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".

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 and Grace elect to disagree when it comes to choosing sides during a mayoral election; she supports the female Jewish candidate and he's voting for the gay nominee. To settle matters, the roomies host fund-raisers attended simultaneously by both aspirants.

This episode is also known as "Thanksgiving." Will and Grace join Jack and Karen in a motor tour of their respective families. (Double-length Episode)

Rosie O'Donnell plays Bonnie, a no-nonsense single mom who clashes with Jack over the raising of their son, Elliot, fathered from Jack's sperm-bank donation. Bonnie's enraged because Jack had 12-year-old Elliot's hair bleached blond, so she lays down the law. ""From now on,"" she tells him, ""stay out of my kid's life. I don't want you to see him again."" A parallel storyline unfolds at a wedding gala, where Will poses as a tennis pro (because nobody likes lawyers); and Grace caustically toasts the bridegroom, her ex-fiancé. ""I've always thought about having a child,"" she says. ""But not as a husband.""

Teaching a design seminar challenges Grace; chaperoning Jack's son occupies Will at the youth's basketball tourney.

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.

Alternately flirty and shy, and acting “incredibly” like a schoolgirl, Karen falls for a suave and sexy restaurateur. The two of them seemed to hit it off on their first date, but then, he hasn't called her in three days. So buttinsky Grace makes it her mission to confront Prince Charming and find out why. Elsewhere, Will and Jack join a gay men's soccer team, and Will, for one, is hardly having a ball. "They were running and kicking and pushing each other down." he says. "It was supposed to be gay sports. Where were the lingering hugs?"

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.

Will, Karen, and a star struck Grace travel to Los Angeles to support Jack as he accepts a HAPI award for Best Local Cable Gay Talk Show Host. Coincidently, Will runs into James while in LA, but to his surprise James is Canadian and in jeopardy of being deported.