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.

Matt Damon makes a guest appearance as a clever charmer named Owen, who's competing against Jack for a spot in New York's Gay Men's Chorus. Truth be told, however, Owen is totally straight and is really after the group's big perk: a summer trip to Europe, all-expenses paid. Jack suspects Owen's ruse but needs proof. How about the hug test? Now a flustered Jack reluctantly turns to Grace to ""in"" Owen. Meanwhile, a scheming Karen tries to pass off an unwitting Will as her lover and not her lawyer when she discovers that she's the object of pity for being single at her own Valentine's Day party

Will finds a guy that he's interested in.

When Grace and Leo join Karen for a friendly game of tennis at her exclusive club, her fierce playing style sends Grace fleeing the court. However, when the reason for her angry play is her hatred for Leo, Grace is determined to find a way for them to get along. Elsewhere, a nervous Will suckers Jack into visiting his depressed mother in Connecticut hoping they can cheer her up.

Opting to forgo a picturesque fall wedding to elope in Las Vegas, Karen hops a plane to ""Sin City"" with fiance Lyle and faithful friends Will and Jack but when she bumps into vacationing superstar Jennifer Lopez, she asks J-Lo 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.

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.

Grace tries to ignore the greeting card holiday but romantic urges eventually send her into the arms of the enemy -- none other than Nick, a hunky greeting card writer. In a dramatic change of events, Karen's former nemesis Scott Wooley tries to win her heart by showering her with gifts but Karen's eyes are on larger things -- her new overweight internet date. Elsewhere, after dancing with a lesbian couple Will and Jack find comfort in each other's arms for the Valentine's Day spotlight dance.

Having quit his job at the law firm, Will turns to a career in writing where he catches the eye of Malcolm, who claims to have high-profile connections -- but when his writing career fails, Malcolm has another job offer for Will. Meanwhile, Tom, an old flame from college, returns to ask Grace to design a hotel that he and his wife just bought -- only to discover that there are still romantic feelings between the two of them. Jack struggles to produce his latest show for OutTV, but spoiled child star Randall fails to embody Jack's vision. Under threat of a lawsuit, Karen is forced to publicly apologize to Beverly for an embarrassing rumor.

When Jack decides on a whim to move, Will is excited at the thought of helping him look for a place. While attending Beverley's wife's memorial “celebration,” Karen and Grace experience a wardrobe malfunction, which they must try to conceal.

Karen celebrates her birthday with some of New York's crème de la crème, but the festivities turn sour when she ends up crammed in the bathroom with Grace, Will and Jack, who have all embarrassed themselves at the party.

An ecstatic Jack coerces Will into coming out with him to a gay cowboy bar to meet his new boyfriend Travis. Will soon discovers that Travis is not as perfect as he seems and steps up to defend Jack's honor, which eventually leads to a bar fight.

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.