NBC Comedy Vault

Karen moves her wedding to Las Vegas, where Jennifer Lopez agrees to sing at the ceremony.

Karen moves her wedding to Las Vegas, where Jennifer Lopez agrees to sing at the ceremony.

Karen recruits Jack to help her get Jennifer Lopez to listen to Karen's new song; Grace takes out her frustration over her cheating husband on Will.

Jack wangles his way into Janet Jackson's (guest starring as herself) performance tour as a backup dancer.

As she attempts to steal doughnuts at an AA meeting, Grace has a surprise reunion with Val (Molly Shannon); Will and Jack attend a gay television focus group meeting.

Grace accuses Will of being too nice to strangers; Jack has trouble at his new company when his co-workers mock him about his Cher doll.

Despite the fact that Will has never had a happy birthday, his new relationship with Vince (Bobby Cannavale) gives him hope that this one will be.

Will convinces Jack to aid a local gay-bookstore owner to save his store from closing.

Will and Grace decide to invite Vince and Nadine (Kristin Davis) over, but they quickly learn that, despite similarities in friendship, they are polar opposites.

After a great date with someone else, Grace comes home to a garbled message from Leo; Karen and Jack try to set each other up, but things go awry.

Will, Grace, Jack and Karen go on a road trip for Grace's getaway weekend, but Jack and Karen hate the car ride and bail on the plan.

Vince's mother cannot make her traditional holiday feast, so Will volunteers to make a special meal, but Vince's mother refuses to give him any credit; Jack gives Vince's sister (Jamie-Lynn DiScala) pointers on keeping secrets.

Vince's mother is unable to make her traditional holiday feast, so Will volunteers to make a special meal, but Vince's mother refuses to give Will any of the credit; Jack gives Vince's sister (Jamie-Lynn DiScala) pointers on keeping secrets.

Grace accidentally breaks a treasured figurine at Will's mother's (Blythe Danner) holiday party and blames it on another guest.

An old classmate (Jeff Goldblum) tries to get revenge on Karen by becoming the president of Walker Inc.; Will and Grace run into Vince and a co-worker while playing hooky from work.

Will is reluctant to bring Vince to a dinner party at his boss's (Lily Tomlin) home, fearing it will scratch his chances of making partner at the firm.

When Scott Woolley (Jeff Goldblum) tries to get Grace to fire Karen by impersonating a restaurant owner, the women plan a trap for him.

Although Grace tries to ignore St. Valentine's Day, she winds up with a hunky greeting-card writer (Ed Burns); Karen's former nemesis (Jeff Goldblum) tries to win her heart by showering her with gifts.

Grace drags Will along on her first date with Nick (Edward Burns); Karen tries to set Jack up on a date with the neighborhood bird enthusiast (Luke Perry), but things don't quite go as she has planned.

When Will agrees to fire Karen's pastry chef, he becomes involved in a love triangle that the baker created.

When Jack convinces Will that they need a change of scenery, they buy an apartment in an up-and-coming gay community.