a tidy profit. When budding ""student nurse"" Jack bumps into his former acting mentor Zandra, the pair of entrepreneurs finds their first project apartment. Meanwhile, Karen renews her romance with Lyle Finster, but the couple's bliss is interrupted by an unfortunate houseguest when Lorraine moves in.

Responding to the pleas of his father's mistress-turned-girlfriend Tina, Will attempts to discover whether there is a new woman in his dad's life. However, when his father's new mistress turns out to be his mother, Will must find a way to break the shocking truth to Tina. Meanwhile, Elliot's decision to try out for his high school cheerleading squad has Jack all smiles as he is determined to help his son make the team.