Will and Jack can't wait to arrive at the house of two old friends who are known for their wild parties but they discover that the former party animals are now sedately raising an adopted baby girl -- and Will shocks Jack when he volunteers to test his shaky parenting skills by babysitting her for them. Elsewhere at a snooty yacht club, Grace believes that Karen is jealous of her romantic relationship with Ben but then later regrets taunting her.

Grace dispatches Will to sell her dearly departed uncle's jalopy but after he makes the sale to an enterprising nun, a guilty Grace changes her mind and wants to buy it back -- but the sister makes it clear that, short of a miracle, it's going to cost her plenty. Elsewhere, Karen must duel with an equally eccentric rich friend for the housecleaning services of Rosario while Jack suddenly sees the world differently when he believes his missing father is African-American.

Grace hates herself for her fatal attraction to Nathan and wants to keep her embarrassing romance with him a secret. Likewise, Will prefers to maintain discretion in his relationship with a much younger man. Meanwhile, Jack revels in the attention lavished on him by Grace's eccentric friend, Val.

In a sneaky ploy to bum a night off from work at Barney's department store, a conniving Jack plays matchmaker and takes advantage of his geeky female supervisor's interest in Will, while mindful of Will's fantasy of modeling in the store's catalogue. Jack parlays their mutual desires into a "date", even though his unsuspecting friend doesn't have a clue of her intentions. Elsewhere, Grace goes where no woman should when she compares her previous sexual experience with her boyfriend Nathan's.

Rather than be apart on Thanksgiving Day, Will and Grace join Jack and Karen for a festive holiday motor tour of their respective dysfunctional families, including Grace's domineering mother as well as Will's willful mom and Jack's stepdad -- with unsettling results. Meanwhile, back home, a waiting Rosario bastes and tastes their juicy turkey.

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)

While Will and Grace are feuding, Karen and Jack hatch a wobbly plan to patch up their differences about co-parenting a baby by tricking each one into attending the same child's birthday party. After arguing over who brought the better gift, the feathers continue to fly as the best friends fuss over their conflicting agendas.

Karen looks for a place to live, and succeeds in finding an apartment with a gal named Liz. Liz turns to be just as self-important and skanky as Karen, so it's a perfect match. Meanwhile, Grace and Jack are concerned about Will when he gets injured and relies heavily on painkillers.

Karen, Will, Jack, and Grace go on a trip in Karen's yacht to sprinkle Stan's ashes into the Caribbean while Leo is flying to Guatamala with an atractive co-worker. While Karen sprinkles Stan's ashes she finds Lorraine has been stowing on board. While Karen and Loraiinne fight, Will and Jack get drunk. Lorainne pushes Karen off the board and Rosairo jumps off after her. The next morning Grace finds Leo's bag with a letter from his co-worker Danni saying that she wants Leo. Will wakes up in bed naked with a hangover and a naked Jack in the bed with him. Meanwhile Karen and Rosairo are stuck on a cargo boat.

Opting out of the annual Grace Adler Design Christmas party, ultimate ""Fanilow"" Will spends the night waiting in line for tickets to a special Barry Manilow concert only to have his weak bladder force him to make a quick pit stop and entrust Grace to hold his place. However, Will's snubbing of an overweight man in the bathroom line leaves his chances of meeting his idol in doubt. Meanwhile, a distraught Grace discovers her mother has cancelled on their annual Hanukkah shopping spree to have dinner with Jack. And Karen is embraced by the inspiring music of Manilow waiting in line with a Fanilow named Cheryl.

Opting to forego a picturesque fall wedding and elope in Las Vegas, Karen hops a plane to ""Sin City"" with fiance Lyle and faithful friends Will and Jack. After arriving, they bump into superstar Jennifer Lopez who is vacationing and agrees on behalf of Rosario to sing at the ceremony. Meanwhile, Leo returns from Cambodia to meet up with Grace at the wedding, but their reunion is delayed by a freak design accident.